Posted in Server things

Slow Putty? Prevent reverse DNS lookups

Hint from securebadshah on superuser.com here

Probably the reverse DNS resolution (server trying to get client’s name given IP) is taking time. Can you check if /etc/ssh/sshd_config has setting “VerifyReverseMapping yes” ? Set it to “VerifyReverseMapping no” and check if helps.

Edit: It seems VerifyReverseMapping is now deprecated and useDNS is the new configuration in the sshd_config.

Adding a “useDNS no” line to /etc/ssh/sshd_config made my ssh login via Putty happen much faster.

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