DATABASE CONECTION

[mattch]

I have roundcube installed on a webserver with apache2.2 and php5 on xp pro
my database server is located on another machine, it runs mysql 5 on windows 2000 adv. server

my db connection:
 'mysql://user:pass@192.168.3.51/rc';

i changed the user paswsword to a 4.1 style as described in the howto and then have user all privliges to rc database

i tried using host name (internal, and external*) instead of IP, with the same error :

*external host name with port forwarding to db server on 3306

DATABASE ERROR: CONNECTION FAILED!
Unable to connect to the database!
Please contact your server-administrator.

Any suggestions?
Thanks