How can I bind TCPListener to an external IP address?

Your application should bind only to the internal IP address on the machine. The problem is that the firewall does not automatically pass the external IP address through to the internal IP address via Port Forwarding. Since you cannot easily modify the firewall configuration, there are 3 alternatives.

That exception typically occurs when you are trying to bind to an address that is not valid on the machine. Is the IP you are trying to bind to assigned to one of the network interfaces on the machine?

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