I tried to upgrade our MOSS 2007 Database server from 2000 to 2010, but got some error message when I restored the full farm backup.
Then I decided to join MOSS 2007 to the old database server again via the SharePoint Products and Technologies Configuration Wizard.
But I got some error message during the configuration wizard:
the error message is : Failed to connect to the configuration database. An exception of type System.ArgumentException was thrown. Additional exception information: Item has already been added. Key in dictionary: '380' Key being added: 380'
Can anyone please help me fix the issue asap?
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