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I have had a Kerio Control firewall for a number of years and it works great. I also admin several others.

I recently added a Kerio Connect mail server to my own Kerio Control protected network. The KMS is working great with devices inside and outside the network.

I am having one problem however. When, from devices inside the same network as the mail server, I connect to a remote Kerio VPN using the Kerio VPN Services service (not IPSeC), connectivity to the mail server breaks. Passing all traffic through the VPN remedies this problem with my own firewall, however I find it likely that this configuration was responsible for 3 crashes of a Kerio firewall I was using for VPN at the time (leading to the next point).

Another effect is on the local Kerio Control firewall: CPU usage spikes to the max, inbound traffic from the WAN is halted, and the following entries flood the log file.

(my IP) myname<_at_>myldapserver.mydomain.com "Login Page - Kerio Control" https://mymailserver.mydomain.com/login/index.php

Connecting to other VPN servers in these same netowrks does not break connectivity to the mail server or have any of the other negative effects, regardless of whether all traffic is passed through the VPN.

After connecting to a Kerio VPN three things happen:
1. The blue login page to the Kerio Connect webmail shifts to the red Kerio firewall login page.
2. There is a certificate error when mail is first checked. A screenshot of the certificate error is attached as this seems to be a strong clue.
3. Mail connectivity breaks.

The mail server is protected with a GoDaddy UCC cert, however I tried removing this cert from the mail server, replacing it with the self signed cer, and the problem remained. The certificate error only changed to the self-signed mail server certificate.

I configured the firewall rules as described in this article.
http://kb.kerio.com/product/kerio-connect/server-configurati on/services/services-in-kerio-connect-1153.html

Any insights?


[Updated on: Thu, 06 April 2017 00:12]


Messages: 42
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I figured it out.

On the Kerio firewall It was necessary to add "Trusted/Local Interfaces" to the Source list for the internal KMS. Internet Interfaces alone was causing the issue.
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