One of my clients, after applying Windows Server 2003 with the latest windows updates, he got this error:

The schema version (3.1.3.0) of the database SharePoint_AdminContent_93139118-73ea-456d-86d9-c938e7a40497 on {dbserver} is not consistent with the expected database schema version (3.1.4.0) on {spserver}.  Connections to this database from this server have been blocked to avoid data loss.  Upgrade the web front end or the content database to ensure that these versions match.

Solution

Open a command prompt and insert this command, for each web application:

• STSADM.EXE -o upgrade -inplace -forceupgrade -url http://mySite