OK, I am at a complete dead end. I have read virtually all the support posts on solving the issue of "Looking for Servers..." after a new install on a Synology 716+II NAS drive. I tried installing Plex from the Package center, installing from a Plex.tv download and regardless of how I install the package and run the service I keep getting the same results: after logging into my PlexTV account following the launch of the Plex App from the Synology the browser just sits on "Looking for Servers..." endlessly and from the PlexTV App on my phone it shows "Diskstation" (my Synology NAS name), which is listed as a gray bar with the word "unauthorized" under it.
This is all on my local network. I've opened the router TCP port 32400 and attempted to connect using my externally available URL (using DynDNS) and my local IP address for the Synology. Results are always the same as described above. I "temporarily" subscribed to PlexCloud and that worked from my browser, Tivo Romio and Phone. The Synology is simply unreachable and that's what I will use or just drop the PlexTV service altogether. HELP!