To resolve this issue, verify the Update Manager database settings.
To verify Update Manager database settings:
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Connect to vCenter Server.
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If you have created separate database for Update Manager, verify the ODBC connection at Start > Control Panel > Administrative Tools > Data Sources ODBC.
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Click the System DSN tab, click Configure and verify the user information for the Update Manager database.
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If you are using a remote SQL 2000 or 2005 database, verify that the Update Manager user has a default Update Manager database assigned. If not, assign a default Update Manager database to the Update Manager user.
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Verify the permissions for the user to access the Update Manager database on the remote SQL database machine.
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Re-login to vCenter Server through the vSphere Client and verify that Update Manager is working. If it does not work, reboot.