Strange problem with reporting services... All of our reports use a handful of shared data sources, all of which we have set to "Credentials stored securely in the report server." The user ID is a domain account, and the credentials that put in here will work -- I can connect using management studio and everything, and when I type in the user ID & passwordand click the Test Connection button it works. But when I click Apply, then Test Connection, it fails, "Log on failed. Ensure user name and password are correct." I know it's correct, and the Test Connection even works before clicking Apply, so I know something is wonky with how this thing is storing the credentials.
The workaround, for now, is I set the Domain Users group to have read-access to the required database tables, then change the connection to "Windows integrated security."...