I had the same problem. We were working fine when using vWLC on VMWare 4.1 Upgraded VMWare to 5.5 and problems started. Cisco tech had us build a new WLC running 7.4.110. Same problem. Solution was to change APs to Flexconnect and have them send auth requests directly to Cisco ACS. Environment: Windows XP and 7 computers using Peap 802.1x to authenticate via virtual Cisco ACS connected to Windows AD Server. We are NOT using EAP-TLS - no cert.
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