How to Fix the WordPress 500 Internal Server Error

Understanding What a 500 Error Actually Means

A 500 error is your server’s way of saying something went wrong during request processing, without disclosing specifics. According to the HTTP specification maintained by W3C, a 500 error signals an unexpected server-side condition that prevented the server from fulfilling a valid request. This intentional vagueness protects your server configuration from attackers who might exploit system details.

Why This Error Demands Immediate Attention

A 500 error means your site is completely offline for all visitors, not just you. Unlike a 404 error (page not found) that affects only specific URLs, or a 403 error (access forbidden) that blocks certain users, a 500 error typically prevents any page on your site from loading. Research on downtime impact demonstrates that every minute of site unavailability costs traffic, potential revenue conversions, and search engine ranking damage.

Beyond the immediate financial impact, downtime erodes visitor trust and confidence in your site’s reliability. Search engines penalize persistent unavailability by deprioritizing your site in rankings. The faster you diagnose and fix the issue, the faster your site returns to serving visitors and generating revenue. Most 500 errors resolve within 15–30 minutes with systematic troubleshooting.

Common Misunderstandings About the 500 Error

Site owners frequently assume a 500 error indicates a hosting provider failure or security breach. While hosting environment resource exhaustion and security compromises do trigger 500 errors in some cases, the vast majority of 500 errors originate within WordPress itself, specifically in plugin incompatibilities, theme conflicts, or corrupted WordPress core files. Hosting-level issues (server crashes, network outages, infrastructure failures) are comparatively rare. Niya Digital’s support team has observed across thousands of cases that approximately 70% of reported 500 errors resolve after isolating and deactivating a faulty plugin or theme, without requiring any hosting-level intervention or infrastructure changes. This statistic underscores the importance of systematic diagnosis: rule out software-level issues before escalating to hosting support.

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Enabling Debugging: Your Fastest Path to Diagnosis

The 500 error message itself provides no actionable information; it’s deliberately generic. To uncover the underlying cause, enable WordPress debugging, which turns that generic message into a specific, detailed error log that points directly to the problem. The good news: WordPress includes built-in debugging functionality that requires no command-line access, no technical expertise beyond editing a text file, and no additional plugins or paid tools. Debugging redirects WordPress error output to a log file instead of displaying errors to visitors, preserving site appearance while collecting diagnostic data.

Enable Debug Logging in wp-config.php

Your site’s wp-config.php file is WordPress’s main configuration file, located in your site’s root directory (the same folder containing wp-content, wp-admin, and wp-includes). According to WordPress.org’s official debugging documentation, you add two simple constants that instruct WordPress to log errors instead of displaying them on the front end. This is the fastest, most direct way to identify the root cause of your 500 error.

Using your hosting control panel’s File Manager or an FTP client, open wp-config.php and locate the line reading /* That’s all, stop editing! */. Immediately above this line, insert:

Save the file. WordPress immediately begins logging all errors, warnings, and notices to a new file at wp-content/debug.log. Refresh your site and attempt to trigger the 500 error again (visit the page that was showing the error, or perform the action that caused it). WordPress records detailed information about what failed. Open wp-content/debug.log in your File Manager and scroll to the bottom to view the most recent entries. You’ll see a message like Fatal error in /wp-content/plugins/plugin-name/file.php on line 42, which directly identifies the faulty plugin and the exact line where execution failed.

Check Your Admin Email for Recovery Mode Alerts

If your WordPress version is 5.2 or later, WordPress automatically detects critical fatal errors and emails your site administrator with a recovery link. This feature, called Recovery Mode, was introduced to prevent administrators from being locked out of their site due to plugin or theme failures. When a fatal error occurs, WordPress sends an email to the address configured in Settings > General > Administration Email Address.

Check your email inbox (including spam and promotions folders) for a message with a subject like “Your Site is Experiencing a Technical Issue” or similar critical alert. The email body names the specific plugin or theme that caused the fatal error and includes a unique recovery link. Clicking this link logs you into WordPress in a special mode that temporarily pauses the broken extension for your user session only, without affecting your site’s public appearance. This lets you safely access your dashboard and decide next steps (deactivate the plugin permanently, update it, or investigate further) without SFTP access or developer help.

