Re: ssh hangs (openssh stop/start fixes problem)

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Date: Sat, 21 Feb 2004 13:27:40 -0500
To: "Spurgeon, John P" <john.p.spurgeon@intel.com>, <secureshell@securityfocus.com>

         I actually encountered this issue a few times on Freebsd. Turned
out it was a DNS issue. AKA the box couldn't resolve the name of the
machine connecting to it, or the machine it was on and thus hung. Sounds
like you've encountered a few DNS lookup issues. Although that may not be
the actual issue, that's usually what I've found to be at fault.

At 10:05 AM 2/21/2004 -0800, Spurgeon, John P wrote:
>Hi,
>
>I'm using openssh on Solaris 7 (Intel):
>
>% uname -X
>System = SunOS
>Release = 5.7
>KernelID = Generic_106542-27
>
>% ssh -V
>OpenSSH_3.7.1p1, SSH protocols 1.5/2.0, OpenSSL 0.9.7b 10 Apr 2003
>
>This morning I was trying to make a connection using ssh. The ssh
>program would just sit there doing nothing. I tried ssh with the -v
>option, which showed me that the program wasn't getting very far before
>it would hang:
>
> % ssh -v username@hostname
> OpenSSH_3.7.1p1, SSH protocols 1.5/2.0, OpenSSL 0.9.7b 10 Apr
>2003
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: /etc/ssh/ssh_config line 28: Deprecated option
>"RhostsAuthentication"
>
>It did the same thing no matter what account I was using or what system
>I was trying to connect to (including making a connection back to the
>local host). In contrast, telnet worked fine. I tried sending a hangup
>signal to the sshd process (the one with ppid=1) but that didn't work.
>Finally, I stopped and restarted the daemon using /etc/init.d/openssh:
>
>/etc/init.d/openssh stop
>/etc/init.d/openssh start
>
>That fixed the problem.
>
>I've been using openssh on our development/test servers for several
>months. I've only run into this issue twice. But both instances occurred
>recently within a day of building the server.
>
>Does anyone know what might be going on?
>
>John

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