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Group administrators:

Windows Mobile 8 and certificate verification

17 April 2014 at 4:38pm

Announcement regarding Windows Mobile 8 and 802.1X authentication with certificate validation

Best practice is that clients must be configured to trust/verify the CA that signs
the RADIUS server that presents during an 802.1X authentication - a major security
pin for eduroam is this trust/check.

It has been noted that Windows Mobile 8 (WM8) devices would not authenticate the user
if this 'verify' option was chosen.

Research undertaken within GEANT members, the UK 802.1X SIG and verified by eduroam UK
support is that this is due to WM8 requiring an extra attribute in the RADIUS server
cert (note, we have verified that successful authentication can occur if ONLY the
RADIUS server cert has this attribute present). The attribute is the Certificate Revocation
List (CRL) Distribution Point (CDP) e.g.

crlDistributionPoints = URI:

For Windows Mobile 8 to have proper/safe 802.1X authentication your RADIUS servers
will need to have such an attribute present - we are just awaiting feedback/confirmation
as to whether things work if only the CA cert has this attribute (not something
that we can test in the short term)