Use the Health Check Plugin for Systematic Troubleshooting

If you still have access to your WordPress dashboard despite the 500 error, install the free, official Health Check & Troubleshooting plugin from WordPress.org. This plugin provides a “Troubleshooting Mode” that disables all plugins and activates a default WordPress theme, but only for your user session, leaving your site’s public-facing appearance unchanged for visitors. Once enabled, you can navigate your dashboard normally and re-enable plugins one at a time to identify the one causing the error. This methodical approach isolates the culprit without extensive log file review.

Isolating Plugin and Theme Conflicts

Most WordPress 500 errors stem from plugin or theme conflicts, often triggered by incompatibility with your WordPress version, PHP version, or other installed extensions. These conflicts occur when a plugin calls a function that doesn’t exist, uses PHP syntax incompatible with your server’s PHP version, or tries an operation that requires more memory or execution time than allocated. Isolating the problematic extension is straightforward once you enable debugging or have access to Recovery Mode alerts.

Identifying the Broken Plugin or Theme

When your debug.log contains fatal error messages, they always reference specific files. Review the logs carefully and look for file paths like /wp-content/plugins/plugin-name/ or /wp-content/themes/theme-name/. The file path directly identifies which extension failed. For example, a fatal error in /wp-content/plugins/elementor-pro/index.php indicates the Elementor Pro plugin caused the issue. Similarly, a fatal error in /wp-content/themes/astra/functions.php indicates the Astra theme is responsible.

If multiple error messages appear in your debug.log, prioritize those originating from plugin or theme files over those from WordPress core files. Core file errors (originating in wp-content/plugins/) are rare and usually indicate a corrupted installation rather than a simple conflict. Most 500 errors from plugins occur when a plugin calls a function that doesn’t exist (commonly happens when a plugin requires a newer WordPress version than your site runs), when a plugin uses incompatible PHP syntax (plugins written for PHP 8.0 may break on PHP 7.2), or when a plugin attempts an operation exceeding your server’s memory or execution time limits.

Deactivating and Testing the Suspect Plugin or Theme

Once you’ve identified the problematic extension from your logs or Recovery Mode email, deactivate it to confirm it’s the culprit. If you can access your WordPress dashboard, navigate to Plugins (or Appearance > Themes for themes) and deactivate or delete the extension. If you cannot access the dashboard at all, use your hosting File Manager to rename the plugin’s folder; WordPress won’t load a folder it can’t find. For example, rename /wp-content/plugins/problematic-plugin/ to /wp-content/plugins/problematic-plugin-disabled/. WordPress immediately stops loading that plugin.

Refresh your site homepage. If the 500 error disappears, you’ve confirmed the plugin or theme is responsible. Now you can decide: permanently uninstall the problematic extension, check the plugin developer’s site for an updated version that fixes the issue, find an alternative plugin providing similar functionality, or contact the plugin’s developer to report the incompatibility. Many plugin developers release compatibility fixes quickly once they learn about conflicts.

Fixing a Corrupted .htaccess File

The .htaccess file is a server configuration file that instructs your web server how to handle requests to your site. WordPress uses .htaccess to rewrite URLs, transforming visitor-friendly URLs like yoursite.com/about-us/ into arguments WordPress understands (index.php?page_id=123). When this file becomes corrupted or contains invalid syntax, the web server cannot process the rewrite rules correctly and often returns a 500 error instead of serving pages. Corrupted .htaccess ranks among the most common technical causes of 500 errors, often resulting from plugin conflicts, manual file edits, or malware injection.

Regenerating .htaccess Automatically

The fastest fix for .htaccess corruption is to let WordPress regenerate the file with correct rewrite rules. Log into your WordPress dashboard, navigate to Settings > Permalinks, and click “Save Changes” without modifying any permalink settings. WordPress reads your current permalink configuration and writes a fresh .htaccess file containing the appropriate rewrite rules. Refresh your site; if a corrupted .htaccess file was the culprit, the 500 error disappears immediately.

If you cannot access your dashboard, manually regenerate the file via File Manager. Navigate to your site’s root directory (containing wp-content and wp-admin) and locate the .htaccess file. Files beginning with a dot are hidden by default in most File Managers; enable “Show Hidden Files” in your File Manager settings. Once visible, you’ll see .htaccess in the root directory.

Manual .htaccess Recovery (If You Can’t Access the Dashboard)

Right-click the .htaccess file and select “Rename.” Change the filename to .htaccess_old; this creates a backup, preserving the corrupted version in case you need to reference it later. Next, create a new blank file named .htaccess in the same root directory. Open the new .htaccess file in a text editor and paste the following content, WordPress’s standard rewrite rules:

Save the file. These are WordPress’s default rewrite rules; they handle most WordPress sites. Refresh your site. If a corrupted .htaccess file caused your 500 error, proper URL rewriting is now restored, and your site should resume normal operation. If your site still shows errors after this, move to the next troubleshooting section.

