by David Perry.
Try the instructions here:
https://docs.moodle.org/28/en/NTLM_authentication#APACHE_Configuration
They didn't quite work for us (as in, Apache doesn't pickup if you're logged in, via the browser, and pass that login detail to moodle) - we're still waiting for some time with IT so they can look at what we might be missing.
I've done the NTLM thing in IIS, 2min job!