Monitor Authenticating proxy

the Curl command should look something like:

curl www.microsoft.com --http1.1 --proxy-ntlm --proxy-user : --proxy http://: -v > .\out.txt

You could use proxy-basic instead of proxy-ntlm depending on auth cversions available

I also created an AD user to authenticate as, which had no permissions on the network except for access to the internet via the proxy, with no password expiry.