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How to verify if SFTP is enabled in a UNIX box .

Posted on 2012-03-09
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Hi,

I am trying to establish a connection via SFTP from a UNIX to a ip and I get the below error . The ip is valid and the firewall is also opened up from the ip . Is there a way to identify if there is an issue in the source UNIX box .

java.net.SocketException: Connection timed out:could be due to invalid address
com.jcraft.jsch.JSchException: java.net.SocketException: Connection timed out:co
uld be due to invalid address
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Question by:FranklinRaj22
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by:StuWhitby
ID: 37703504
ps -ef | grep ftp should tell you if it's running.  I'd expect to see sftpd or ftpd or similar.

You should also be able to telnet to the port.  Also, since it's complaining about the address rather than the port (though it does show as a socket exception), check that the address itself is reachable via ping or traceroute.  

It's unlikely that the issue is in the source box.  Check basic networking though by trying external websites (or websites on the same domain as you're trying to ftp to).
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Tintin earned 1000 total points
ID: 37703630
StuWhitby, sftp doesn't run as a daemon, it is a sub-system of ssh.

Try connecting on the command line rather than through your Java app, eg:

sftp user@ip
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by:omarfarid
ID: 37704065
Can you login to the unix server? if yes then:

the server ip is ok, and if you use ssh then you should not have a problem using sftp since it runs on the same port of ssh.

If you are able to login to the unix server by some other means, then try this command from command prompt on the unix box

sftp 0

if you can not reach the unix box then it could be a network issue. It could be routing. check routing on your system and on the unix box.
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by:Gerwin Jansen, EE MVE
ID: 37704329
Just checking whether sftp is 'enabled' is just a matter of typing 'sftp' on from a shell prompt. What kind of UNIX do you have btw? Are you able to connect to the ip address from your UNIX box using 'telnet' for example? Try 'telnet <ip address>' and 'ping <ip address>' to see if your destination is reachable.
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by:hossamshaaban
hossamshaaban earned 1000 total points
ID: 37704761
svcs -a|grep sshd
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by:Tintin
ID: 37705512
hossamshaaban, no mention of Solaris was made anywhere in this thread.

Additionally, having sshd running, doesn't mean the sftp subsystem is enabled.

Also, having sshd running on your local server doesn't have any bearing on whether you can connect to a remote server.
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by:hossamshaaban
ID: 37705744
sftp is inserted module in SSH, so when SSH is enabled SFTP should be enabled also by default.
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by:Tintin
ID: 37705913
SFTP is only enabled if it is defined in /etc/ssh/sshd_config, eg:

Subsystem sftp /usr/lib/openssh/sftp-server
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by:hossamshaaban
ID: 37706418
yes, that  mean and i think my reply show that and this line is exist by default.
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by:Gerwin Jansen, EE MVE
ID: 37707546
@FranklinRaj22 - Any progress from your side worth mentioning?
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