Quote:
what's wrong?
The error message tells you What is the problem
Quote:
Could not connect to net.tcp://localhost:1234/Chat/ChatService.
and why
Quote:
No connection could be made because the target machine actively refused it 127.0.0.1:1234.
Do you have a firewall ?
Have you allowed your program to communicate with outside via a tcp/ip port ? Particularly, is it allowed to listen a port ?
What is your OS ?