Re-uploading Corrupted WordPress Core Files

Occasionally, WordPress core files in /wp-admin/ or /wp-includes/ become corrupted due to incomplete uploads, malware injection, or server crashes. These files form the foundation of WordPress; if they’re corrupted, core functions fail and return 500 errors. If your debug.log shows fatal errors originating from WordPress core files (messages like Fatal error in /wp-includes/functions.php), corrupted core files are likely responsible. The solution is to re-upload fresh copies from an official WordPress.org download and replace the corrupted versions.

Steps to Replace Core Files Safely

Visit wordpress.org/download/ and download the latest stable WordPress version. Unzip the downloaded file on your computer, you’ll see folders including wp-admin, wp-includes, wp-content, and others. Locate the wp-admin and wp-includes folders. Using your FTP client or hosting File Manager, navigate to your site’s root directory and upload these two folders, selecting “Overwrite Existing Files” when prompted. This replaces any corrupted core files with fresh, official copies from WordPress.org.

The crucial point: uploading fresh wp-admin and wp-includes does not affect your content, settings, users, or plugins. Your wp-content folder (containing all your posts, pages, media, plugins, and themes) remains completely untouched. WordPress core files are separate from content; overwriting core files is a safe, reversible operation. After the upload completes, refresh your site. WordPress automatically verifies file integrity on the next page load. If core file corruption was causing your 500 error, the error resolves immediately.

Verifying the Upload Completed Successfully

After you re-upload the files, WordPress runs automatic verification checks. Refresh your site’s homepage and watch for either:

(1) your site loads normally, indicating the issue is resolved, or

(2) you see a specific error message in your debug.log identifying a different problem. If you still see a 500 error after re-uploading core files, the core files weren’t the culprit; move to the next diagnostic section. Check your debug.log to determine which component is actually failing.

Diagnosing PHP Memory Exhaustion

WordPress and its plugins require memory to load files, process database queries, and manipulate data in memory. When PHP tries an operation that uses more memory than your hosting account’s PHP memory_limit setting, the PHP process terminates immediately and returns a 500 error. Your debug.log will show a message explicitly stating this: Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 491520 bytes). This error message is unambiguous: insufficient PHP memory is the culprit.

Checking Your Current Memory Allocation

To view your current PHP memory limit, log into your WordPress dashboard, navigate to Tools > Site Health, click the Info tab, and scroll to the Server section. Look for the line labeled “PHP memory limit”; this displays your current allocation in megabytes. The WordPress default is often 64M (megabytes), which is insufficient for modern WordPress sites running plugins and processing media. For context: WordPress core requires approximately 64M, but plugins, themes, and media processing can easily push total memory usage to 150M+ during peak operations.

Increasing PHP memory_limit

The simplest method is editing wp-config.php. Add this line immediately above /* That’s all, stop editing! */:

Save the file. WordPress now allocates up to 256 megabytes per request. Return to Tools > Site Health to confirm the change; you should see the new memory_limit displayed. If the 500 error persists, increase the limit further to 512M using the same method. If your hosting provider enforces a server-level maximum memory limit (sometimes the case with shared hosting), you cannot exceed it via wp-config.php. In this scenario, contact your hosting provider’s support team and request an increase to your PHP memory limit. Most hosting providers can increase this limit within minutes.

Resolving PHP Execution Time Limits

Alongside memory limits, PHP enforces execution time limits: the maximum number of seconds a script can run before the server forcibly terminates it. Large operations like bulk imports, WooCommerce order exports, database migrations, or complex theme installations can require 2–5 minutes of PHP execution time. If your server’s default max_execution_time is 30 seconds, these operations time out and return a 500 error. Your debug.log will explicitly state this: “Fatal error: maximum execution time of 30 seconds exceeded”.

Identifying Timeout Errors and Increasing Limits

When your debug.log or server error log shows messages mentioning “maximum execution time exceeded,” identify the operation triggering the timeout (bulk plugin update, large file import, database optimization, etc.). Edit your wp-config.php and add:

This increases the timeout to 300 seconds (5 minutes). Note: this setting in wp-config.php sometimes gets ignored on certain server configurations, particularly those using PHP-FPM or certain managed hosting platforms. If your site continues showing timeout errors, add an alternative directive to .htaccess:

If neither approach works (visible by continued timeout errors in logs), contact your hosting provider and request a server-level increase to max_execution_time. Most hosting providers adjust this within minutes via their control panel. Provide your hosting support with the specific operation triggering the timeout so they understand why the increase is necessary.

