I've just gone through considerable headache to compile and enable the
cacheproxy plugin sample for WMS 9 on Win2k3 Ent Server (we don't
have the hardware or licensing for win2k8). The cache plugin appears
to be enabled fine and I see the two new cache/proxy publishing points
it created, but when I choose:
server > Properties > cache/proxy plugin > [rightclick cacheproxysample]
...the properties selection is greyed out and inactive.