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I know I'm just missing something, but I hope someone can clear up my muddled brain here...

I had our Kerio mailserver on the DMZ port of our firewall. Everything worked fine. We were able to use webmail, and Outlook via the KOC, both onsite and offsite. It was working, but it was extremely slow for our onsite users.

We decided to take the mailserver off the DMZ of our firewall and put it inside the network, believing that if internal users didn't have to go through the firewall their connections would probably be faster. We were right. The speed of the internal connection through the KOC is at least 100% faster. Sending/Receiving, no problem. Amazing! Great, right?


Now my users have no access to their mail offsite, and I don't know why. I have port 80 open, pointing to my mailserver, yet when I try to access my server offsite I get an invalid (unknown) IP address message. I have port 25 open pointing to my mailserver as dice. Can't connect offsite through Outlook anymore.

Will opening port 143 solve my problem, or am I on the wrong track here?

Can one of you clear thinkers get me through this while I still have hair?


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As I understand it, the KOC requires ports 80 & 143. I don't think it uses 25 (sent mail goes via RPC calls through port 80, I think).

Good is better than evil because it's nicer
--Mammy Yokum

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actually KOC does just send mail using SMTP (usually 25)


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peterj is correct, KOC uses HTTP, IMAP and SMTP, so if you are using the default ports, you need to have ports 80, 143, and 25 open.

Kevin Trumbull
Kerio Technical Support Team Leader
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