We have a Forefront TMG proxy at work. When I configure some command line tools with the proxy address, I often include my credentials using
username:password@proxy-address but it never works.
I suspect that this only works for Basic Authentication but the TMG proxy doesn't have this setup, I have seen the headers in the challenge response.
Does TMG support Basic Auth and will it use AD credentials or will it use some kind of internal list of users?