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

Please contact the server administrator, webmaster@rasyid.net 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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

I don’t know why this is happen, doing nothing and got the message

Contact my webhosting and he don’t know what happened.

After wait for 5 minutes it’s get back to normal, google search to this subject return a lot of other experiences :

•  What’s an "Internal Server Error" and how do I fix it? - Ask Leo!
• HTTP Error 500 Internal server error Explained
• Internal Server Error - Causes and Fixes

Looks like .htaccess has big portion in my case.

Hmm… I’ll look at my log first.