i was first try the server chat sample , it worked fine. the i downloaded Rummy example, the server can run but dashboard showing no info of CCU, and the client demo can't connect to the server. So it seems that it is limit to try 1 sample only per PC, then how can i test other sample?
closed with the note:
i found the solution that using my public IP on server side to connect rather than using localhost or 127.0.0.1