Check these links hope this helps http://msdn.microsoft.com/msdnmag/issues/01/02/netpeers/ http://groups.google.com/group/microsoft.public.dotnet.languages.vb/browse\_thread/thread/d1e56ec3348d2c28/c28944653750b9ea?lnk=st&q=c%23+chat+behind+proxy&rnum=1&hl=en#c28944653750b9ea Plese let me know if it helps. If possible I will make a sample and send you this weekend.

hi, atleast tell what problem u r having. Regards

Hi nidheesh, I think that the problem could be that your use IP address rather then name of the server and also check if config in web.config is same as Hope this helps. Still send some detials of code too. Regards, Anil C

hi shabeer, If your application is only for LAN then TCP sockets is somethig that is genrally used. If you need your application to be used from Internet then this TCP socket will not work if you computer is behind a proxy. So It all depends what is the scope of your project. Also its better if you use synchronous communication for sosckets as you handle of all threads and can manage threading rather that using system threads when by using asynhronous communication. In short- TCP sockets will not work behind proxy. you need to have all you system with external IP if using tcp sockets. Regards, Anil:)