I run into this all the time. But I can't tell from your config and description if it is exactly the same.
What programs did you run (or what services did you start) before exiting? I don't suspect the TCPKeepALive. (Since you're trying to drop back to the intermediate host.) More likely, something is holding a file descriptor open on the remote end. Could be "stdout" from a background process, for example. (This is what I get: a background process or helper program continues to run.) I hope this helps. -- R; Rick Troth Velocity Software http://www.velocitysoftware.com/ On Tue, Apr 24, 2012 at 4:55 PM, Mauro Souza <thoriu...@gmail.com> wrote: > Hi guys! > > I've got a strange unseen problem on a sles11 sp2 today, and even Google > couldn't help me. I connect to the machine, but when I issue an exit, ssh > does not closes the connection. I have to connect to a gateway machine > before I can connect to the guest: > > me ----> linuxgw -----> strange_ssh > > But as soon as I execute an 'exit' or a 'logout' or ^D, the screen hangs. > It hangs the microsecond I press enter. I have to use the '~.' escape > sequence to close the now dead connection from strange_ssh and return to > linuxgw. > > I started two connections to see if the exit is being processed, and it is: > > Before the exit: > strange_ssh:~ # w > 17:48:03 up 4 min, 2 users, load average: 0.00, 0.00, 0.00 > USER TTY LOGIN@ IDLE JCPU PCPU WHAT > root pts/1 17:44 35.00s 0.05s 0.05s -bash > root pts/2 17:47 0.00s 0.03s 0.00s w > > Then I issue an exit, and the term hangs: > > strange_ssh:~ # w > 17:48:48 up 4 min, 1 user, load average: 0.00, 0.00, 0.00 > USER TTY LOGIN@ IDLE JCPU PCPU WHAT > root pts/2 17:47 0.00s 0.03s 0.00s w > > pts/1 is killed, but my terminal shows this (and is dead): > strange_ssh:/etc/ssh # exit > > Some 20 seconds later, I see a logout, and the message saying that I has > been disconnected. > > The question is: how to change this 20 second timeout to something faster, > as I always see everywhere? > > This is my sshd_config file (almost all default, I only changed UseDNS and > TCPKeepALive): > Protocol 2 > PasswordAuthentication no > GSSAPIAuthentication no > UsePAM yes > AllowTcpForwarding yes > X11Forwarding yes > TCPKeepAlive yes > UseDNS no > Subsystem sftp /usr/lib64/ssh/sftp-server > AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY > LC_MESSAGES > AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT > AcceptEnv LC_IDENTIFICATION LC_ALL > > > Thanks! > > Mauro > http://mauro.limeiratem.com - registered Linux User: 294521 > Scripture is both history, and a love letter from God. > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ -- -- R; Rick Troth Velocity Software http://www.velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
