We having been getting the "unable to log into the network because the login credentials or the server certificate is incorrect" for all of our users.
We have been through TIDs 3273870 and 7002202.

The system is running ZCM 10.3 on Windows 2003 server.

This only started yesterday morning. Doing some diagnostics and looking in zmd-messages.log the last entry we get after retstarting the services is
DEBUG] [09/07/2010 11:25:22.248] [1852] [ZenworksWindowsService] [24] [] [WebService] [] [Server returned a valid response from getZoneConfiguration(), but one of the ZoneConfigurationType.Items objects is an error. Code = -103 (No closest servers / no closest server rules found); Message = ] [] []

Trying to Google Zenworks and "No Closest Servers" yields a response from Novell.com/support, but the document is appears to be blocked. We get an error connecting to Knova (whatever that is).
Can anyone help point us in the right direction? We have several hundred users not able to work properly.

Many thanks.