Reverse SSH: Permission denied, please try again.

[khurtsiya]

I have home laptop on 3G - client
I have sisters laptop on Wi-Fi router - target
I have dedicated server - middle

All on Ubuntu

I created tunnel from target to middle

ssh -R 7778:localhost:22 middleuser@middleIP

Then I connect to middle from client

ssh middleuser@middleIP

And from it to target

ssh targetuser@localhost -p 7778

But here I receive this errror: Permission denied, please try again.

I actually already have success connections today, but then I broke smth...

Please help where to look first?

TIA

[The Cog]

I think only root is allowed to tunnel privileged ports (under 1024). So you may need to ssh in as root@middleIp.

[khurtsiya]

But I've had success logins with this users...

[Lars Noodén]

I have home laptop on 3G - client
I have sisters laptop on Wi-Fi router - target
I have dedicated server - middle

If you connect from client to target via middle you can do it like this:

ssh -L 7778:target:22 middle

Then on client you can connect to port 7778 on the localhost. Or are you trying to make it so target can log into client?

[khurtsiya]

I've changed the port to 7779 and all works now!

Now I want automate. But tunnel works only if terminal not closed, why?

[Lars Noodén]

Try adding -fN to your options on the client when establishing the port forwarding. The -f drops ssh to the background and the -N tells it not to execute a remote command.

[khurtsiya]

when I add -fN and try to run it by clicking and selecting Run - nothing happens and I am not able to connect from middle - Connection refused - so I believe reverse tunnel not created

[Lars Noodén]

What happens when you run it from the terminal? What is the full line that you enter?

[khurtsiya]

When I run this from terminal I've god prompt: middleuser@middleserver:~$

sshpass -p password ssh -R 7779:localhost:22 middleuser@middleIP

and after this I can connect from client
but if I type exit followed by Enter key - I've got "logout" and it logs out when I close connection on client side
if i close terminal - connection closes on client side

[Lars Noodén]

Adding -fN like this should allow it to stay running after the terminal is closed:

sshpass -p password ssh -fNR 7779:localhost:22 middleuser@middleIP