No access to the database server [Solved]

hello,

I'm in big trouble, somebody please help me!!

Well.. the problem is simple: This is the message I get when I try to open my index.php page in a browser.

" No access to the database server

Impossible to connect to the database server mentioned in your configuration file. Please follow the link to check connection parameters.

Jump to the configuration page "

Of couse, since there's no connection to the database, I cannot log in and obviously I cannot configure anything..

The only solution would be to manually edit the configuration file and then upload it ...

My questions are:

1. Which file do I have to edit? (there are several configuration files in the yacs directory and none of them seems to be the right one)

2. Why did this happen? Could this be the fault of the hosting server?

thank you in advance, alex