How to exit from SSH session on GS1900-8HP?

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  • Zyxel_Melen
    Zyxel_Melen Posts: 2,579  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @zymat6816,

    To test, I made a SSH session with Putty: after a succesfull login I typed 'exit' command which made the session "inactive", but did not close the window as it normally does.

    May I know which putty version are you using? I will check this issue in my lab with putty again.

    Zyxel Melen


  • zymat6816
    zymat6816 Posts: 8  Freshman Member
    First Comment

    I tried with:
    Putty: release 0.78
    and
    Kitty: version 0.76.0.8
    Both produce similar results, none of them closes the session as it is supposed to.

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,579  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    edited November 29

    Hi @zymat6816,

    EDIT:

    Thanks for your update. We did some SSH tests and the putty popped out the error message. But the session won't connect back if I type any key (like space). Did you use the console to connect the GS1920?

    By the way, we are investigating why putty popped out the error message and I will keep you posted.

    Zyxel Melen


  • Zyxel_Melen
    Zyxel_Melen Posts: 2,579  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    edited November 29

    Hi @zymat6816,

    I also want to check what Linux OS and version you use that caused "packet_write_wait: Connection to x.x.x.x port 22: Broken pipe <IP removed>"?

    Zyxel Melen


  • zymat6816
    zymat6816 Posts: 8  Freshman Member
    First Comment

    Hi,

    I get "broken pipe" from older linux:
    Raspbian GNU/Linux 10 (buster) and CentOS Linux 7 (Core), etc.

    I get proper disconnect from:
    Windows Powershell and Windows Command prompt, with message:
    client_loop: send disconnect: Connection reset
    Also on newer Debian GNU/Linux 12 it is OK, with message:
    "client_loop: send disconnect: Broken pipe"

  • peos42
    peos42 Posts: 18  Freshman Member
    First Comment Friend Collector
    edited December 3

    This happens to other Zyxel switches as well. Exit ssh from a Zyxel GS1930-12HP works ok but exits with (connected with OpenSSH client on FreeBSD):

    switch0.incedo.org> exit
    client_loop: send disconnect: Broken pipe
    vader@xanadu:~ #

    Exiting from a SSH on an ArubaOS it says (connected with OpenSSH client on FreeBSD):

    ap3.incedo.org (hallway)# exit
    Connection to ap.incedo.org closed.
    root@xanadu:~ # 


    Exit from a linux server (connected with SSH client on MacOS Sequoia):

    [sjoholmp@apollo ~]$ exit
    logout
    Connection to apollo.incedo.org closed.
    peo-M3Pro:~ sjoholmp$

    Behaves exactly the same with all SSH clients…

    Ok, ssh exits from the Zyxel switch (i.e no hang) so I do not care as it won't affect the switch or my work. But something is not correct and should be adressed in ZynOS in an upcoming update. Probably just "run user" rights and/or SSH settings in ZynOS for the SSH service… So probably not a biggie. Should be easily resolved if looked into.

    //Peo

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,579  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @zymat6816,

    Thanks for the information.

    In addition, we try to reproduce the putty reconnect issue but the session won't connect back if I type any key (like space). Did you use the console to connect the GS1920? Or could you record a video for us to clarify it? Thanks.

    Zyxel Melen


  • zymat6816
    zymat6816 Posts: 8  Freshman Member
    First Comment

    I apologise for late reply.
    Actually it was not putty but a fork of putty called kitty, latest version: kitty-0.76.1.13.exe
    You should not pay too much attention to this client.

  • Zyxel_Melen
    Zyxel_Melen Posts: 2,579  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate
    edited December 12

    Hi @zymat6816,

    Thanks for your update~

    Just to clarify, is the exit command causing Putty not to close the session window not an urgent issue for you?

    In addition, we also found that if use putty 0.7.0, the putty window will be closed after entering the exit command. The pop-out error message seems to only occurs on putty 0.7.4 and after versions.

    Zyxel Melen


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