{"id":5012,"date":"2026-06-25T10:57:22","date_gmt":"2026-06-25T10:57:22","guid":{"rendered":"https:\/\/www.copahost.com\/blog\/?p=5012"},"modified":"2026-06-25T14:34:54","modified_gmt":"2026-06-25T14:34:54","slug":"common-wordpress-errors","status":"publish","type":"post","link":"https:\/\/www.copahost.com\/blog\/common-wordpress-errors\/","title":{"rendered":"Common WordPress Errors and How to Fix Them: A Complete Guide"},"content":{"rendered":"\n

Most WordPress errors fall into a handful of categories \u2014 server errors (like 500, 502, 503, 504), connection errors (the ERR_CONNECTION family), WordPress-specific failures (the critical error, the white screen, database connection), and SSL\/HTTPS errors. Almost all of them are fixable, and the fastest way to solve any of them is to start by reading your error logs to find the real cause. This guide organizes the most common errors by type, explains what each means, and links to a complete step-by-step fix for every one.<\/strong><\/p>\n\n\n\n

\"Overview<\/figure>\n\n\n\n

If your WordPress site is showing an error, you’re in the right place. Rather than a giant unsorted list, this guide groups the most common errors the way they actually occur \u2014 by where the problem lives \u2014 so you can quickly find yours and jump to the detailed fix. We’ll also start with the one skill that makes every other error easier to solve: reading your logs.<\/p>\n\n\n\n

\n \n \n \n \n
Category<\/th>\n Error<\/th>\n In one line<\/th>\n <\/tr>\n <\/thead>\n
Server (5xx)<\/td>500<\/td>Generic internal server failure.<\/td><\/tr>\n
502<\/td>Invalid response from the backend.<\/td><\/tr>\n
503<\/td>Server up but temporarily unavailable.<\/td><\/tr>\n
504<\/td>Backend reached but timed out.<\/td><\/tr>\n
400<\/td>Server couldn’t understand the request.<\/td><\/tr>\n
Connection<\/td>REFUSED<\/td>Server actively refused the connection.<\/td><\/tr>\n
TIMED_OUT<\/td>No answer in time; often overload.<\/td><\/tr>\n
RESET<\/td>Connection cut mid-transfer.<\/td><\/tr>\n
WordPress<\/td>Critical error<\/td>PHP fatal error (WP 5.2+).<\/td><\/tr>\n
White screen<\/td>Blank page; same fatal error, pre-5.2.<\/td><\/tr>\n
DB connection<\/td>WordPress can’t reach its database.<\/td><\/tr>\n
SSL \/ HTTPS<\/td>SSL_PROTOCOL<\/td>Secure connection couldn’t be established.<\/td><\/tr>\n <\/tbody>\n <\/table>\n<\/div>\n\n\n\n

Start here: diagnose before you fix<\/h2>\n\n\n\n

Before working through fixes, it pays to find out what actually broke<\/em>. The error on screen is usually vague (“there has been a critical error,” a blank page, a status code), but your server records the real cause.<\/p>\n\n\n\n

The single most useful troubleshooting skill in WordPress is reading your error logs \u2014 they name the exact plugin, theme, or file behind most failures. If you do nothing else first, do this: see our full guide on how to enable and read WordPress error logs<\/a>. With logging on, most of the errors below turn from a guessing game into a specific, fixable cause.<\/p>\n\n\n\n

Server errors (5xx)<\/h2>\n\n\n\n

These appear when the server \u2014 or something behind it \u2014 fails to fulfill the request. They’re the most common errors on dynamic sites and almost always server-side.<\/p>\n\n\n\n

500 Internal Server Error.<\/strong> The catch-all server error: something failed but the server can’t say what. On WordPress it’s usually a corrupted .htaccess<\/code>, a PHP memory limit, or a plugin conflict. Full fix: HTTP error 500 in WordPress<\/a>, and the Nginx 500 internal server error<\/a> specifically.<\/p>\n\n\n\n

502 Bad Gateway.<\/strong> A gateway (like Nginx) got an invalid response from the backend it proxies to \u2014 often a stopped PHP-FPM. Full fix: 502 Bad Gateway in Nginx<\/a>.<\/p>\n\n\n\n

503 Service Unavailable.<\/strong> The server is up but temporarily refusing requests \u2014 overloaded, in maintenance, or a backend is down. On WordPress, a stuck .maintenance<\/code> file is a classic cause. Full fix: 503 Service Unavailable<\/a>.<\/p>\n\n\n\n

504 Gateway Timeout.<\/strong> A gateway reached the backend, but it took too long to respond \u2014 a timeout between servers. Full fix: 504 Gateway Timeout error<\/a>.<\/p>\n\n\n\n

400 Bad Request.<\/strong> The server couldn’t understand the request, often due to a malformed request, oversized cookies, or a bad URL. Full fix: 400 Bad Request<\/a>.<\/p>\n\n\n\n

Connection errors (browser-side)<\/h2>\n\n\n\n

These show up in the browser before the page even loads, usually as an ERR_<\/code> code. They can be the site’s server, the network in between, or something local.<\/p>\n\n\n\n

ERR_CONNECTION_REFUSED.<\/strong> The server actively refused the connection \u2014 it may be down, the service stopped, or a firewall is blocking it. Full fix: ERR_CONNECTION_REFUSED<\/a>.<\/p>\n\n\n\n

ERR_CONNECTION_TIMED_OUT.<\/strong> The connection attempt took too long with no answer \u2014 often an overloaded server or a network issue. Full fix: ERR_CONNECTION_TIMED_OUT<\/a>.<\/p>\n\n\n\n

