We want to implement NAC using IC4000 appliance. Can we use IC4000 to disallow usage of USB storage for Guest User that is connected to a 802.1x enabled port?
Mark, there is no way to disable the use of USB devices via UAC's host check facilty. The only way I know that this can be done is on the SSL VPN platorm in conjunction with SVW (Secure Virtual Workspace).
this is a bit complicated.
look at: http://support.microsoft.com/kb/823732
see if you can prepare a script to automate the process mentioned in this Microsoft's KB link.
if you can prepare a script to perform the operations, use "Session Start/End Scripts" feature of IC/OAC and trigger the script.