Question regarding LEAP vs PEAP authentication

I work as a PC support tech for a fairly large company and have a question that no one here can seem to answer.

Or wireless setup uses WPA 2 enterprise and generally uses PEAP with MS-CHAPv2 authentication. However recently I had a laptop what would not authenticate properly, and just for the heck of it I switched it to LEAP authentication which surly enough worked. After asking one of the network team about it he informed me that yes although we generally use PEAP, LEAP will also work and that's actually what he prefers because it's more "reliable". At first I just said alright that's fine it works, but I later noticed that the system date was off on the machine. After changing the system date the laptop connected through the proper PEAP authentication.

The question I haven't been able to answer yet is why is system time so critical with PEAP but not LEAP. I have have a basic understanding of the PEAP two phase authentication vs LEAP, but still don't under stand the importance of the system time to PEAP. I know radius is very picky when it comes to system times, but both LEAP and PEAP authenticate with RADIUS so it seems to me neither should work?

I wish i could help you answer that

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