I am running Plex from my Synology NAS. My ISO used to be Sky when I provided remote access to my Plex server to a friend. I have moved home and changed ISP to Virgin and now that user cannot access my Plex server. I have added another friend since moving and they can access my Plex fine.
Despite this pointing away from my router I have added port forwarding from my internal port 32400 to my external port 17335. I have confirmed the NAS has a static IP assigned
My Plex server is showing no restrictions on the users access via Manage Library Access.
I am wondering does the public IP change when you change ISP? I would think not because it should be a separate setting