Database connection issue

[eluser]metalking[/eluser]
Hi everybody!

I'm having a problem with my CI app. On my computer, running PHP5 and MySQL, everything's OK, my app connects to the database, retreives datas...

The problem is, when I upload my application (with new database.php and config.php files with the actual informations of my webhost), CI cannot connect to my database, and shows the following error message:

Unable to connect to your database server using the provided settings.

What's the problem? My database infos are correct (I'm sure of this), the path to my application is correctly set in the config.php file...

Thanks

PS: My webhost is running PHP5 and MySQL too