Question

Linux SSH Question

Asked by: akshah123

I am running 2 Dell R900 Servers and i have a problem when i ssh from one to the other. Exaple when i ssh in and run a top command it hangs and nothing happens. If its done from any other server it works.Only these 2 servers are not working between them.
what can it be both servers have firewall off. They are also on the same subnet.

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Asked On
2009-09-15 at 09:18:57ID24733450
Topics

Linux Setup

,

Linux Networking

Participating Experts
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Answers

 

by: brutuzPosted on 2009-09-15 at 09:40:35ID: 25336772

do ssh -vvvv [login]

see where it stops..

 

by: nabeelmoiduPosted on 2009-09-15 at 10:32:17ID: 25337229

any differences in the sysctl parameters?

 

by: akshah123Posted on 2009-09-15 at 10:42:09ID: 25337329

debug3: packet_send2: adding 64 (len 57 padlen 7 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Entering interactive session.
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 0
debug3: tty_make_modes: ospeed 38400
debug3: tty_make_modes: ispeed 38400
debug3: tty_make_modes: 1 3
debug3: tty_make_modes: 2 28
debug3: tty_make_modes: 3 127
debug3: tty_make_modes: 4 21
debug3: tty_make_modes: 5 4
debug3: tty_make_modes: 6 0
debug3: tty_make_modes: 7 0
debug3: tty_make_modes: 8 17
debug3: tty_make_modes: 9 19
debug3: tty_make_modes: 10 26
debug3: tty_make_modes: 12 18
debug3: tty_make_modes: 13 23
debug3: tty_make_modes: 14 22

 

by: nabeelmoiduPosted on 2009-09-15 at 10:45:59ID: 25337366

that's it ?

how many vvv did u put ?

 

by: akshah123Posted on 2009-09-15 at 11:28:21ID: 25337763

it stops at debug2: callback start

 

by: nabeelmoiduPosted on 2009-09-15 at 11:43:18ID: 25337915

does this happen both ways ?



 

by: akshah123Posted on 2009-09-15 at 12:03:52ID: 25338108

Yes

 

by: NopiusPosted on 2009-09-15 at 15:31:58ID: 25340291

run 'strace -o /tmp/top_log.txt top' wait 20-30 seconds, stop 'top' and open your logfile or send it here for analysis.

 

by: mburdickPosted on 2009-09-15 at 18:36:20ID: 25341109

I've had similar issues in the past where screen output doesn't seem to function properly.

Check the protocol settings on each of the servers and compare it to the client capabilities on the local client as well as the "other" clients. It's entirely possible that you're having a protocol or capability negotiation problem.

You could also try hard-coding the protocols in the server capabilities, or even specifying certain protocol settings or other capabilities on the ssh client command line when connecting to see if it changes anything.

 

by: akshah123Posted on 2009-09-18 at 11:40:54ID: 25368691

Issue resolved moved it to different subnet.

20120131-EE-VQP-002

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