After applying a cumulative update on one of my SharePoint server, tried to run configuration file using psconfig.exe -cmd upgrade -inplace b2b -wait -force command, i got an error saying that "Exception: Microsoft.SharePoint.Administration.SPUpdatedConcurrencyException: An upgrade conflict has occurred and you must re-try this action"
We can fix this exception by setting line-update-running property to true. To do that Open command prompt with administrator privileges and navigate to bin folder (C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\Bin) and execute following command
stsadm -o setproperty -pn command-line-upgrade-running -pv Yes
By running this command on SharePoint server, it will reset the command-line-upgrade-running property. We need to execute this command on all the SharePoint servers in the farm after upgrading. Once we are done with running this command, we have to run config command as
psconfig.exe -cmd upgrade -inplace b2b –wait –force