Articles

403 Error on POST
Errors & Troubleshooting | Updated 2026 A 403 Forbidden error on POST requests (form submissions) is almost always caused by ModSecurity...
8,375
403 Forbidden Error
Errors & Troubleshooting | Updated March 2026 A 403 Forbidden error means the server understood your request but refuses to fulfill it. Unlike...
26,557
central_filter defer (-17): error in filter file: unknown filtering command r_subject: near line 22 of filter file
Errors & Troubleshooting | Updated 2026 The "central_filter defer (-1): error" message in email bounce notifications indicates that the...
7,607
Error 406 unacceptable
Errors & Troubleshooting | Updated 2026 A 406 "Not Acceptable" error means the server understood your request but the response it would...
10,539
Error 500 - Internal Server Error
Errors & Troubleshooting | Updated March 2026 A 500 Internal Server Error means something went wrong on the server while processing your...
18,597
Error Log Produces Flood of Missing Modules
Errors & Troubleshooting | Updated March 2026 If an account's error_log file is growing rapidly with repeated "module not found" or "undefined...
2,423
Error: SoftException in Application(dot)cpp:303 UID of script is small than min_uid
Errors & Troubleshooting | Updated 2026 The "SoftException in Application.cpp: UID of script is smaller than min_uid" error means a PHP or CGI...
8,990
How do I customize error messages for my site?
Errors & Troubleshooting | Updated 2026 When visitors hit a 404 (page not found), 403 (forbidden), or 500 (server error) page on your website,...
11,249
PHP Warning: mkdir(): Permission denied in wp-content/plugins/swift-framework/includes/options/redux-framework/inc/class(dot)redux_filesystem(dot)php
Errors & Troubleshooting | Updated 2026 The "PHP Warning: mkdir(): Permission denied in wp-content/plugins/" error means a WordPress plugin...
9,220
Premature end of script headers
Errors & Troubleshooting | Updated 2026 "Premature end of script headers" is an Apache error that appears in your error log when a CGI or PHP...
8,212
There Has Been a Critical Error on This Website
Errors & Troubleshooting | Updated March 2026 "There has been a critical error on this website" is WordPress's built-in fatal error handler,...
1,661
Unable to Include Potential Exe - ModSecurity Error
Errors & Troubleshooting | Updated March 2026 The error "Unable to include potential exe" is a ModSecurity false positive. It means the...
17,594