Articles
403 Error on POST
Errors & Troubleshooting | Updated January 2026 A 403 Forbidden error on POST requests (form submissions) is almost always caused by...
403 Forbidden Error
Errors & Troubleshooting | Updated November 2026 A 403 Forbidden error means the server understood your request but refuses to fulfill it....
530 Login Authentication Failed When Connecting Over FTP
FTP | Updated November 2026 The "530 Login authentication failed" error in FileZilla and other FTP clients means your username and password were...
central_filter defer (-17): error in filter file: unknown filtering command r_subject: near line 22 of filter file
Errors & Troubleshooting | Updated January 2026 The "central_filter defer (-1): error" message in email bounce notifications indicates that the...
Cloudflare Error 520: Web Server Returned an Unknown Error
Errors & Troubleshooting | Updated November 2026 Cloudflare Error 520: Web Server Returned an Unknown Error means Cloudflare opened a...
Cloudflare Error 521: Web Server Is Down
Errors & Troubleshooting | Updated November 2026 Cloudflare Error 521: Web Server Is Down means Cloudflare could not open a connection to your...
Cloudflare Error 522: Connection Timed Out
Errors & Troubleshooting | Updated November 2026 Cloudflare Error 522: Connection Timed Out means the TCP connection from Cloudflare to your...
Cloudflare Error 524: A Timeout Occurred
Errors & Troubleshooting | Updated November 2026 Cloudflare Error 524: A Timeout Occurred means Cloudflare connected to your origin and your...
Cloudflare Error 525 and 526: SSL Handshake Failed
Errors & Troubleshooting | Updated November 2026 Cloudflare Error 525: SSL Handshake Failed and Cloudflare Error 526: Invalid SSL Certificate...
Email Firewall Block: Too Many POP3 or IMAP Logins
Email and Webmail | Updated August 2026 If your IP was blocked by the server firewall with a message about POP3 or IMAP logins exceeding an hourly...
ERR_TOO_MANY_REDIRECTS: Fixing the Redirect Loop After Enabling SSL or Cloudflare
SSL & HTTPS | Updated November 2026 The "ERR_TOO_MANY_REDIRECTS" error (also shown as "redirected you too many times") means your browser got...
Error 406 unacceptable
Errors & Troubleshooting | Updated November 2026 A 406 "Not Acceptable" error means the server understood your request but the response it...
Error 500 - Internal Server Error
Errors & Troubleshooting | Updated November 2026 A 500 Internal Server Error means something went wrong on the server while processing your...
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...
Error: SoftException in Application(dot)cpp:303 UID of script is small than min_uid
Errors & Troubleshooting | Updated November 2026 The "SoftException in Application.cpp: UID of script is smaller than min_uid" error means a...
FileZilla GnuTLS Error and Could Not Connect to Server Over FTPS
FTP | Updated November 2026 A "GnuTLS error" or "Could not connect to server" message in FileZilla when using FTP over TLS (FTPS) means the...
Gmail Send Mail As Error: 535 Incorrect Authentication Data
Email and Webmail | Updated September 2026 If Gmail bounces your message with "535 Incorrect authentication data" and a CustomFromDenied help link,...
How do I customize error messages for my site?
Errors & Troubleshooting | Updated November 2026 When visitors hit a 404 (page not found), 403 (forbidden), or 500 (server error) page on your...
How to Clean Malware from a Hacked Website (Non-WordPress)
Errors & Troubleshooting | Updated July 2026 If your Joomla, Drupal, custom PHP, or plain HTML site on Ultra Web Hosting has been hacked, this...
ModSecurity Blocked a Legitimate Request: How to Get It Whitelisted
Errors & Troubleshooting | Updated July 2026 Every Ultra Web Hosting server runs a web application firewall called ModSecurity that inspects...
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 November 2026 The "PHP Warning: mkdir(): Permission denied in wp-content/plugins/" error means a WordPress...
Premature end of script headers
Errors & Troubleshooting | Updated January 2026 "Premature end of script headers" is an Apache error that appears in your error log when a CGI...
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,...
Unable to Include Potential Exe - ModSecurity Error
Errors & Troubleshooting | Updated November 2026 The error "Unable to include potential exe" is a ModSecurity false positive. It means the...
Why a TLS Checker May Report Your Mail Server Does Not Support TLS
Email and Webmail | Updated October 2026 If an online SMTP or email diagnostic tool warns that your mail server "does not support TLS," your email...
