topic Re: very slow when logging in to Rehat Linux in Operating System - Linux

very slow when logging in to Rehat Linux

senthil_kumar_1 — Thu, 23 Jul 2009 14:24:59 GMT

Hi All,

I am using putty tool to login to Redhat linux thru SSH.

We are using lot of Redhat linux server, but in one of Redhat linux servers, it is delaying long (>30secs) to get the password prompt after enter the user name in login prompt.

Why there is delay between login prompt and password prompt even after login name entered.

how to solve this.

Re: very slow when logging in to Rehat Linux

Steven E. Protter — Thu, 23 Jul 2009 15:52:35 GMT

Shalom,

1) Take a look at /var/log/messages

2) Docs
http://bowen.blog.51cto.com/136148/100456

Almost always the logs tell the tail.

SEP

Re: very slow when logging in to Rehat Linux

John Poff — Thu, 23 Jul 2009 15:53:23 GMT

Hi,

One thing to check is the DNS resolution on that Linux box. I have seen that problem before when name resolution wasn't configured correctly on a Linux box and SSH couldn't do a reverse lookup on the hostname when someone was trying to start a session. It times out after 30 seconds and then allows the login.

JP

Re: very slow when logging in to Rehat Linux

Sivakumar MJ._1 — Mon, 27 Jul 2009 12:42:10 GMT

Senthil,

Mostly its a DNS issue..

Check the /etc/ssh/sshd_conf set

UseDNS no

or

#UseDNS yes

does it therefore assume no?

Re: very slow when logging in to Rehat Linux

Steven E. Protter — Mon, 27 Jul 2009 14:14:07 GMT

Shalom,

I misinterpreted this issue.

Add a line to /etc/hosts

IP address and named hostname(s) being used to log in.

That will solve this problem.

See that /etc/nsswitch.conf uses files before DNS.

SEP