setup, not finding server

Hello, i’m trying a first-time setup w/ Window machine and a Synology 1815+.
I have the PMS installed and running according to the Synology Package Center (DSM 5.1).

Whenever I run web.tv or the Plex Media Player, (after logging in) it says “…looking for servers…” forever.

I’ve tried to type into my browser: http://Your-NAS-IP-Address:32400 , but it just times out nothing happens.

Firewall is OFF in Synology (Control Panel -> Security - Firewall -> Enable OFF). Doesn’t seem like my router has any configurable firewall settings…

Any suggestions? What could I be missing/doing wrong?

Thanks in advance.