Disabling SSH reverse DNS lookup

Posted by Herman on 31 August, 2009 Leave a comment (3) Go to comments

When reverse DNS is not available, the sshd reverse lookup is an annoyance. It can be disable it in /etc/ssh/sshd_config with the following option:

UseDNS no

yay.

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Orbit Ubuntu, Tech
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3 Comments.

  1. Jacob Peddicord 31 August, 2009 at 19:13

    A few years ago I was having a problem where my ssh connection would stall on connect for up to a minute. Figured out it was this, but instead of setting the UseDNS flag (didn’t have full server access) I just called my ISP and they added a reverse DNS entry for me. Yay!

  2. Markus 1 September, 2009 at 6:53

    Also setting name server to 127.0.0.1 is about the same thing, it helps also for other applications that like to do reverse lookups and hang for timeout.

  3. Herman 2 September, 2009 at 20:40

    we are our own isp. but sometimes in a private range we dont’ bother to add a reverse dns for everything,.. apparantly.

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