Side comment: you are missing the #lang line and requires, so
technically the code you have above is ambiguous. Don't omit those
next time.
tcp-connect from another machine opens up a port, like the other
port-opening functions for files. What issue are you encountering
with tcp-connect? I would expect
(tcp-connect <the-ip-address-of-your-server> 9999)
to produce input and output ports to communicate to the server. Are
you not seeing this?
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