Problem in cygwin

Hi All,

I am using cygwin 2.697.
When i was working with LAN its working fine.
But when i am trying to working via ( Aventail Smart Tunnel), It close after 20 mins.
But Exceed-10 is working fine, but it take more resource and its not freeware.
so kindly help me in this regards.
I have a doubt, how Exceed is working? Is there is any addition features are included in Exceed?

check for session keep alives time outs and etc...that's could be the case...