Observation - VPN Client Stateful Firewall impacts Wireshark.

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Apr 25th, 2008
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If you enable the "Stateful Firewall (Always On)" feature in the Options menu of the Cisco VPN Client, you will no longer be able to capture packets promiscuously with Wireshark, even when the tunnel is down, and the VPN Client is not in use.

Observed with Cisco VPN Client ver. Likely true of other versions.

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