Key PHP Settings and Recommended Adjustments

Reading Your Server Error Logs and Debug Files

When systematic troubleshooting doesn’t immediately resolve your 500 error, a detailed review of error logs can provide crucial clues. WordPress writes comprehensive diagnostic information to wp-content/debug.log, and your hosting provider maintains server-level error logs capturing system-level issues WordPress cannot detect.

Where to Find Your Debug Log and Interpreting Error Messages

Your WordPress debug.log file resides at wp-content/debug.log, created when you enable WP_DEBUG_LOG in wp-config.php. Access it via your hosting control panel’s File Manager or FTP.

Open the file in a text editor and scroll to the bottom; the newest errors appear last. Common error messages and their meanings: Fatal error in /wp-content/plugins/… indicates a specific plugin failed (deactivate that plugin); Allowed memory size exhausted indicates insufficient PHP memory (increase memory_limit); Call to undefined function indicates a plugin or theme called a function that doesn’t exist (usually a version compatibility issue); Parse error: syntax error indicates malformed PHP code, usually from a poorly written plugin or malware injection; Segmentation fault or Signal 11 indicates a server-level crash, potentially from resource exhaustion.

Accessing Server Error Logs

Your hosting provider maintains server-level error logs separate from WordPress logs. Log into your hosting control panel (cPanel, Plesk, DirectAdmin, etc.), find the “Error Logs” or “Raw Logs” section location varies by control panel, and review recent entries. Server logs show Apache or Nginx errors, missing PHP modules, server resource exhaustion, and configuration issues that WordPress logs might not capture. If you share your server error log excerpts with your hosting support team, they can quickly identify infrastructure-level issues and advise on solutions.

When to Contact Your Hosting Provider

After exhausting WordPress-level troubleshooting- disabling plugins, regenerating .htaccess, checking PHP settings, and reviewing debug logs- if your site still shows a 500 error, the issue likely originates at your hosting environment. Some problems require hosting provider intervention because they involve server-level configurations you cannot modify yourself.

Signs Your Hosting Provider Needs to Help

Contact hosting support if:

(1) your site shows persistent 500 errors even after disabling all plugins and switching to a default WordPress theme, suggesting a server-level issue;

(2) your server error logs mention “mod_rewrite not enabled” or missing Apache modules; your hosting provider must enable these modules;

(3) logs show “Segmentation fault,” “Out of memory,” or “Resource limit exceeded” errors repeatedly, indicating your account’s resource allocation needs increasing at the infrastructure level;

(4) errors began after upgrading to a new PHP version, suggesting your plugins or theme may be incompatible with the new version; or

(5) errors occur consistently during specific operations (bulk uploads, imports, backups) that consume substantial resources.

What to Share With Your Hosting Support Team

When contacting support, provide:

(1) your complete WordPress debug.log file contents from wp-content/debug.log;

(2) your server error log excerpts from your control panel;

(3) a screenshot of the 500 error message and the exact URL or action triggering it;

(4) details of any recent changes preceding the error (plugin update, WordPress upgrade, theme change, server migration); and

(5) the timeframe when the error began (specific date and time if possible).

This information helps your support team diagnose the issue quickly. Most hosting providers have SLAs that commit to investigating within 1–4 hours, depending on your support plan.

Best Practices to Prevent Future 500 Errors

Prevention is far simpler than troubleshooting. Several proactive habits keep your WordPress site stable and minimize 500 error recurrence.

Keep Plugins, Themes, and WordPress Updated

Most plugin and theme incompatibilities surface immediately after updates when plugins haven’t been tested against new WordPress or PHP versions. Check your WordPress dashboard weekly for available updates and install them promptly. Before updating critical plugins on your live site, test updates in a staging environment first. Many WordPress hosting providers offer complimentary staging sites, or you can create one locally for testing. WordPress.org’s official plugin repository vets plugins for security, but updates can occasionally introduce new bugs; testing on staging catches incompatibilities before they affect your live site. Enable automatic backups through your hosting control panel so you can restore a working version if an update causes problems.

