Find the answer to your Linux question:
Results 1 to 4 of 4
I'm using Ubuntu 8.04 with thin clients at an elementary school. When a student types in the wrong password (which happens often), it takes over 2 minutes to get the ...
Enjoy an ad free experience by logging in. Not a member yet? Register.
  1. #1
    Just Joined!
    Join Date
    Feb 2009
    Posts
    4

    pam_unix(sshd:auth): conversation failed


    I'm using Ubuntu 8.04 with thin clients at an elementary school. When a student types in the wrong password (which happens often), it takes over 2 minutes to get the login screen back. This is very irritating. This is an excerpt from my auth.log.

    Feb 21 13:24:31 edvs sshd[28103]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.102.103 user=ecorpsys
    Feb 21 13:24:33 edvs sshd[28096]: error: PAM: Authentication failure for ecorpsys from 192.168.102.103
    Feb 21 13:25:01 edvs CRON[28120]: pam_unix(cron:session): session opened for user root by (uid=0)
    Feb 21 13:25:01 edvs CRON[28120]: pam_unix(cron:session): session closed for user root
    Feb 21 13:26:26 edvs sshd[28108]: pam_unix(sshd:auth): conversation failed
    Feb 21 13:26:26 edvs sshd[28108]: pam_unix(sshd:auth): auth could not identify password for [ecorpsys]
    Feb 21 13:26:26 edvs sshd[28108]: error: ssh_msg_send: write
    Feb 21 13:26:36 edvs sshd[28181]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.102.103 user=ecorpsys
    Feb 21 13:26:38 edvs sshd[28171]: error: PAM: Authentication failure for ecorpsys from 192.168.102.103
    Feb 21 13:26:38 edvs sshd[28183]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.102.103 user=ecorpsys
    Feb 21 13:26:40 edvs sshd[28171]: error: PAM: Authentication failure for ecorpsys from 192.168.102.103
    Feb 21 13:26:40 edvs sshd[28184]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.102.103 user=ecorpsys
    Feb 21 13:26:42 edvs sshd[28171]: error: PAM: Authentication failure for ecorpsys from 192.168.102.103
    Feb 21 13:26:42 edvs sshd[28171]: Failed keyboard-interactive/pam for ecorpsys from 192.168.102.103 port 54295 ssh2
    Feb 21 13:26:42 edvs sshd[28171]: Failed password for ecorpsys from 192.168.102.103 port 54295 ssh2
    Feb 21 13:26:42 edvs last message repeated 2 times

    Why is there 2 minutes interval between the first authentication failure and the "conversation failed" message and what does that mean.

    Thank you
    Kraig Ellis

  2. #2
    Linux User dxqcanada's Avatar
    Join Date
    Sep 2006
    Location
    Canada
    Posts
    259

    Thumbs up

    /etc/ssh/sshd_config

    LoginGraceTime

    The server disconnects after this time if the user has not successfully logged in. If the value is 0, there is no time limit. The default is 120 seconds.



    Men occasionally stumble over the truth,
    but most of them pick themselves up
    and hurry off as if nothing had happened.

    Winston Churchill


    ... then the Unix-Gods created "man" ...

  3. #3
    Just Joined!
    Join Date
    Feb 2009
    Posts
    4

    Thank you

    Thank you so much. I'm definitely still learning.
    Kraig

  4. #4
    Just Joined!
    Join Date
    Feb 2009
    Posts
    4

    Still having problem

    After changing the timer in sshd_conf, The time changed between the time the auth failure first occurred and the time the conversation failure occured. But the overall time between entering the wrong password and being able to re-enter the password is still just over 2 minutes. This does not happen if logging in from the console or if logging in remotely. This only happens logging in from a thin client.
    What is going on here?
    Thanks
    Kraig

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •