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I have some old unix running as vm on VirtualBox server those vm had the serial ports simulated by unix socket for example: an old AT&T 2.1 SVr4 has socket on /tmp/att1 to connect i did

minicom -D unix#/tmp/att1

on server.

I heard somewhere ssh can connect to unix sockets. How to do?

I have tried

socat TCP-LISTEN:5500 EXEC:'ssh user@server "socat STDIO UNIX-CONNECT:/tmp/att1"'

Then 

ssh server -p 5500

But give me error

ssh_dispatch_run_fatal: Connection to 192.168.0.2: message authentication code incorrect

Also tried

ssh -R/tmp/att1:/tmp/att1 -R127.0.0.1:1233:/tmp/att1

But failed with remote port failed error.

Suggestions?

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  • no, you can't connect using ssh to UNIX domain socket simulating serial console. You would need SSHD server on the other side and your machines probably pre-dates the whole protocol. You got it probably confused by the forwarding of UNIX domain socket.
    – Jakuje
    CommentedDec 21, 2015 at 22:40
  • Yes right,the only possibility to get ssh via serial is a server wich run sshd and translate/connect tcp-connection to serial connection,wich the client see transparent as a normal tcp connection. A hw thing like this exist,is called "terminal server". A sw solution will be good imho.If you want to get your comment voted,add it as answer,i will close question
    – elbarna
    CommentedDec 22, 2015 at 0:39

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No, you can't connect using ssh to UNIX domain socket simulating serial console. You would need SSHD server on the other side and your machines probably pre-dates the whole SSH protocol.

You got this probably confused by the forwarding of UNIX domain socket, which is possible as port-forwarding.

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  • Could you run sshd on the other side of the serial line in inetd mode somehow? I can't think of any reason why that wouldn't work aside from not being certain how to attach it to the virtual serial port...
    – Perkins
    CommentedMay 28, 2021 at 0:05

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