I cannot login to my new zen 10.1 server. I get the message:

Unable to connect to the ZENworks database. Please ensure that the ZENworks
database is running. One of the possible causes could be the database server
IP address changed. Please see the documentation for manual steps required
to fix the login issue associated with it.

How should I proceed to fix the problem?
The ZENserver was fully updated when I got this problem and after a reboot I
cannot login.
The ZEN server is a SLES 10 Sp2 and SQL is MS SQL 2005

Please help!

Jan S