Secondary DNS Fallback

HCL Notes/Domino 8.5 Forum (includes Notes Traveler)

Subject:

I reported this problem to IBM over a year ago when we were still running 8.0.2. In the end they gave me some debug commands to run the next time it happened so I could capture additional output. The problem is that after enabling the settings I had to restart the router which would fix the problem. It only occurred every few months so I just accepted it and restarted the router when it happened.

When we upgraded to 8.5.1 (skipping 8.5.0) in October I was hoping the problem got fixed. I have still seen it though. The difference now is that it will resolve itself over time. Someone will report an outbound e-mail being returned a couple times. I'll send a test message to the same domain without problems. They will try their message again and it works. I think maybe the router cache is clearing automatically now.

This morning the issue returned but was not fixed by restarting the router or Domino. The problem turned out to be our primary DNS server was down. However the secondary was still up and running. This wasn't obvious at first because nothing else in our network was having issues. They had all fallen back on the secondary DNS server (as they should) and were working fine. Domino, however, was failing on the first server and giving up. As soon as I restarted the primary DNS server Domino started delivering outbound e-mails again.

Based on another "solution" posted in this thread it sounds like Domino doesn't fallback onto the secondary DNS server as it should. Is this the fault of Domino or Windows?

Feedback response number WEBB7YQLVG created by ~Ethan Rewegon on 12/14/2009