[c#] How do I fix the error "Only one usage of each socket address (protocol/network address/port) is normally permitted"?

ListenForClients is getting invoked twice (on two different threads) - once from the constructor, once from the explicit method call in Main. When two instances of the TcpListener try to listen on the same port, you get that error.

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How do I fix the error "Only one usage of each socket address (protocol/network address/port) is normally permitted"? How many socket connections can a web server handle?