Event ID - 601

Event Id601
SourceSharePoint Portal Administration Service
DescriptionAttempted to apply update to SharePoint Portal Server 2003 portal sites.
Event InformationAccording to Microsoft:
CAUSE:

This problem may occur when you install Microsoft Office SharePoint Portal Server 2003 Service Pack 2 (SP2) or when you apply a SharePoint Portal Server 2003 post-SP2 hotfix. When you install SharePoint Portal Server 2003 SP2 or apply a SharePoint Portal Server 2003 post-SP2 hotfix, an upgrade of a SharePoint Portal Server 2003 database occurs as a part of the update.

RESOLUTION:
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Review all SharePoint Portal Server 2003 logs. These logs include the *_spsadmin.log logs that are mentioned in event ID 601 in the "Symptoms" section. Correct failures as described in these logs. If correcting the issues that are found in all SharePoint Portal Server 2003 logs does not resolve the upgrade issue, use the following steps.
To resolve this problem, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SharePoint Portal Server\2.0\SPSDatabaseUpdate
3. Double-click UpdateRequired, type 1 in the Value data box, and then click OK.
4. Double-click UpdateComplete, type 0 in the Value data box, and then click OK.
5. Locate and then click the following subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\SharePoint Portal Server\2.0
6. Double-click TargetSchemaVersion_Portal, type the appropriate value in the Value data box, and then click OK.

Note The appropriate value for SP2 is 2.0.40.1. However, post-SP2 hotfixes may contain a different schema version. Make sure that you enter the appropriate value.
7. Quit Registry Editor.
8. Click Start, click Run, type services.msc
Reference Linksevent id:601 source:SharePoint Portal Administration Service

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