Adding smileys - 404 error

[misus]

I'm not able to add smileys.
Everything worked fine. I added a lot of smileys until now and all of the sudden i started getting this msg error:

Internal Server Error

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

Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this 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.

What i do is :

Upload smiley with filezilla
Go to admin panel: Add smiley - select the file, give it a :code: and a description and it always worked this way.

[kat]

With Filezilla, is the "Transfer type", in the "Transfers" menu, set to "binary"? "auto" tends to break things.

Anything in your error logs?

[misus]

I also tried to upload 1 smiley at the time using the direct uplaod in the admin menu and i get the same error.

[misus]

Nothing in the error log.
Also when i try to simply change the order of the smileys i get this:

"Forbidden

You don't have permission to access /index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."

[kat]

Hmmm... I have to suspect that you're falling foul of either not having full CHOWN ownership of the files on your site and/or "mod_security".

Have a look at this:

http://www.simplemachines.org/community/index.php?topic=499374.0

[misus]

I can't be that because i worked it beautiful this just a few hours ago when i started getting this errors and not be able to add smileys

[kat]

You'd be surprised.

If you named a smiley "getwater" it could trigger it, coz it contains the word "Twat".

mod_security is crap, without a doubt.

[misus]

Thank you, K@.
mod_security was the issue 

[kat]

WoOt!