We have a Server 2003 R2 DC in mixed mode that houses the global catalog, DNS, Cloudmark, and Exchange. I know it's bad to put exchange on a DC, however it was already set up when I got to this company. We were getting event IDs 2012 and 2013 in conjunction every couple of hours. I solved 2013 (I believe by putting the other DNS server's IP as the secondary DNS in the NIC config and visa-versa), but I can't seem to figure out 2012. The message reads:
SMTP could not connect to the DNS server '192.168.0.54'. The protocol used was 'UDP'. It may be down or inaccessible.
Thing is, that DNS server <i>is</i> the Exchange server, they're the same box, and it's telling me it can't connect to itself. I don't have any kind of software firewall on the machine, i have DNS forwarders set up in DNS, however when I put them in the virtual SMTP server, I get errors. Is 2012 just something I'm going to have to live with? I would love to see clean event logs, but I know with such blatant disregard for best practices that might be wishful thinking. Any ideas?