We recently migrated to Microsoft SQL Server 2005, and were glad to see that it worked like a charm in Plesk 7.5.4. Plesk recognised it as SQL Server 9.0, and when entering the sa password in the 'Server' > 'Databases' page, a connection was made. We then upgraded to Plesk 7.5.5 this night, and we found out that Plesk fails to connect to SQL Server 2005 with the following error: "Unable to update database parameters: Try to establish connection failed: [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied." The password has definately not changed, how can this be?