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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Subject:	Re: Cygwin unable to resolve hostnames
Date:	Tue, 16 Feb 2016 09:30:58 +0000 (UTC)
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Carl-Erik Kopseng <carlerik <at> gmail.com> writes:
>>> ssh: Could not resolve hostname timbuktu.kopseng.no: Non-recoverable
>>> failure in name resolution

>> I don't think this is a generic Cygwin problem.  I can resolve the
>> hostname just fine:
>>   $ uname -svr
>>   CYGWIN_NT-10.0 2.4.1(0.293/5/3) 2016-01-24 11:26
>>   $ ssh timbuktu.kopseng.no
>>   The authenticity of host 'timbuktu.kopseng.no (51.175.197.68)' can't be
established.
>>   RSA key fingerprint is SHA256:ddcghrb6BI6+TVDKDE3Yf+U43v9EL6u7HsNw7Hec+y8.
>>   Are you sure you want to continue connecting (yes/no)? no
>>   Host key verification failed.

> I think it has to do with how Cygwin interfaces with VMs. Perhaps it
> has something to do with network tunnelling or something related to
> how ip and DNS works when being NAT'ed through VMWare Fusion.
> 
> I am running the Windows 8 VM on VMWare Fusion on OS X 10.11.3

Could it be lack of support for DNSSEC as your domain shows:

  $ whois kopseng.no
  % Kopibeskyttet, se http://www.norid.no/domenenavnbaser/whois/kopirett.html
  % Rights restricted by copyright. See
http://www.norid.no/domenenavnbaser/whois/kopirett.en.html

  Domain Information

  NORID Handle...............: KOP444D-NORID
  Domain Name................: kopseng.no
  Domain Holder Handle.......: CK1990P-NORID
  Registrar Handle...........: REG42-NORID
  Tech-c Handle..............: DH38R-NORID
  Name Server Handle.........: NSHY11H-NORID
  Name Server Handle.........: NSHY46H-NORID
  Name Server Handle.........: NSHY81H-NORID
  DNSSEC.....................: Signed
  DS Key Tag     1...........: 42355
  Algorithm      1...........: 8
  Digest Type    1...........: 2
  Digest         1...........:
8065b555e0009918e7aba49191e6409481afc702f028c0ff20f1bf27e847e21b

http://dnssec-debugger.verisignlabs.com/timbuktu.kopseng.no shows no issues
with setup. 

VMware KB search shows no DNSSEC hits on Fusion, bunch on ESX. 
Might want to start with
https://communities.vmware.com/message/1454999#1454999 and the rest of that
thread. 
You can browse from there to more generic natd, dhcpd, and net config and
diag info or RTFM. 



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