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There was a similar bug reported (and already closed) upstream about --proxy-anyauth not working as expected when multiple authentication methods are offered by a proxy:
https://github.com/curl/curl/issues/876
While the logic behind --proxy-anyauth could be improved to cover more scenarios, the most reliable solution is to ask (lib)curl explicitly to authenticate via NTLM when NTLM is needed to connect through a proxy.
Customer from attached case confirmed that this modification helped him to bypass error 407 when connecting to cdn over proxy which supports Basic and NTLM authorization. It forces Basic authorization.
Will create KCS as well.
/usr/lib/python2.7/site-packages/urlgrabber/grabber.py
~~~
1481 # All but Kerberos. BZ 769254
1482 #pycurl.HTTPAUTH_ANY - pycurl.HTTPAUTH_GSSNEGOTIATE)-----> commenting this line
1483 pycurl.HTTPAUTH_BASIC) ------------> adding this line
1484
1485 if opts.username and opts.password:
1486 if self.scheme in ('http', 'https'):
~~~