ssh connections being dropped

Gabriel Gunderson gabe at gundy.org
Sat Feb 11 20:38:56 MST 2006


Has anyone seen this before?  After about 10 mins (or so) my shh 
connection will be dropped.  It's only on one of many remote servers 
that I connected to.  I don't believe it's on my (client) side.  This 
particular server is running openssh-server-3.9p1-8.RHEL4.9  Logs show 
nothing.  Google yields nothing to my untrained eyes.  Possibly relevant 
info below.  Any ideas where to start on this one?


MESSAGE AS I'M DROPPED (ssh -vvv):
#####################################################################
[root at rms ~]# debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
   #0 client-session (t4 r0 i0/0 o0/0 fd 4/5 cfd -1)
debug3: channel 0: close_fds r 4 w 5 e 6 c -1
Read from remote host tbmhost.com: Connection reset by peer
Connection to tbmhost.com closed.
debug1: Transferred: stdin 0, stdout 0, stderr 96 bytes in 2274.4 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.0
debug1: Exit status -1


TCP TIMEOUT SETTING (stock CentOS 4 settings - works on other servers):
#####################################################################
cat /proc/sys/net/ipv4/tcp_keepalive_intvl
75
cat /proc/sys/net/ipv4/tcp_keepalive_probes
9
cat /proc/sys/net/ipv4/tcp_keepalive_time
7200


SSHD CONFIG:
#####################################################################
grep -v "#" /etc/ssh/sshd_config

Port 22
SyslogFacility AUTHPRIV
PermitRootLogin no
PasswordAuthentication yes
UsePAM yes
X11Forwarding no
TCPKeepAlive yes
Compression yes
Subsystem       sftp    /usr/libexec/openssh/sftp-server



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