I have some problems with some applications as Xcics and Citrix when client and server are connected through a vpn site-to-site. Clients don't seem to have any problem to connect to the server, but after a period of time, they disconnect even if users are working. Session is not closed correctly on server and stay hung, so users can't connect if the administrator doesn't close the session on the server. Some vpns pass through a Pix515E, others pass through a fwsm and an ASA5510. Does anyone knows something about this issue?