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Thread: Reverse SSH: Permission denied, please try again.

  1. #1
    Join Date
    Jul 2008
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    204
    Distro
    Ubuntu 11.10 Oneiric Ocelot

    Exclamation Reverse SSH: Permission denied, please try again.

    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

    Code:
    ssh -R 7778:localhost:22 middleuser@middleIP
    Then I connect to middle from client

    Code:
    ssh middleuser@middleIP
    And from it to target

    Code:
    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

  2. #2
    Join Date
    Nov 2007
    Location
    London, England
    Beans
    5,492
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: Reverse SSH: Permission denied, please try again.

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

  3. #3
    Join Date
    Jul 2008
    Beans
    204
    Distro
    Ubuntu 11.10 Oneiric Ocelot

    Re: Reverse SSH: Permission denied, please try again.

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

  4. #4
    Join Date
    Sep 2006
    Beans
    7,369
    Distro
    Lubuntu Development Release

    Re: Reverse SSH: Permission denied, please try again.

    Quote Originally Posted by khurtsiya View Post
    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:

    Code:
    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?

  5. #5
    Join Date
    Jul 2008
    Beans
    204
    Distro
    Ubuntu 11.10 Oneiric Ocelot

    Re: Reverse SSH: Permission denied, please try again.

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

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

  6. #6
    Join Date
    Sep 2006
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    7,369
    Distro
    Lubuntu Development Release

    Re: Reverse SSH: Permission denied, please try again.

    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.

  7. #7
    Join Date
    Jul 2008
    Beans
    204
    Distro
    Ubuntu 11.10 Oneiric Ocelot

    Re: Reverse SSH: Permission denied, please try again.

    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

  8. #8
    Join Date
    Sep 2006
    Beans
    7,369
    Distro
    Lubuntu Development Release

    Re: Reverse SSH: Permission denied, please try again.

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

  9. #9
    Join Date
    Jul 2008
    Beans
    204
    Distro
    Ubuntu 11.10 Oneiric Ocelot

    Re: Reverse SSH: Permission denied, please try again.

    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

  10. #10
    Join Date
    Sep 2006
    Beans
    7,369
    Distro
    Lubuntu Development Release

    Re: Reverse SSH: Permission denied, please try again.

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

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

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