How do I configure an iPad to trust all certificates from my CA?

I have a wireless solution setup that uses PEAP to encrypt the authentication transaction, however all our iPads don't trust any certificates that our RADIUS server uses. I used Apple Configurator to install our CA certificate onto the iPads, however all certificates used in PEAP that are issued by that CA aren't trusted on the iPad and I must instruct it to trust be trusted when authenticating to the network.
I also tried using a wildcard certificate from GeoTrust, but despite the certificate being from a trusted CA all users are prompted to trust the certificate. I double checked and according to apple here: List of available trusted root certificates in iOS 8 - Apple Support , GeoTrust's CA is trusted by the iPad and yet certificates issued by the CA aren't trusted when using PEAP.
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Craig BeckCommented:
It can be done...

Have a look at the long post from 'wifigood' here...

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byt3Author Commented:
I found that when setting up a profile that you have to explicitly trust the CA cert for the Wifi SSID. Doing that works and therefore trusts all certs for any RADIUS servers issue by that CA, so long as the device is connecting using the SSID in the wifi profile.

I still don't understand why the wildcard certificate isn't just trusted without using profiles since GeoTrust's CA should already be in the iPads trusted CA list according to apple support.
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