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Re: scp warning

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On Fri, 24 Jun 2011 18:07:22 +0000 (UTC)
Bob Tennent <BobT@cs.queensu.ca> wrote:

> scp has taken to producing messages of the form
> 
>   Address ...  maps to ..., but this does not map back to the address - 
>   POSSIBLE BREAK-IN ATTEMPT!
> 
> How can I suppress such messages?

By fixing the DNS. 

Basically if you log in from 1.2.3.4, ssh does a reverse DNS lookup to find
the PTR record (ie, the domain name) associated to that address, and then
it does another forward lookup of the A address for that name, and check
that it corresponds to the IP address you are logging from (ie, 1.2.3.4 in
this example). If you fix the DNS to have those lookups match, the warning
will go away.

Alternatively, you could set

UseDNS no

in the sshd configuration file.

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scp warning Bob Tennent <BobT@cs.queensu.ca> - 2011-06-24 18:07 +0000
  Re: scp warning pk <pk@pk.invalid> - 2011-06-24 20:19 +0200
    Re: scp warning Bob Tennent <BobT@cs.queensu.ca> - 2011-06-24 19:17 +0000
      Re: scp warning Bob Tennent <BobT@cs.queensu.ca> - 2011-06-24 19:33 +0000

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