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Home » Kerio User Forums » Kerio Connect » Weird issues with Microsoft DNS and Kerio (same server) (MS DNS and Kerio)

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I have Kerio mail server installed on Windows 2003 R2 server. On this same server I have Microsoft DNS installed. I use this for Secondary DNS, so mail always has a fresh copy of the DNS to use.

I am using 2 IP addresses in Windows. The Microsoft DNS is bound to only one IP address.

I love Kerio. Everything is rock solid, most of the time. Occasionally I run into strange issues. I wish I could be more specific, but I think the MS DNS is the problem.

Occasionally mail gives me "cannot connect to remote host" error message. Usually mail will send a few hours later.

Today, all outgoing mail mail was trapped with that same error. I checked the firewall and everything was fine. I have a filtering rules to restrict outgoing smtp mail from non-mail servers. When I removed that rule everything starting flowing again.

I have configured Kerio to only send SMTP mail on the mail IP.

For now, I have removed MS DNS and that IP address from the Kerio system.

My question to you: Does anyone use Kerio and MS DNS on the same server?

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I have configured Kerio to only send SMTP mail on the mail IP.

I think what you're looking at is the SMTP listen address. Kerio, unlike every other mailserver I've used, doesn't have a way to specify which IP address to use for sending. It's been a long standing complaint, and causes problems for a number of people in the forums. Most likely, when you have problems with mail not sending, it used the DNS IP and bounced off the firewall.

You could add the DNS IP to the list of addresses allowed to send SMTP. You could also do away with the second address and have them both listen on the same IP.


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I bet you're right!

I could configure my firewall server to accept the DNS address; no problem. However, when mail is sent what happens in the real world when the mail server/spam gateway does a reverse address lookup?


Email Server is
DNS Server

Email PTR is

Thanks for your help.

As an aside, Kerio is good product. It seems like it could be a great product without some of these "fiddly-bits", to coin a phrase.

[Updated on: Wed, 14 October 2009 19:05]

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