sshd DNS

[Kovács Péter]

Hello,


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?


Thanks,
 Peter