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I've been trying to get KOC (6.1.0 T11.5 and later) to work though a firewall without using port 80, and have been having problems.

SMTP runs on 25 and 2526
POP3 and IMAP run on default ports
HTTP runs on 8080
Secure HTTP runs on 443

Port 8080 is not allowed to traverse the firewall. All other listed ports are allowed to traverse the firewall.

The only way I can get KOC to work is if the Http port in Outlook is configured for port 80. I guess that means none of the services listed in Kerio Admin have anything to do with KOC.

Outlook is configured to connect on 143 for IMAP, 2526 for SMTP, and 80 for http.

Which ports does KOC use? Can I move the http port to something other than port 80. If it breaks the autoupdate for the KOC that is fine. I can address that later. Company isn't standardized on KOC yet, so manual process is acceptable for now.


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You may want to look into port forwarding. This would allow you to connect to your server on the port of your choice, then have the system forward your request to the mailserver on port 80 for the KOC to connect.

This would require you to have a separate server, or web instance on the mailserver, providing the port forwarding, something that I know can be done, as I have had to do this in the past to provide secure as400 access for a previous employer.

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