Live Communication Server problem within VPN

mellowgb59 · ‎09-15-2008

We are using Microsoft Live Communication Server and have users who log in via Cisco VPN and have problems with maintaining IM sessions with other LCS users. Within the ASA 5520 I have disabled SIP inspection. Users intermittently lose connections within their LCS sessions via VPN. Most of the users have Cisco client 4.6.x, some have 4.8.x. All other applications work ok within the VPN session. Has anyone else experienced this issue with Microsoft LCS? Are there any other config parameters that should be set within VPN?

singhsaju · ‎09-15-2008

This could be a fragmentation issue . IPsec adds its own header to normal application data packets and

this could lead to packet size more than 1500 bytes.

Check out following links to adjust TCP MSS value on ASA:

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a008081e621.shtml

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a00804c8b9f.shtml

HTH

Saju

Pls rate helpful posts

mellowgb59 · ‎10-09-2008

The MSS size would affect all users. I am not having this issue with all users. I was wondering if anyone else has experienced this. If you have any other ideas please let me know.

Thanks.

ryan.terry · ‎10-08-2008

Did you ever find a solution to your problem?

I am experiencing the same issue.

mellowgb59 · ‎10-09-2008

No solution yet. I am still working on this issue.