Is anybody else seeing Windows 10 prepending "host/" to eduroam usernames
in EAP/TLS auth?

We've had trouble getting our Windows 10 machines authenticating onto our
eduroam SSID using EAP/TLS. We seem to have two outcomes, neither of which
work:
1) if we create a "Manual Profile" then no authentication traffic ever hits
the RADIUS server.
2) if we do NOT create a manual profile then an authentication request does
hit the RADIUS server, but with "host/" prepended to the hostname. Our
RADIUS server rejects the authentication with "host/" prepended; I imagine
a roaming user would have often have the same issue.

I have a theory: The eduroam auth requires a "realm" to be appended to the
username so eduroam service-providers and federated RADIUS servers know to
proxy a roaming RADIUS auth to the correct server. In our case, we append "@
ucar.edu" to the username. Maybe that "@ucar.edu"  is provoking Windows10
to prepend the "host/" prefix.  Authentication to our internal SSID without
the "@ucar.edu" is working normally.

Any clues?

I think we can build a workaround to rewrite the username on the RADIUS
server, but that won't help our roaming eduroam EAP/TLS users if other
eduroam service-providers are having the same issue.

Scot Colburn
Network Engineer NCAR/UCAR/NETS/FRGP

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