I have installed Artio 3.2.12 on my Joomla 1.5x installation.

Now I can't configure Artio.
When I try to save the configuration IE gives the message HTTP 400 error and Firefox says Bad Request.

How can I solve this problem?

The php version is 4.4 (provider so I'am not be able to upgrade)

Hello,

I am afraid that based on this information, I cannot give you much valuable hints.

If this would be caused by PHP version - you should see an error message, so there may be even other problem. In any way, try to investigate http server error logs, you should be able to retrieve more information from there. Btw. even if you solve this problem, you may experience other troubles with PHP4. I would recommend you to upgrade - if you cannot do it with your current provider, you should start thinking about changing it.