When you use a program that tries to bind to TCP network ports on a Windows-based computer, you may receive the following Winsock error message:

WSAEADDRINUSE (10048) Only one usage of each socket address (protocol/network address/port) is normally permitted.

This behavior occurs if the following conditions are true:

• Internet Connection Sharing is enabled on the computer that is running Windows.
• The program tries to connect to TCP ports in the 5001 to 5032 range.