All sorts of issues creating a DAG in 2013 (CU1) – probably because of an aborted cross-domain DAG attempt (guessing this isn’t supported, but couldn’t find any docos saying so for 2013… doesn’t appear to work, so the pudding proves the point). Anyhoo, found this:
I had all 3 issues, and this fixed them – thank you Arnaud Buonaccorsi!
(BTW Scott Schnoll commented that article to point at the pre-staging recommendations at http://technet.microsoft.com/en-us/library/ff367878. He’s probably right; if I’d RTFM I’m sure it would have worked first time, but I’m in a test lab and haven’t got the time to do things the right way 😉 )