[CentOS] long delay when logging in

[Valeri Galtsev]

On Wed, November 16, 2016 5:07 pm, Larry Martell wrote:
> I have a CentOS 7 system and when I login with putty or ssh there is a
> long delay before I get the password prompt.

First thing I would check is that that system doesn't have unaccessible
DNS server listed in:

/etc/resolv.conf

(another thing, similarly DNS related: if you have caching name server on
that box, check if that doesn't cause delay the you see).

Valeri

> I ran ssh -v and I found
> that it gets up to this:
>
> debug1: ssh_ecdsa_verify: signature correct
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug1: SSH2_MSG_NEWKEYS received
> debug1: SSH2_MSG_SERVICE_REQUEST sent
> debug1: SSH2_MSG_SERVICE_ACCEPT received
>
> and then it sits there for 1-2 minutes and then this output blasts out:
>
> debug1: Authentications that can continue:
> publickey,gssapi-keyex,gssapi-with-mic,password
> debug1: Next authentication method: gssapi-keyex
> debug1: No valid Key exchange context
> debug1: Next authentication method: gssapi-with-mic
> debug1: Unspecified GSS failure.  Minor code may provide more information
> No Kerberos credentials available
> debug1: Unspecified GSS failure.  Minor code may provide more information
> No Kerberos credentials available
> debug1: Unspecified GSS failure.  Minor code may provide more information
> debug1: Unspecified GSS failure.  Minor code may provide more information
> No Kerberos credentials available
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/motor/.ssh/id_rsa
> debug1: Trying private key: /home/motor/.ssh/id_dsa
> debug1: Trying private key: /home/motor/.ssh/id_ecdsa
> debug1: Trying private key: /home/motor/.ssh/id_ed25519
> debug1: Next authentication method: password
>
> And then the password prompt comes out. This happens no matter which
> user is logging in. It only happens on the 1 system. I have 5 others
> where the proceeds without the delay.
>
> There are no disk or memory or any other errors in the logs.
>
>
> What could be causing it to delay like this?
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++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++