Re: trouble shooting slow ssh logins

[aurfalien@xxxxxxxxx]

> ----- Original Message ----
>> From: "aurfalien@xxxxxxxxx" <aurfalien@xxxxxxxxx>
>> To: CentOS mailing list <centos@xxxxxxxxxx>
>> Sent: Thu, 21 January, 2010 20:07:27
>> Subject: Re:  trouble shooting slow ssh logins
>>
>>> aurfalien@xxxxxxxxx wrote:
>>>> 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.


The DNS server also behaved regarding name/ip addy lookups.

This server is a Zimbra mail server which during install, checks for  
proper DNS configs.  I usually check proper functioning DNS by hand  
anyways.

The ipv6 line was strange but I read a while back, some tech note  
about ensuring that is your last line in hosts.

- aurf
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