Web Filter APM

Our goal is to monitor a site we have filtered..

We want to try to access a particular web site that we filtered in our Web Gateway. (This is our backwards way of saying that a 'access denied' is a good thing.

Is there a way to use APM to make sure that this particular site is really filtered..

 

I have been using.. the HTTP monitor, with a External Node (I added a web site that is filtered and one that is not)

regardless of how i use the Proxy setting (using the gateway or not) all the servers come back on the test as found... no access denied.