Sometimes when you are applying a cumulative update or service pack on SharePoint Servers using the following command:psconfig.exe -cmd upgrade -inplace b2b –wait -forceit fails on step 3 with the following error message:“Exception: Microsoft.SharePoint.Administration.SPUpdatedConcurrencyException: An update conflict has occurred, and you must re-try this action. The object SPUpgradeSession Name=Upgrade-TodaysDate was updated by CurrentlyLoggedOnUser, in the PSCONFIG (PID) process, on machine SharePoint2010. View the tracing log for more information about the conflict”If this happens you can use the following commands to reset the upgrade process so you can try again.Open command prompt on the SharePoint Server (Run as Administrator)cd \ cd “\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Bin” stsadm -o setproperty -pn command-line-upgrade-running -pv yesThen run your upgrade command againpsconfig.exe -cmd upgrade -inplace b2b –wait –forceIf the upgrade fails with any errors you will need to review the upgrade.log file as it contains detailed information to troubleshoot.
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