Re: [CentOS] trouble shooting slow ssh logins

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From: "aurfalien@gmail.com" aurfalien@gmail.com To: CentOS mailing list centos@centos.org Sent: Thu, 21 January, 2010 20:07:27 Subject: Re: [CentOS] trouble shooting slow ssh logins

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aurfalien@gmail.com wrote:

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Hi all,

I noticed that my ssh logins to a particular server were taking up to 5 seconds to finally login.

This is frequently a DNS issue, is forward+reverse DNS functional?

DNS was normal, forward reverse lookups exist and match that host.

Is the server able to to reverse lookups on the IP address of the incoming client?

A day or two ago post a suggestion to use UseDNS No in the sshd config file (from memory), which worked for me.

HTH.