Wireless connection always says validating identity
From a security standpoint the best option is setup a captive portal.
Students can use their BYOD devices to connect and reach the portal, pass their user authentication credentials to the portal and the portal can then talk to the RADIUS server.
Eduroam is another popular choice for educational organizations.
I know this post is really old, however, this is similar to my issue except that last week, any client could connect to my wireless network and this week they can not. The windows/android/iphone clients were able to connect with 802.1x verifying against a local, Aruba based database of one user name.
Only clients that have not disconnect from the network were still able to access it.
This only happens with the 802.1x ssid (staff) and not with the PSK ssid (for guests).
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You need to distribute your RADIUS server's certificate (if it was self-signed) or the certificate of the Certificate Authority that signed it to your clients.When Windows XP or 7 clients connect they initally fail to connect.