Just updated a pure windows environment (ZCM Server Win2003, internal Sybase DB, Clients Vista Enterprise SP2) from ZCM 10.2 to 10.3.

Since the update of the server (which completed successful) users cannot login to the realm:

Unable to login to the network because the login credentials or the server certificate is incorrect

We've tried various fixes e.g. unregister, register, zac cc etc. without any success.

any ideas?