VMware View Implementation - Need Help Troubleshooting

Anything upstream of APM blocking port 4172 UDP? That port is required for PCOIP proxy to work. Also double-check that you have entered the right external IP address in the relevant iApp section - if the Virtual IP address on the APM is not public, you must enter the NATed version of it in the proper section of the iApp - those two are the most likely culprits based on your initial description.