This user OS null issue was last seen on one of the old release for CAM for which later Cisco issued a fix in a new release. Please check the version of CAM and CAS and Agent you are running and make sure you are upto date. Also double check that pat...
Cisco promised a new release/patch to support Windows Vista by the end of March. We are waiting for the same as more and more people are now bringing Vista machines online.
Some program on your computer is messing up with Clean Access Installation. One big cluprit is presense of Spyware on your machines. I would try uninstalling Clean Access, then running Lavasoft Spyware remover (free) and Spybot search and destroy (fr...
You can create a separate rule with certain version number as a benchmark and rule should be to allow everything higher than that value. Then in the requirement section select this newly created rule along with predefined check for update rule. Also ...