The envirenment is Actually multiple schools with different laptop models all having the issue with windows 8.1 only, I have my own laptop tested on Cisco and HP shows timeout on clearpass, while in Aruba it works but it actualy take long time to get authenticated.
The Auth ACL allowing full access to clearpass which is the OCSP, no firewall on the WLC nor HP controller nor on the client machine all disabled.
The post mentioned on microsoft website is acutally mine :) and this is what is confusing me, it works with Aruba so how come the bug is not showing with Aruba Wireless ?!
Thanks for the help and your replies, i want to understand this to at least convense the customer that it is a windows bug since it works fine with Aruba :(