Cygwin certificate is not trusted? Unknown issuer?

[Kenneth Wolcott]

wget fails

 https://cygwin.com/setup-x86_64.exe
Resolving cygwin.com (cygwin.com)... 209.132.180.131
Connecting to cygwin.com (cygwin.com)|209.132.180.131|:443... connected.
ERROR: The certificate of ‘cygwin.com’ is not trusted.
ERROR: The certificate of ‘cygwin.com’ hasn't got a known issuer.

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