[Winpcap-users] Using WinPcap "breaks" TCP

[Marc Rennhard]

Googling, I just found that there seems to be problem with using Winpcap and
Kerio Firewall and in fact, terminating Kerio has "solved" the problem for
me on both my systems. Is there any fix to use both Kerio and Winpcap
because I do not want to switch to another personal firewall? Or is there a
recommendation for a personal firewall product that has no known
compatibility issues?

Thanks,
Marc


Dear all,
>
> I'm having a strange problem that I believe is related to WinPcap because
> it only happens with the two WinPcap-based applications I use (Wireshark and
> Cain).
>
> I use the latest Wireshark and Cain versions with Winpcap 4.0.1 under
> Windows XP with all latest patches and drivers. The problem occurs on both
> my Laptops, a Thinkpad T40p and a T60. It happens with both the wired and
> wireless interfaces. The problem did not happen until a few weeks ago,
> though I cannot tell exactly when it started or what ( e.g. software
> upgrades) may have been the cause.
>
> The symtomps are as follows: without running Wireshark/Cain, networking
> works fine. When starting Wireshark or Cain, it still works. When starting
> sniffing, TCP-based applications no longer work. With Wireshark, I can see
> that the 3-way handshake is recorded (so handshaking seems to work), but no
> data is exchanged afterwards and the TCP connection "hangs". Other protocols
> still seem to work, e.g. name resolutions (UDP-based) work flawlessly.
> Even after terminating Wireshark or Cain, TCP remains "broken" and only
> rebooting helps.
>
> Does anyone have an idea what the reason for this problem may be?
>
> Thanks for any help,
> Marc
>
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