Have now tested problem on a second computer in my possession [windows 11 with the same router and a secondary router] and helped to attempt to connect two computers that where external to my internet connection with the same time out issue, all computers running 1.19 and 1 being a apple laptop vs a windows machine.
Created a new port foreword on my router and created an exception to every java system file in windows firewall on windows 11 and was not able to use IP:PortNumber to open a LAN server to both local computers and external computers and am unable to connect local or external via IP:Port to other computers, tested with both modded and non modded 1.19 with the same results, no related issues with other versions installed
Confirmed with user: LAN also not working on a fully updated Mac book 2022 Pro MacOS 12 Monterey