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Hi there,

We have a problem using Kerio Winroute Firewall : it seems the firewall engine blocks connections between the server running Kerio (which is a bridge-head MS Exchange 2003) and another server (main MS Exchange 2003), both on the same LAN.

Symptoms are as follows :
- the server running Kerio detects portscans from the second server.
- incoming emails arrive in the front Exchange SMTP queue, then should be routed (by SMTP) to the main Exchange server (hosting the mailboxes). Instead, they stay stuck forever in the queue.
- if we stop KWF, the emails are unqueued a couple of minutes later.

Those servers are hosted by an ISP, behind a firewall, so KWF is actually only used for the VPN module. Thus, the ruleset is quite simple : default rule is disabled, replaced by a rule authorizing everything from everyone to everyone on all ports. But this just doesn't seem to be enough.

Is there a SYN FLOOD and portscan blocking module or something that could interfere ? If so, how can it be deactivated ? We only need the VPN function of KWF...

Thanks for any help.

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After changing the Protocol Inspector option to None instead of Default, emails are not blocked anymore.

Quote answer from Kerio support :

Okay, KWF reports possible port scans, but does not block them. However, you are correct in disabling the protocol inspectors. In most cases (just about all of them actually) where email is blocked, it is a protocol inspection bug that is causing it.

You need the protocol inspectors turned on to scan email for viruses. So, if you are using antivirus features, you will need to continue to pursue this issue.

Case closed it seems.
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