If I change the mpd configuration to use PAP instead of CHAP, I get authentication success, but then there's some weirdness going on on the mpd side of things that I'm also trying to figure out.
Even though rlm_chap complains about not being able to find a proper Chap-Password attribute, I can see the MS-CHAP-Challenge and -Response right in the packet debug.
as I was told recently, you can't get there from here.
There is currently no way to authenticate via CHAP against a Windows domain from Linux. Alan explains this in the thread I started last week.
The best possibility I have found is using a radius relay and a Windows based radius server like Internet Authentication Service which comes with win2k server. Haven't tried to get it to work yet, but it is the most likely way to get it working.
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