0

Let's assume the following hosts:

localhost : my laptop 
remoteserver : a server with a public IP which runs a SSH server on port 22. (remoteserver ip for example 194.152.16.111) 
private.remoteserver ssh on port 2255: a server with a private IP which is only accessible from remoteserver. (private.remoteserver ip for example 194.152.16.222

)

I want to create ssh tunnel that I can connect to private.remoteserver from my laptop threw remoteserver

I tryed this

ssh -L 2255:194.152.16.222:2255 admin@194.152.16.111

and then from laptop

ssh localhost:2255

but does not work. What I am doing wrong?

2

The easiest to do what is called "multi hop ssh" and connect from host A via host B to host C is with the ProxyJump command switch -J available in newer ssh versions:

 ssh -J userB@hostB:portB userC@hostC:portC

where the port numbers are only needed when a port number different from the default ssh port 22, is used.

Or with scp

 scp -o 'ProxyJump userB@hostB' localfile userC@hostC:/remote/path/
  • Thank you but I am getting this error now: channel 0: open failed: administratively prohibited: open failed stdio forwarding failed ssh_exchange_identification: Connection closed by remote host – senzacionale Dec 20 '18 at 9:20
  • To debug add one or more -v flags and check the server logs first on hostB and then on hostC for possible causes of your error message. - What I suggested may be impossible when the intermediate server hostB is configured with for instance PermitOpen none – HBruijn Dec 20 '18 at 9:30
  • Thank you. Looks like that i can not specify port 2255 debug1: channel_connect_stdio_fwd xxx:2255:22 debug1: channel 0: new [stdio-forward] debug1: getpeername failed: Bad file descriptor debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: pledge: network debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0 channel 0: open failed: administratively prohibited: open failed – mbrc Dec 20 '18 at 9:48
  • I add -p now for port but does not ask me for password .... – mbrc Dec 20 '18 at 9:51
0

You can put this in your ~/.ssh/config

Host <internal.ips>
    Proxycommand ssh -C -W %h:%p -q -A <public server ip>

just make sure internal.ips are accessible from the public server.

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