[plug] ssh "pause"

Lance Duivenbode plug at duivenbode.id.au
Thu May 15 11:48:18 WST 2008

Hi Jason,

I'm not sure if this is applicable, but below is an email I posted to the PLUG 
list when I was undergoing similar problems.



Hi all,

Just thought I'd share this as it frustrated the heck out of me until I 
dug deeper. With a fresh install of Kubuntu Feisty, I had the problem 
where every SSH connection sat waiting for around 12 - 20 seconds before 
asking me for the password. Using the -vvvvv option, it appeared that it 
was a DNS issue even though the address specified was an IP. Whilst this 
didn't make any sense, I thought I'd at least give it a try and so I 
modified the nsswitch settings in /etc/nsswitch.conf and changed the line:

    hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4


    hosts:          files dns

Alas, no dice. The real culprit was the /etc/ssh/ssh_config file (which 
specifies ssh client config for those not in the know) which contained 
the following lines:

    GSSAPIAuthentication yes
    GSSAPIDelegateCredentials no

Commenting these lines out made the problem disappear as it prevented an 
apparent attempted kerberos lookup, which was in turn requesting a 
reverse DNS lookup.

Hope this saves someone else a headache!


On Thursday 15 May 2008 08:21:37 Jason wrote:
> greetings all,
> after the hard drive on my laptop went chernobyl (thankfully under
> warranty) I had to install debian from scratch.
> I've noticed that since this fresh install, when sshing from my server to
> my laptop (both whilst physically sitting @ the server or sshing in to the
> server from work) there is quite a pause before the password prompt
> appears.  on the previous install (approximately 2 years old) it was almost
> instantaneous.
> any suggestions?
> cheers,
> jason.
> _______________________________________________
> PLUG discussion list: plug at plug.org.au
> http://www.plug.org.au/mailman/listinfo/plug
> Committee e-mail: committee at plug.linux.org.au

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