https://DevOpsCloud.io -- Cloud Monk Losang Jinpa

See: https://github.com/dokuwiki/dokuwiki/issues

• with java.lang.XXXX – See: https://github.com/dokuwiki/dokuwiki/issues/4027 and https://forum.dokuwiki.org/d/21464-500-internal-server-error-whenever-javalangxxxxx-is-mentioned – This one is not a bug, see: https://www.dokuwiki.org/faq:mod_security. It is because:

When certain code examples are entered on a DokuWiki page, the Webserver returns a “Error 403 – Forbidden”, “Error 406 – Not Acceptable”, “Error 503 – Service Temporarily Unavailable” or similar errors. What's the problem?

This is usually a problem caused by overly-restrictive security policies set in the webserver (usually mod_security - https://modsecurity.org) or an application level firewall (Sophos Firewall Webapp Control is known to be problematic).

There is no way to fix this in DokuWiki, because it is not a problem caused by DokuWiki itself. You need to check your webserver or application firewall audit logs to identify the problematic firewall rule and disable it (or notify your provider to do so).

Commonly problematic words are parts of SQL statements, mail or UNIX commands like:

 * select ... from
 * drop ...
 * having ...
 * to: ...
 * wget ...
 * /etc/ ...

Sometimes the problem also occurs when certain parameters are passed in the URL, especially when they contain external URLs like when using external images that are loaded from DokuWiki's image cache system in lib/exe/fetch.php.