I want to make simple demo in win form like "hello" send from client and server response back to that client. client <==> Server. duplex communication . client ,server both are on different network . I had try to use socket ,web socket. Signal R ,X socket , socket .but i could not resolve the issue of Firewall on client side. of course on localhost everything work fine LOL. i mean if client is behind firewall and firewall of client block ICMP traffic then connection fail with server. client can't initiate connection with server . client <==> firewall <==> proxy <==> Router <========> (Internet) <===> server ICMP traffic block mean client can't ping Google,yahoo,or any thing. but can access them. Client Router can disabled port forwarding trick also . as you know these days different type of router. i also did try to use port 80 but still fail . i wondering how skype working lol. Any way i don't want to any setting on client router or firewall etc.. note: I should use Window Form application . not Web . Please give me good trick to use which should faster ,secure and easy to implement. i'm looking forward your response . Thanks Advance .
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