DNS question - So lost.

Vince · 19 Jun 2012 at 13:55

Hi All,

I have a quick question, I have currently two DNS Forward lookup zones for argument sake one is ABC.co.uk and is a primary zone and the other is ABC.local and is a secondary zone from a domain that we are migrating to.

I need to add the zone ABC.com to deal with internal routing of the address mail.abc.com as internally this is different to what it would be connecting in from the outside world.

I added the zone and all was good, or so I though. Today I have found a legacy website has stopped working which uses CDONTS I checked everything through and finally found that the new zone was what was causing the issue, I delete the zone and all is good.

I have tried adding several records to the new .com dns zone but cannot seem to get this thing working at all, being no dns expert and having already spent an hour or so on this I am at a loss... Any help out there today?

PistolPete · 19 Jun 2012 at 14:37

What was the issue with the website - not sending mail?? Maybe it's not a DNS problem per se.

My guess is that your record in the new zone pointed to an internal IP that was either unavailable to the webserver, or was not configured to accept traffic from that host on that interface.

If it's the first, either make it available or use IP instead of FQDN.
If it's the later, reconfigure the mail host.

If it's neither of these......let us know

Vince · 19 Jun 2012 at 15:42

Hi Pete,

Cheers for the reply mate. The problem seems to be that when I add a new DNS zone the mail that would normally be sent out via CDONTS sits in the Queue folder.

These are normally sent out using the smtp connecter in IIS but adding a forward lookup zone for ABC.com seems to just stop this working regardless of if I add records to the .com zone or not.

I think that somehow I need to make the new zone aware of the exchange server which is on the .co.uk zone (or something like that)...

To be honest I have no idea, put simply before I add the zone I can telnet a message on port 25. After I add the zone it is a no go.

Teledude · 19 Jun 2012 at 16:42

MX record in the new zone pointing to your exchange server IP?

Vince · 19 Jun 2012 at 16:49

Teledude said:
MX record in the new zone pointing to your exchange server IP?

Gotta be worth a try.

PistolPete · 19 Jun 2012 at 17:53

What do the event logs say on the IIS box at the time mail is queued??

Vince · 20 Jun 2012 at 13:43

PistolPete said:
What do the event logs say on the IIS box at the time mail is queued??

Nothing it doesn't seem to log a thing, it is almost as if it just dissapears into the ether! To be fair cdonts is pretty 90's so I may even recode the forms.