ERR_CONNECTION_RESET.<\/strong> The connection was cut mid-transfer, frequently a network, firewall, or server-configuration issue. Full fix: ERR_CONNECTION_RESET<\/a>.<\/p>\n\n\n\n

WordPress-specific errors<\/h2>\n\n\n\n

These are failures inside WordPress itself \u2014 usually a plugin, theme, PHP, or the database.<\/p>\n\n\n\n

“There has been a critical error on this website.”<\/strong> WordPress’s modern catch-all for a PHP fatal error. Since version 5.2, it pauses the site and emails a recovery link instead of showing a blank page. Full fix: the WordPress critical error<\/a>.<\/p>\n\n\n\n

The White Screen of Death.<\/strong> A completely blank page with no message \u2014 what the critical error looked like before WordPress 5.2, usually caused by PHP memory exhaustion. Full fix: the WordPress white screen of death<\/a>.<\/p>\n\n\n\n

Error establishing a database connection.<\/strong> WordPress can’t reach its database \u2014 usually wrong credentials in wp-config.php<\/code>, a down database server, or a corrupted database. Full fix: error establishing a database connection<\/a>.<\/p>\n\n\n\n

PHP limit errors<\/h2>\n\n\n\n

The uploaded file exceeds upload_max_filesize.<\/strong> A PHP upload-limit error when a file is larger than the server allows \u2014 not a WordPress setting. Full fix: the upload_max_filesize error<\/a>.<\/p>\n\n\n\n

Maximum execution time exceeded.<\/strong> A PHP script ran longer than the server allows. Full fix: the max_execution_time error<\/a>.<\/p>\n\n\n\n

Allowed memory size exhausted.<\/strong> A PHP script ran out of memory. Full fix: the memory limit error<\/a>.<\/p>\n\n\n\n

Cannot modify header information \u2013 headers already sent.<\/strong> Stray output before the HTTP headers, usually whitespace in a PHP file. Full fix: the headers already sent error<\/a>.<\/p>\n\n\n\n

SSL and HTTPS errors<\/h2>\n\n\n\n

These appear when something is wrong with the site’s certificate or its secure connection.<\/p>\n\n\n\n

ERR_SSL_PROTOCOL_ERROR.<\/strong> The browser couldn’t establish a secure SSL\/TLS connection \u2014 often an expired or misconfigured certificate, an outdated protocol, or a server setting. Full fix: ERR_SSL_PROTOCOL_ERROR<\/a>.<\/p>\n\n\n\n

How to prevent WordPress errors<\/h2>\n\n\n\n
\n\n
\n
\n \n <\/path><\/polyline><\/svg>\n <\/span>\n
Keep everything updated<\/div>\n <\/div>\n
Most errors come from outdated or conflicting core, plugins, themes, and PHP versions.<\/div>\n <\/div>\n\n
\n
\n \n <\/path><\/svg>\n <\/span>\n
Back up regularly<\/div>\n <\/div>\n
A recent backup lets you roll back to a working site in minutes when something breaks.<\/div>\n <\/div>\n\n
\n
\n \n <\/rect><\/line><\/line><\/svg>\n <\/span>\n
Test on staging<\/div>\n <\/div>\n
Try updates and changes on a staging copy before applying them to your live site.<\/div>\n <\/div>\n\n
\n
\n \n <\/path><\/svg>\n <\/span>\n
Use solid hosting<\/div>\n <\/div>\n
Adequate resources, current PHP, and easy log access prevent most errors at the source.<\/div>\n <\/div>\n\n<\/div>\n\n\n\n

When the problem is your hosting<\/h2>\n\n\n\n

It’s worth being honest about a pattern in the list above: a large share of WordPress errors trace back to the server environment<\/strong> \u2014 PHP memory limits, PHP versions, resource caps, server configuration, and how easily you can reach your logs and files. On cheap, overcrowded shared plans, low limits and overloaded servers cause far more 500s, 502s, and 503s, and you often can’t fix them yourself.<\/p>\n\n\n\n

Good hosting prevents many of these errors at the source: adequate PHP memory and current PHP versions, resources that absorb traffic spikes, a properly configured server stack, easy access to error logs and a file manager, one-click backups to roll back fast, and staging to test updates before they reach your live site \u2014 plus responsive support for the cases that need server access. For a site that needs to stay online, that foundation is what keeps most of these errors from ever appearing.<\/p>\n\n\n\n

Frequently Asked Questions<\/h2>\n\n\n\n
\n\n
\n
What are the most common WordPress errors?<\/div>\n
The most common fall into four groups: server errors (500, 502, 503, 504, 400), connection errors (ERR_CONNECTION_REFUSED, TIMED_OUT, RESET), WordPress-specific failures (the critical error, the white screen of death, error establishing a database connection), and SSL\/HTTPS errors like ERR_SSL_PROTOCOL_ERROR.<\/div>\n <\/div>\n\n
\n
How do I find out what’s causing a WordPress error?<\/div>\n
Enable and read your WordPress error logs. With debug logging on, WordPress records the exact plugin, theme, or file behind most failures \u2014 turning a vague error into a specific, fixable cause. It’s the first step for almost every error in this guide.<\/div>\n <\/div>\n\n
\n
Will fixing an error make me lose my content?<\/div>\n
Usually not \u2014 most WordPress errors are code or configuration problems, and your content is stored safely in the database. Still, always make a backup before troubleshooting, so you can restore if something goes wrong.<\/div>\n <\/div>\n\n
\n
Why do so many WordPress errors come back?<\/div>\n
Recurring errors \u2014 especially 500s, 502s, and 503s \u2014 often point to the server environment: not enough PHP memory, an outdated PHP version, or an overloaded, under-resourced hosting plan. Better-resourced hosting prevents many of them at the source.<\/div>\n <\/div>\n\n<\/div>\n\n\n