[CentOS] CentOS5U2 waiting too long when ssh login to other linux servers

Les Mikesell lesmikesell at gmail.com
Tue Mar 31 13:36:37 UTC 2009


Ryan J M wrote:
> The waiting time is about 50s on my CentOS box now. "yum remove
> openssh* "and "yum  install openssh*" can't make it right. "mv
> ~/.ssh{,.bak}" not works either.
> Here comes my tcpdump log, I am not an expert on SSH, Can anyone here
> get me out of this?
> 

The answering sshd will do a reverse DNS lookup on the connecting IP 
address.  That's about the right time to wait for timeouts from 2 DNS 
servers if they don't respond.

-- 
   Les Mikesell
    lesmikesell at gmail.com



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