yaleman.org » openssh http://www.yaleman.org a blog by James Hodgkinson Thu, 19 Jan 2012 11:10:42 +0000 en hourly 1 http://wordpress.org/?v=3.3 SSH Reverse DNS Lookup Disable http://www.yaleman.org/2007/12/09/ssh-reverse-dns-lookup-disable/ http://www.yaleman.org/2007/12/09/ssh-reverse-dns-lookup-disable/#comments Sun, 09 Dec 2007 02:42:22 +0000 James http://www.ricetek.net/2007/12/09/ssh-reverse-dns-lookup-disable/ This isn’t the most interesting of posts, but a good “note to self” for future reference. If not disabled, SSHD will try to do a slow reverse lookup of the IP address of the client causing for an unnecessary delay during authentication. I often run into trouble with this when creating a new install of Linux or FreeBSD. Do the following to disable it:

In file /etc/ssh/sshd_config:

UseDNS no

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