Choose High-Quality, Well-Maintained Extensions

Plugins and themes from WordPress.org’s official repository undergo security and compatibility vetting. Community-maintained extensions receive regular updates and active developer support. Abandoned or low-quality plugins are significantly more likely to cause 500 errors as WordPress versions advance and PHP compatibility evolves. Before installing any plugin or theme, verify:

(1) the last update date is within the past 6 months (indicating active maintenance),

(2) the user rating is 4.0+ stars,

(3) active installation count is high (indicating widespread use and testing), and

(4) the developer maintains an active presence in the WordPress.org forums.

Monitor Your Site’s Health Regularly

Install and enable the Health Check plugin, and review your site’s status weekly. The built-in Tools > Site Health feature in WordPress 5.2+ alerts you to PHP version mismatches, plugin incompatibilities, SSL certificate issues, and HTTPS configuration problems before they cascade into 500 errors. Addressing warnings early keeps hidden issues from becoming critical failures. Many 500 errors are preventable simply by monitoring health checks and fixing issues before they impact site functionality.

Frequently Asked Questions

What does a 500 Internal Server Error mean in WordPress?

A 500 error indicates your server encountered an unexpected condition during request processing that it couldn’t resolve. It’s intentionally generic for security; your server won’t expose system details to potential attackers. The issue may come from a faulty plugin, a theme conflict, a corrupted .htaccess file, insufficient PHP memory, exceeded execution time, or server-level resource constraints. Enable debugging via wp-config.php to identify the specific cause and guide your troubleshooting.

Is a 500 error dangerous or will it delete my content?

No, a 500 error is a server response failure, not data corruption or loss. Your posts, pages, media files, and database remain completely intact and safe throughout the error. The error temporarily prevents WordPress from processing requests; once you fix the underlying cause, your site resumes normal operation, and all content is unaffected. WordPress data loss requires deliberate action (database deletion, filesystem corruption) and does not happen as a result of errors.

How do I know if a plugin is causing my 500 error?

Enable debugging by adding define( ‘WP_DEBUG_LOG’, true ); to wp-config.php, then check wp-content/debug.log for error messages naming a plugin file. Alternatively, use the Health Check plugin’s Troubleshooting Mode to disable all plugins for your session; if the error disappears, you’ve confirmed a plugin is responsible. Re-enable plugins one at a time to isolate the specific culprit.

Why did my site show a 500 error after I updated a plugin?

Plugin updates sometimes introduce bugs or incompatibilities with your specific WordPress version, theme, or other installed plugins. The new version might call functions that don’t exist in your WordPress version, use incompatible PHP syntax, or require PHP extensions your server doesn’t provide. Check your debug.log for the conflicting plugin name, then either downgrade to the previous version via your plugins dashboard or contact the plugin’s developer to report the incompatibility.

Can I fix a 500 error without accessing my hosting File Manager?

If you retain WordPress dashboard access, yes, use Health Check’s Troubleshooting Mode and the Plugins page to deactivate problematic extensions. If you cannot access the dashboard at all, you’ll need File Manager or FTP access to rename plugin folders or edit wp-config.php. Most hosting control panels include a File Manager tool you can access via your hosting account login, no command-line or FTP knowledge required.

Does my hosting provider’s uptime SLA cover 500 errors from plugins?

Typically, no. Hosting SLAs cover network and infrastructure uptime, whether your server is reachable and responding. 500 errors caused by plugin conflicts, a corrupted .htaccess file, or insufficient PHP memory are site-level issues within WordPress, not infrastructure failures covered by SLAs. However, if your hosting account’s resource limits are consistently exhausted, your hosting provider may advise upgrading your plan or adjusting resource allocations.

What’s the difference between a 500 error and other HTTP errors like 404 or 403?

A 404 error means a requested page doesn’t exist (you requested a URL WordPress couldn’t find). A 403 error means access is forbidden due to permissions or security restrictions. A 500 error means the server tried to process your request but encountered an unexpected problem; it’s a server-side failure, distinct from the client-side or authorization issues represented by 404 and 403.

How long does it usually take to fix a 500 error?

Most 500 errors resolve within 15–30 minutes following the systematic troubleshooting steps outlined in this guide: disable a faulty plugin (5 minutes), regenerate .htaccess (2 minutes), refresh the site (1 minute), verify resolution (2 minutes). Complex issues involving corrupted core files, server-level resource exhaustion, or obscure plugin conflicts may require 1–4 hours and hosting provider involvement, depending on your support SLA and site complexity.

Will enabling WordPress debugging slow down my site?

