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by lordwalsingham

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OK, I'm MCSE 2000 and CCNA 2.0. IT Pro for fifteen years.

Haven't done much with Exchange. Bought a book, installed it, worked a treat.

Have a DC on one computer and Exchange running on a flat 2000 server installation on another computer. Bothbig new DELL PowerEdge servers, blah.

Everything was working fine 'til I change the IP address of both computers from 192.168.1.x/24 network to a 192.168.101.x/24 network. I realise that these numbers are irrelevant but hey...

Now no message gets through. You can send an email from Outlook without error and without a bounce. It just never gets through. The receiving client doesn't get it and it's no-where to be found in Exchange.

I checked DNS and looked everywhere I could think of for places that perhaps the IP address didn't 'ripple through'. It just doesn't work now and I need it to be on the new IP.

Seems a little odd. Anyone got any ideas about a little Microsoft oversight that could be messing up my install? I read somewhere about IIS having a problem when changing IP of a cluster set up, but this isn't a nut-cluster set up. I'll check there in the morning anyway, just to make sure...

Thanks y'all.

1 reply

by curlergirl

If you haven't already, check off of your DNS settings, and be sure that (1) each server that is a DNS server is set to use itself as primary and secondary DNS; (2) your Exchange server has valid DNS entries for internal/external name resolution; and (3) the new IPs have been properly registered with your internal DNS server(s). Then, if no problems exist there, there is one other place in the Exchange console itself, where you need to check and/or set the preferred DNS addresses. It's buriedkinda deeply. Open the Exchange System Manager console, and double click [sitename]/Administrative Groups/[domainname]/Servers/[servername]/Protocols/SMTP/Default SMTP Virtual Server. Right click on the Default SMTP Virtual Server and go to Properties/Delivery tab. Click the Advanced button and make sure your correct FQDN shows in the Fully qualified domain name box. Click Check DNS to make sure your default DNS server agrees that that is the correct name.

If all this checks out and you still can't send or receive email, you can configure an external DNS server in Exchange itself - normally your Exchange server should be able to resolve without this, but I've seen some cases in which it just doesn't work for some reason. This is at the bottom of the same dialog box - there is a Configure button that brings up a window to add an external DNS server or servers for Exchange to use exclusively.

Hope this helps!

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