I'm not clear on whether you are looking for server code (code that listens to a port and accepts connections) or code to install a windows service or both. For the former, perhaps search CPAN for RPC - lots of choices there. (Or just start from what's in perlipc.) For the latter, I see Win32::Daemon; there may be others, too.

Search for openssh for an open source sshd, but I'm not sure what that has to do with the rest of your question.

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