I am facing a problem after upgrading ACS 3.3 to 4.2 for windows. all my VPN clients are terminating on a VPN 3015 box & they are authenticating by AD through ACS.
client----->VPN Appliance------>ACS 4.2 windows-------->AD
When I test authentication from the vpn box itself its working fine but when a client tries to authenticate it fails. Can anybody have any idea about this.