When I try to run Failover configuration on our primary Unity server 4.0(5) it fails on the SQL replication step, but doesn't say why. I tried manually connecting to the secondary server through query analyzer and fail with the generic could not connect message. I can connect from the secondary to the primary.
Maybe related, when I looked into re-running permissions wizard to verify accounts, I cannot add an account from the parent domain as the installer account, when that is the account that was used. This account does work on the secondary server.