bump.
i just upgraded the server to 6.5.5.78974 but still same error occurs.
i already set the server trust to manual and input both clearpass and CA server there to be trusted (my cppm server is an intermediate CA server).
this issue only appears on iOS9 either on iPhone5 or iPhone6, iPhone4/5 running iOS8 or lower works well.
anyone got any clue how to fix this?
Ricky