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Windows XP as server
1x ADSL Dialup
2x 3Com Gigabit Lan:
Lan-1 : - (+/- 5 clients)
Lan-2 : - (+/- 10 clients)

The first hours everything worked as a charm. But at a certain moment KWF blokked all traffic on Lan-1. Even a simple ping from to didn't work, nor the opposite way.

I think to myself...
I add a extra interface card (Lan-3), I change the IP to, and I set Lan-1 to

Lan-1 still doesnt work, but now Lan-3 works fine... till a few hours ago. Now Lan-1 AND Lan-3 are blokking all traffic...

Any help??


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check logs, check rules, check routing tables (when occur) etc. Start with enable logging at interface and debug if needed.


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Try changing the network with the address of to say and test.
Ensure to also check your advance options in the properties of the both network card to ensure that the windows firewall is not enabled.

Good luck

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I've tried that... without success

However, I've put in another Network Card, another model from 3Com... And everything seems to work fine now.

Maybe it is a bug when using multiple Gigabit lan cards from 3Com (model 3C2000)?

Lets hope that it stays that way Wink
water puts out fire

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Is it a bug or is it a feature?

When you unplug a patch lead from the NIC, windows know the LAN is disconnected - kerio picks up on this and shuts down the firewall. (I could access my LAN and external router via a browser but that was all). Reboot the kerio PC and your back online.

Yup, its a feature for a paranoid IT manager
Yup, its a bug when you are commissioning and don't know it works this way.
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