Cannot SSH to Sles11sp1 Server

SUSE Linux Enterprise Server SLES Configure-Administer
1

Hello,

I recently setup a Sles11sp1 server on a VM session. The problem is I cannot SSH to it. The server has network connectivity. I can ping the gateway. I can ssh to other servers on the same subnet. I checked SSHD and it is running. The server is listening on port22. Remote Administration is turned on. Any suggestions?

Scott

2

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Is the firewall allowing connections to TCP 22? A service may listen,
but the kernel does not need to allow packets to arrive. From another
Linux box try this to test connectivity to the SSH service on your
broken box:

netcat -zv broken.box.goes.here 22

Post the output. We’re looking for it to say ‘open’ in which case the
next step may be to get debugging output from an SSH client:

ssh -vvv youruserhere@broken.box.goes.here

Good luck.
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3

Hi
Check the firewall (via YaST) and ensure the sshd server port is open.
Else add some verboseness to you ssh command and post the output around
code tags (remove any sensitive data…)

ssh -vv username@host

–
Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel 3.0.31-0.9-default
up 1 day 10:01, 3 users, load average: 0.20, 0.20, 0.22
CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU

4

On 14/06/2012 14:04, sjfast911 wrote:
[color=blue]

I recently setup a Sles11sp1 server on a VM session. The problem is I
cannot SSH to it. The server has network connectivity. I can ping the
gateway. I can ssh to other servers on the same subnet. I checked SSHD
and it is running. The server is listening on port22. Remote
Administration is turned on. Any suggestions?[/color]

When you set up the server did you allow SSH through the firewall? By
default, the SSH port is blocked. See step 12 @
http://www.suse.com/documentation/sles11/book_quickstarts/data/sec_sles_installquick.html

HTH.

Simon
Novell/SUSE/NetIQ Knowledge Partner

Do you work with Novell technologies at a university, college or school?
If so, your campus could benefit from joining the Novell Technology
Transfer Partner (TTP) program. See TTP Organization | Micro Focus for more details.

5

The firewall is turned off. Here are the results from the netcat:

pwausoinf06:~ # netcat -zv 10.139.248.191 22
Warning: forward host lookup failed for pwausosmt201.app.hscint.net: Unknown host : No such file or directory

Thanks
Scott

6

That was it. Thanks for the help!!

Scott

7

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Apparently not, per your other post. I’m glad opening that port fixed it.

Good luck.
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8

Well I guess there is more than one place to turn off the firewall. Cause I checked the area where you turn on/off Remote Administration and there is an option in that area to turn off the firewall. It said disabled. But afer reading his suggestion and looking at the documentation I did a search for Firewall in Yast. Which it was not turned off. So I turned it off. Now I know what to check for.

Scott

9

On 15/06/2012 16:44, sjfast911 wrote:
[color=blue]

Well I guess there is more than one place to turn off the firewall.
Cause I checked the area where you turn on/off Remote Administration and
there is an option in that area to turn off the firewall. It said
disabled. But afer reading his suggestion and looking at the
documentation I did a search for Firewall in Yast. Which it was not
turned off. So I turned it off. Now I know what to check for.[/color]

Instead of turning off the firewall add the SSH service (port 22) to the
list of allowed services in the firewall. See
http://www.suse.com/documentation/sles11/book_security/data/sec_fire_suse.html
for more information.

HTH.

Simon
Novell/SUSE/NetIQ Knowledge Partner