RPC server not available error when archive-enabling a mailbox ...

Hello,

Need some advice please.

Out DNS server was unavailable for several minutes yesterday. Now, when we try to archive-enable an Exchange mailbox, it gives a "Error: The RPC server is unavailable.  (0x800706ba)" error from the Agent Client Broker. 

Already restarted the EV services and the individual archiving task for the Exchange server hosting the mailbox. We have six Exchange servers and archiving tasks, the problem affects mailboxes on any server.

Any quick fix apart from a reboot?

EV10 server in a 2-node cluster on W2K8 aginst E2K10 with a DAG.

Thanks,

- Alan.