How to troubleshoot common errors that occur when you run the SharePoint Products and Technologies Configuration Wizard on a computer that is running Windows SharePoint

http://support.microsoft.com/kb/944267

To resolve this issue, clear the file system cache on all servers in the server farm on which the Windows SharePoint Services Timer service is running. To do this, follow these steps:

1. Stop the Timer service. To do this, follow these steps:
   1. Click Start, point to Administrative Tools, and then click Services.
   2. Right-click Windows SharePoint Services Timer, and then click Stop.
   3. Close the Services console.
2. On the computer that is running Microsoft Office SharePoint Server 2007 and on which the Central Administration site is hosted, click Start, click Run, type explorer, and then press ENTER.
3. In Windows Explorer, locate and then double-click the following folder:
   Drive:\Documents and Settings\All Users\Application Data\Microsoft\SharePoint\Config\GUID
   Notes
   • The Drive placeholder specifies the letter of the drive on which Windows is installed. By default, Windows is installed on drive C.
   • The GUID placeholder specifies the GUID folder.
   • The Application Data folder may be hidden. To view the hidden folder, follow these steps:
     1. On the Tools menu, click Folder Options.
     2. Click the View tab.
     3. In the Advanced settings list, click Show hidden files and folders under Hidden files and folders, and then click OK.
   • In Windows Server 2008, the configuration cache is in the following location:
     Drive:\ProgramData\Microsoft\SharePoint\Config\GUID
4. Back up the Cache.ini file.
5. Delete all the XML configuration files in the GUID folder. Do this so that you can verify that the GUID folder is replaced by new XML configuration files when the cache is rebuilt.
   
   Note When you empty the configuration cache in the GUID folder, make sure that you do not delete the GUID folder and the Cache.ini file that is located in the GUID folder.
6. Double-click the Cache.ini file.
7. On the Edit menu, click Select All.
8. On the Edit menu, click Delete.
9. Type 1, and then click Save on the File menu.
10. On the File menu, click Exit.
11. Start the Timer service. To do this, follow these steps:
    1. Click Start, point to Administrative Tools, and then click Services.
    2. Right-click Windows SharePoint Services Timer, and then click Start.
    3. Close the Services console.
    Note The file system cache is re-created after you perform this procedure. Make sure that you perform this procedure on all servers in the server farm.
12.  Make sure that the Cache.ini file has been updated. For example it should no longer be 1 if the cache has been updated.
13. Click Start, point to Programs, point to Administrative Tools, and then click SharePoint 3.0 Central Administration.
14. Click the Operations tab, and then click Timer job status under Global Configuration.
15. In the list of timer jobs, verify that the status of the Config Refresh entry is Succeeded.
16. On the File menu, click Close.

SPUpdatedConcurrencyException While Installing SharePoint 2010 Service Pack 1

http://sajiviswam.wordpress.com/2012/03/01/spupdatedconcurrencyexception-while-installing-sharepoint-2010-service-pack-1-2/

After installing SharePoint 2010 Service Pack 1 for SharePoint Server, the SharePoint Products and Technologies Configuration Wizard (either from GUI or using PowerShell) may fail throwing the following exception.

An exception of type Microsoft.SharePoint.Administration.SPUpdatedConcurrencyException was thrown. Additional exception information: An update conflict has occurred, and you must re-try this action. The object SPUpgradeSession Name=Upgrade -20110924-194525-15 was updated by DOMAIN\ACCOUNT, in the PSCONFIG (7240) process, on machine SERVER. View the tracing log for more information about the conflict.
Total number of configuration settings run: 3
Total number of successful configuration settings: 2
Total number of unsuccessful configuration settings: 1
Successfully stopped the configuration of SharePoint Products.
Configuration of SharePoint Products failed. Configuration must be performed before you use SharePoint Products. For further details, see the diagnostic log located at [LOCATION OF LOG] and the application event log.

This KB article describes the cause and and solution for this issue. The suggested solution is to clear Windows SharePoint Services configuration cache. Unfortunately, this may not work in most of the cases. If it doesn’t work, there is another workaround. This is by setting the ‘command-line-upgrade-running’ configuration property to ‘No’ and running Configuration Wizard again. Entire steps are given below.

1. Open command prompt as administrator.
2. Type in the command: stsadm -o setproperty -pn command-line-upgrade-running -pv No
3. Restart IIS and SP Timer
4. Run configuration wizard: psconfig -cmd upgrade -inplace b2b -wait –force