We are running Cisco VPN (3000 headend) clients (4.7.0) through a Cisco Pix 515 (6.3).
Our VPN clients are unable to connect to Windows Live Commnications Server 2005 using Windows Office Communicator. The communication is set for TCP (not TLS).
Looking at the PIX logs we see that the initial SIP message (Pre-Allocate) is permitted but then the client seems to send an acknowledgement before establishing the session. The PIX drops this because this packet is out of state.
Some references seem to hint that using TLS will solve this. It appears that the Microsoft client is not following protocol standards or am I missing something?
P.S. We tested that LCS does work through the VPN without a firewall.
November 4, 2005 12:31 PM
January 8, 2006 10:17 AM