Enabling WP_DEBUG and WP_DEBUG_LOG adds minimal overhead; writing error messages to a file consumes negligible resources on modern servers. For most sites, the performance impact is imperceptible. Once you’ve resolved your 500 error, disable debugging by removing those constants from wp-config.php to eliminate even this minimal overhead and follow security best practices on production sites.

Can a 500 error indicate my site has been hacked?

Possibly, but it’s far less common than plugin incompatibility or corrupted files. Malware can trigger 500 errors by injecting malicious code into plugins, themes, or .htaccess files, causing execution failures. If you suspect malware, examine your debug.log for suspicious file references or unfamiliar function calls, scan your installation with a security plugin, or contact your hosting provider’s security team for forensic analysis.

What if my debug.log shows multiple errors?

Review the most recent error first (at the bottom of the file). Fatal errors halt script execution; the first fatal error in the chronological sequence usually causes your 500 error. If multiple fatal errors appear, fix the first one, then check whether the remaining errors persist. Often, fixing the initial issue resolves cascading failures.

Why does my host recommend increasing memory_limit to 256M if WordPress core only needs 64M?

WordPress core requires about 64M minimum, but plugins add significant functionality and consume more memory. Media processing, image resizing, caching operations, and database queries push total memory usage well above core requirements. A 256M allocation provides ample headroom for plugins and themes without exhausting the memory limit, balancing functionality with server resource constraints.

Can I fix a 500 error on a WordPress.com site?

No, WordPress.com (the hosted blogging platform operated by Automattic) differs fundamentally from self-hosted WordPress.org installations. WordPress.com restricts access to wp-config.php, .htaccess, and hosting-level settings. If you experience a 500 error on WordPress.com, contact WordPress.com support directly; they manage the infrastructure and handle troubleshooting. This guide applies exclusively to self-hosted WordPress sites.

Where do I find my WordPress admin email to check for Recovery Mode messages?

Log in to your WordPress dashboard, navigate to Settings > General, and locate the “Administration Email Address” field. This email address receives Recovery Mode alerts when fatal errors occur. Check that email’s inbox and spam folder for messages with subjects like “Your Site is Experiencing a Technical Issue” or similar critical error notifications from WordPress.

Can I prevent 500 errors entirely?

You cannot eliminate 500 errors; they can still occur due to unforeseen server issues, rare edge-case plugin conflicts, or temporary resource exhaustion. However, you can reduce frequency substantially by keeping plugins and WordPress up to date, choosing high-quality extensions, enabling automatic backups, and regularly monitoring site health. A debugging strategy and your hosting provider’s contact information ensure you can respond quickly when errors do occur, minimizing downtime impact.

Glossary

• PHP memory_limit: The maximum amount of RAM (in megabytes) a single PHP script is allowed to consume during execution. Exceeding this limit triggers a fatal error and terminates the script. The WordPress default is often 64M; most modern WordPress sites require 256M or higher, depending on installed plugins and theme complexity.
• max_execution_time: The maximum number of seconds a PHP script is allowed to run before the server forcibly terminates it. The default is typically 30 seconds. Bulk operations like database imports, WooCommerce order exports, and complex theme installations often require 120–300 seconds or higher.
• .htaccess: A server configuration file used on Apache and LiteSpeed web servers to set URL rewrite rules and server directives. WordPress uses .htaccess to transform visitor-friendly URLs (yoursite.com/about/) into backend arguments WordPress understands. Corruption or missing mod_rewrite module support causes 500 errors and 404 errors on posts and pages.
• mod_rewrite: An Apache web server module that enables URL rewriting functionality. Without this module enabled, WordPress cannot properly process requests, and .htaccess rewrite rules fail silently, often resulting in 500 errors or 404 errors on posts, pages, and custom post types.
• Recovery Mode: A WordPress 5.2+ feature that automatically activates when fatal errors occur. Recovery Mode temporarily pauses the faulty plugin or theme for the logged-in user only, sending an admin email with a recovery link. This lets administrators access the dashboard and fix the problem without SFTP access or developer help.
• wp-config.php: The WordPress configuration file located in your site’s root directory, containing database credentials, security keys, and PHP constants controlling WordPress behavior. This file is where you enable debugging, adjust memory limits, define security salts, and configure other WordPress core settings.
• Debug Log: The wp-content/debug.log file is created when WP_DEBUG_LOG is enabled in wp-config.php. WordPress writes all errors, warnings, notices, and diagnostic information to this file, providing detailed troubleshooting data without exposing errors to site visitors.