Wireshark-users: [Wireshark-users] More problems with Windows 7 firewall
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From: David Aldrich <David.Aldrich@xxxxxxxxxxxx>
Date: Wed, 7 Mar 2012 11:02:38 +0000

Hi

 

I wrote in a thread last week that we have a Windows 7 console application that communicates with an embedded processor card using UDP.  I have watched the communication flow using Wireshark and it looks fine.  I have set, what I believe to be, appropriate inbound and outbound rules for Windows 7 firewall.  On one PC the application runs fine, but on another PC inbound packets on one port are not reaching the application.

 

The weird thing is that on the failing PC, if I start a Wireshark capture on the interface, the inbound packets do reach my application.  As soon as I stop the capture the inbound packets fail to reach the application.

 

Please can anyone suggest why Wireshark is having this effect?

 

Best regards

 

David