How to Disable on Iphone and MAC OSX Clients use of Certificates

[Nedi]

Hi,
I use on Bufallo Router the Freeradius Server future and all works well  with Certificates, but sometimes after router reboot  some  clients can’t login in the Network if Certificate used.
If I disable the certificate check on windows I can login without Certificate  but on new Macbook and Iphone  I can’t disable  Certificate check.

Has anyone idea what I can do? and is this dangerous to communicate in Wlan without Certificate check activated?

Can the Wlan without use of Certificate easy be hacked?

Best Regards 
Nedi

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