Home » Kerio User Forums » Kerio Control » Traffic Rules for a Kerio Connect behand a NAT (They don't behave as expected.)

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I have two rules:

Source Destination Services Action
KC IP Internet KC Services Allow
Internet KC IP KC Services Allow

But as soon as I put it, all traffic outbound from KC IP is negated. So, I took the outgoing traffic out, and gave the server an username.

But I need to strictly block all SMTP traffic from the LAN side, except for the mail server.

I have several subnets and VPN connections, and thus I want a simple rule to block all traffic from the subnet, unless its the server.

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You didn't include the translation section in your rules list, and I think thats where your issue lies. The following 3 rules will, in order:
1. Allow and Map incoming KC services to KC Server
2. Allow outgoing SMTP from KC Server
3. block all other SMTP traffic from any other device on all subnets.

Source - Destination - Services - Action - Translation
1. Any - "Public IP" - KC Services - Allow - MAP "KC IP"
2. "KC IP" - Internet Interfaces - SMTP - Allow - NAT
3. Any - Internet Interfaces - SMTP - Deny - (BLANK)

To block only devices on a specific subnet change the last line Source to a host with the subnets info:
Source - Destination - Services - Action - Translation
3. X.X.X.X/XX - Internet Interfaces - SMTP - Deny - (BLANK)

- Brian
Kerio Preferred Partner, Reseller & Hosting Provider
Unified Technology Solutions
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