After installing our SharePoint 2013 Farm with March 2013 PU, we are facing some serious issues. When checking the SharePoint log files; Can not connect to configuration database due to compatibility issue: Microsoft.SharePoint.Upgrade.SPUpgradeCompatibilityException: SharePoint object [SPConfigurationDatabase] is in an unsupported state, and could not be used by the current farm. powershell (0x4A08) 0x3A8C SharePoint Foundation Upgrade SPConfigurationDatabaseSequence ajyxu ERROR Upgrade object too new (build version = 15.0.4481.1005, schema version = 15.0.11.0). Current server (build version = 15.0.4420.1017, schema version = 15.0.10.0). 00000000-0000-0000-0000-000000000000 05/13/2013 07:00:09.81 powershell (0x4A08) 0x3A8C SharePoint Foundation Upgrade SPUpgradeSession ajxmu DEBUG Skip [SPConfigurationDatabase] NeedsUpgrade. 00000000-0000-0000-0000-000000000000 When you check Central Administration, Upgrade and Migration, Review database status, the configuration database : No action required When checking the Upgrade status, I can see 5 out of 6 servers have succeeded to upgrade, one is not, but when running the config wizard on that box, it does show: completed successfully

Hi Jan, I think the SharePoint Versions is mismatched. So the Schema version also differ from one version to another version. Check the SharePoint Version and upgrade accordingly. SharePoint 2013 Build Numbers ---------- Vadivelu B Life with SharePoint