@dan thanks for the screenshot, It's a new addition, never used to be there. I've made a recommendation to the team that work with the modem vendor.
its not new - i would have added those exceptions a few years ago atleast when i switched from mediaportal to plex.
i can see it in the manual for a 7390 which is older again than the model im using
you do need to enable the "advanced view" global setting in the fritzbox webui however