I am trying to run Test-spcontentdatabase on a MOSS database on a SQL server (2008 R2). When I run it I get "The server instance of the database could not be found." The ULS has no more information than this.
I can connect to the SQL server with management studio just fine from my SP2010 box. I can even create a content database on the SQL box. I get network traffic on wireshark. 2 packets leaving my SP2010 box and 6 returning from my SQL box. Netmon shows no errors when that command is run on either box. The DBA sees no evidence that the powershell command is actually hitting the SQL instance.
UPDATE: Just to see we ran Upgrade-SPContentDatabase and it works?! Test-SPContentDatabase does NOT?!