Please pay attention to steps 10 & 11 in the Windows 7 and Windows 10 tutorials.
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Previous Description (2016-02-01 14:30:16):
As part of regularly-scheduled maintenance the wireless authentication server certificate will be updated on February 2, 2016. The renewed certificate will be valid until February 2018.
As a result, some devices will request acceptance of the new certificate before connecting to Queen's wireless networks.
After accepting the new certificate, wireless access will be restored.