Here’s a solution I found to a weird issue I recently encountered. It was for a SharePoint 2007 site that had been upgraded to 2010 while also moved to a new domain. For some reason, a few of the user accounts were not getting authenticated properly. They would get the “Access Denied” page. This happened even if the person was set up as a Site Collection Administrator.
I found that this problem disappeared if I ran the following command:
stsadm –o migrateuser olddomain\username newdomain\username –ignoresidhistory
This command would return an error “Value cannot be null. Parameter Name: UserProfileApplicationProxy”. Regardless, the account could then log into the site.
Why? Don’t know.
