Chrome Version       : 60.0.3112.78 (Official Build) (32-bit) 
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari:
    Firefox:
         IE:

What steps will reproduce the problem?
(1) Set AuthServerWhitelist variable (or trusted site on windows)
(2) Run chrome with --headless flag
(3) Navigate to a url that requires windows authentication

What is the expected result?
Receive authorised response

What happens instead?
Receive unauthorised response

Please provide any additional information below. Attach a screenshot if
possible.
This works without the --headless flag, as soon as I add in --headless the auth no longer works