Hey list,
I've read the man page for both the client and server daemon, so either
I missed something or this isn't an SSH issue but something going on
with perhaps routers or MTUs.
I am having problems with already established connections to a remote
server timing out after a few minutes. I connect either over ssh or via
rsync tunnelled over the former.
On the client side eventually I just see a whole pile of messages like
this, but no rsync traffic appears occurring:
debug1: client_input_channel_req: channel 0 rtype keepalive@ope
nssh.com reply 1
I've monitored both the client and server via strace and neither
machine appears to have "died" from some kind of memory exhaustion,
bandwidth issue, etc. Both appear to simply be waiting for the other to
do something.
Since my client side rsync is running as root, I tried to modify
/etc/ssh_config to try and keep the connection alive. This is the
client side /etc/ssh_config
Host *
ServerAliveInterval 5
ServerAliveCountMax 20
And this is the server side /etc/sshd_config:
Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
UsePrivilegeSeparation yes
KeyRegenerationInterval 3600
ServerKeyBits 768
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile %h/.ssh/authorized_keys
IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes
UseDNS no
ClientAliveCountMax 20
ClientAliveInterval 5
The latter two options I'm assuming are the most important here, but
they don't seem to do anything.
Any help appreciated.
--
Kip Warner | Senior Software Engineer
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