the server will bind to an address and start listening on it. the client socket is usually dynamically bound and tries to connect to the socket at the address the server has bound. so the port the client tries to connect to should be the same as the one the server used in the call to bind.
1234 is not an ideal choice for the port though. see

will this connection be established? can't say. the port may already be in use (for 1234, this is likely in windows), the connection may be blocked/dropped by a firewall etc.

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