Add MySQL server problem

[zeroborg]

Hi,

i have PLESK 9.0.1 and MySQL 4.0.10a installed. I would like to install MySQL 5.2 as well.
I managed to install it and have it run under Linux Shell (SUSE) at port 3307.
I have a php script that manages to connect to THAT SERVER with localhost:/tmp/mysql5.sock
I want to add the new DB Server to PLESK, but i can't.
The error is:

Test connection to the database server has failed because of network problems:
Lost connection to MySQL server during query.

Anyone has any idea about this problem?
From shell and php scripts i can use it. But i can't add it to PLESK.
Thanx...

Zero.