topic Re: SSH pty allocation error in Operating System - HP-UX

SSH pty allocation error

William Allen — Wed, 18 Apr 2007 11:27:05 GMT

We are running hpux 11.11. We have installed A.04.40.006 HP-UX Secure Shell.

We can get a secure X session but receive the following when attempting to use Putty:

sshd[231]: error: openpty: Bad file number
sshd[231]: error: session_pty_req: session 0 alloc failed

Anybody have any ideas?

Re: SSH pty allocation error

Patrick Wallek — Wed, 18 Apr 2007 11:31:42 GMT

What are the kernel parameters npty and nstrpty set to? How many people are logged in? It is possible that you are running out of pty's.

You may need to increse the value of npty and nstrpty, regen the kernel and reboot.

Re: SSH pty allocation error

William Allen — Wed, 18 Apr 2007 11:35:56 GMT

npty 80 - 80
nstrpty 60 - 60

We currently only have about four users accessing the system so I don't think we are running out of sessions.

Re: SSH pty allocation error

William Allen — Wed, 18 Apr 2007 11:59:14 GMT

Re: SSH pty allocation error

Sandman! — Wed, 18 Apr 2007 13:31:09 GMT

You might be out of swap space per this thread:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=985446

~hope it helps

Re: SSH pty allocation error

William Allen — Wed, 18 Apr 2007 13:34:14 GMT

# swapinfo -mat
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol2
dev 8192 0 8192 0% 0 - 0 /dev/vg00/swap2vol
reserve - 6108 -6108
memory 11625 3423 8202 29%
total 23913 9531 14382 40% - 0 -

Don't think that's the problem either.

Re: SSH pty allocation error

Sandman! — Wed, 18 Apr 2007 16:05:51 GMT

Enable loging within Putty and then try connecting via ssh. Look at the system log also for any ssh-related error messages.