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The ACM CA cert file can be downloaded
Unzip the the file for use.
For wireless security in network manager
-Select “ACM” from the networks list -Enter your ACM username -Enter your ACM password
It should then connect, although the first time may be slow to authenticate.
Much of the process is similar to the one described here. So you can use it as a visual reference.
Windows 8/8.1 should be about the same procedure with a different interface to get to the initial dialogs
Connect to the wireless network and enter your ACM username and password when prompted