I sometimes get this error message: sshd[543767]: WARNING: DNS lookup failed for " 171.31.1.21" Why is this error message?
For what sshd needs DNS? If the DNS is unavailable I can't log into my computer. How can I resolve this problem, so I can still login if the DNS is not available?
IIRC sshd does a reverse dns lookup to see if that matches the hostname / ip-address combo. Try setting UseDNS to No in sshd_config and/or start sshd with the -u0 option.
regards,
Derkjan
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