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From: "Derkjan de Haan" <derkjan@haanjdj.demon.nl>
To: =?ISO-8859-2?Q?Kov=E1cs_P=E9ter?= <kovacspeter2@freemail.hu>
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Date: Sun, 19 Dec 2004 19:20:29 +0100
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cc: freebsd-stable@freebsd.org
Subject: Re: sshd DNS
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>
> 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