Originally Posted by
gfunkdave
You only need to do this if your router doesn't work with uPNP - else, Plex configures the port by itself. The vast majority of consumer routers support uPNP.
UPnP is extremely dangerous. Regardless, a port still needs to be forwarded, whether it's done automatically or manually, which is what my response was pointing out.
I would highly recommend disabling UPnP on all routers. It's incredibly susceptible to RATs and allows devices to reconfigure the router without any user interaction.
Recommendation #2 would be to use something besides the default port. I can see on my firewall logs that internet peeps are always probing the default ports of common services (SSH, FTP, Telnet, IMAP, HTTP, etc.). Plex probably hasn't risen to that level of notoriety yet, but it could in the future.
https://community.rapid7.com/docs/DOC-2150