Our 5510 switched to the standby unit 2 weeks ago, and since then, I have not been able to get the primary back online. The configs are identical line for line however when the primary is put back into service, dns requests from the internl servers are allowed out, but no reponses ever come back to them. When I switch back to the failover unit evreything works. I have flushed router caches, rebooted the dns servers and all connected internal and external routers, and even tried swapping ports and cables, but no luck. Does anyone have any ideas on what I might try next?
Thanks,
Steve...
