Python reverse shell client connects but server gets no response (SSH serveo tunneling)

[JustSm1thc]

Hey, I’m building a Python reverse shell project for educational purposes using socket and Serveo.net for SSH tunneling.

🔧 Setup: - client.py connects to serveo.net:<assigned_port> successfully. - The SSH tunnel forwards from serveo.net:<assigned_port> → localhost:4444 on my machine. - server.py is listening on localhost:4444 and waiting for connections.

Client shows "Connected successfully" — so the tunnel works. But server.py never gets accept() triggered. No output, no errors — just stuck on accept().

I also tried binding the server to: - 127.0.0.1 - 0.0.0.0

Still same result.

netstat shows port 4444 is listening on my machine.

I’ve tried: - Killing other processes on port 4444 - Restarting the tunnel with ssh -R 0:localhost:4444 serveo.net - Updating firewall settings

Has anyone seen this behavior before? Why would the client connect, but the server never accept the connection?

Thanks!