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Cygwin unable to resolve hostnames


I'm not sure when this started, but recently Cygwin has been unable to
resolve (certain) hostnames.

Example:
 wget github.com
--2015-07-22 15:17:04--  http://github.com/
Resolving github.com (github.com)... failed: Non-recoverable failure
in name resolution.
wget: unable to resolve host address âgithub.comâ

happens for SSH as well (I'm aware I probably can't ssh to github.com,
but it doesn't fail there, it fails during name resolution)
 ssh github.com
ssh: Could not resolve hostname github.com: Non-recoverable failure in
name resolution

however, I can get to github.com in the browser sitting next to the
cygwin window just fine.
ping (from windows, but inside cygwin) also works...
ping github.com

Pinging github.com [192.30.252.129] with 32 bytes of data:
Reply from 192.30.252.129: bytes=32 time=43ms TTL=128

Interestingly enough, google.com DOES resolve correctly.
wget google.com
--2015-07-22 15:23:27--  http://google.com/
Resolving google.com (google.com)... 74.125.224.110, 74.125.224.99,
74.125.224.103, ...
Connecting to google.com (google.com)|74.125.224.110|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://www.google.com/ [following]
...........

No hostname other than google.com that I've tried resolves at all
unless it is defined in my Windows hosts file.

I've searched google, the mailing lists, and the faq in vain.

Any ideas?

Thanks!

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