[TYPO3] Problems posting attachment .mp3 file in CHC forum

[Kenth]

Hi !

I am trying to post a .mp3 file in CHC forum. 

I have modified the folloeing in php.ini to :

upload_max_filesize = 20M and 
post_max_size = 25M 

When I try to post I get this error from Firefox:

 

The connection was reset
The connection to the server was reset while the page was loading.

* The site could be temporarily unavailable or too busy. Try again 
in a few moments.

* If you are unable to load any pages, check your computer's 
Network connection.

* If your computer or network is protected by a firewall or proxy, 
make sure that Firefox is permitted to access the Web.

 

I have configured the security settings in the CHC plug-in to:

Allowed attachment extensions (comma separated) : mp3 
Allowed attachment mime types (comma separated) : audio/mpeg

 

Can anyone give me a hint to solve this problem ?

 

Kenth