If you are still experiencing problems and are looking in your error logs you can check out the PHP errors below for more information.
There can be a number of reasons for an Internal Server Error. If you are sure your configuration is correct you could try resetting your My SQL password manually. The following hosting issues may be causing the problem: for errors, and confirmed with your host for hosting issues, it is possible that your site has been hacked.
There is more information on permalinks in the Word Press Codex.
You may experience problems with 404 errors and custom post types.
Someone will have encountered the same message before and it can easily be solved.Try the following steps: There are a number of different errors that will appear in your error logs.To access your error logs you will need to turn on debugging and then locate your error log via FTP.Mod_rewrite is an extension module of the Apache web server software which allows for "rewriting" of URLs on-the-fly. Word Press Multisite networks usually experience this but it can also occur on shared hosting providers or after a site migration or server move.Reset your permalinks through Settings file, contact your hosting provider to ask them to turn on mod_rewrite rules.If you are unable to do this from within the Administration Screens, you may have to do this manually via FTP.