I recently had a issue with conecting Cat4500-E switches with SupIV to CAM. I have recieved error message "unable to control x.x.x.x".
Whole problem was switch OID not in the database of CAM.
For those experiencing the same problem go to on the CAM:
Device Management > Clean Access > Updates > Update
CHECK "all" options and RUN UPDATE!
You need internet conectivity for sure.
Hope this helps the others.