What cause an "Internal Server Error"

[vietfancy]

I wanna know what cause this internal server error.

when i try to get on to my forum. i have this "internal error message"

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@******.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.10 (Unix) mod_ssl/2.2.10 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at ******.com Port 80

[Kart_13]

Looks like you are trying to use SSL but the server isn't configured correctly

[Dismounted]

A mis-configured .htaccess file can also cause this error.

[cono1717]

Try cutting your .htaccess file to your computer then refresh the page if it then works your .htaccess file is causing the error.