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Old 09-22-2004, 12:38 PM   #1
twantrd
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Registered: Nov 2002
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Slow authentication


Hi,

I have installed RHAS 3.0 on 4 machines and when I ssh into them and log in (supplying my username and password), it takes a long time (a good 5 seconds) before I am able to see the prompt. This happens on all 4 machines I have built. Has anyone noticed this too? Is there something I can do to eliminate this long latency? Thanks!

-twantrd
 
Old 09-22-2004, 12:59 PM   #2
win32sux
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i think you either need to make sure that the dns servers the boxes with the ssh daemons are using are fine, or use this line in the /etc/ssh/sshd_config file of the servers:

Code:
UseDNS no
 
Old 09-22-2004, 06:20 PM   #3
twantrd
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Thanks! That worked. However, why would DNS have an affect on login authentication? That makes me perplexed. Can you explain? Thanks!

-twantrd
 
Old 09-23-2004, 12:21 AM   #4
chort
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Because UseDNS causes sshd to attempt a reverse DNS lookup of every IP that initiats a connection. You didn't have PTR entries for the IPs you were connecting with. The delay was caused by the DNS lookup being performed and timing out.

Last edited by chort; 09-23-2004 at 12:23 AM.
 
Old 09-23-2004, 02:29 AM   #5
twantrd
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Ahhhhh! Thank you very much!

-twantrd
 
  


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