does sftp connection closes by default if it stays idle for a prolonged time ?
i have checked sshd_config files , there is no time out value set. but still the connection closes after certain period of time.
Please help.
verbose mode output :
sftp> debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
Connection to [x.x.x.x] closed by remote host.
debug1: Transferred: stdin 0, stdout 0, stderr 53 bytes in 600.6 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.1
debug1: Exit status -1
Take a look at the ServerAliveInterval option to sftp\ssh.
Hope this helps.
oops. no such option in sshd_config file
pxb368
June 15, 2012, 1:11pm
4
Have a look here - OpenSSH FAQ
ok i need to try that out and see , i have one more query.
In the below output exit status is -1 and stderr 0.1 is this normal or any issues ?
because the sftp happens through a cron job and sometimes the sftp seems to fail.
sftp> debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
Connection to [x.x.x.x] closed by remote host.
debug1: Transferred: stdin 0, stdout 0, stderr 53 bytes in 600.6 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.1
debug1: Exit status -1
The destination server is out of network , and doesnt not allow ping , even ssh. only sftp works with a specific port number.
so we experience this connection drop at times and we need to find out why this happens.
pxb368
June 15, 2012, 1:56pm
6
That look likes an error, but I'm not sure what that is.
If there is a Firewall in the middle that doesn't allow SSH session, SFTP will not work. SSH File Transfer Protocol - Wikipedia, the free encyclopedia
SFTP uses Port 22.
-----------------------------edit
Sorry didn't see that you are using a specific port.
well we checked and they could not find any error. Problem is the sftp connection does not close always. it happens sometime in a day , doesnt have any pattern , but happens . We got a suggestion of using tcpdump to monitor the connectivity but ours is a solaris box. so i believe we have to go with snoop.
pxb368
June 15, 2012, 2:09pm
8
You can install tcpdump in solaris - tcpdump - Solaris package
sorry , we have to go with system utility snoop
so any help with using snoop on this issue , would be much appreciated.
You can try a simple capture between the two servers in question:
Start the capture:
snoop -o sftp.cap -d <network interface> server1 server2
CTRL-C to stop.
Read the results:
snoop -i sftp.cap -t r | more
Yes..If there is a firewall between client and server, sometimes it can disconnect due to FW settings. Firewall may be configured to drop Idle connections.
Charith