Trying to open port 51820 for my Wireguard docker on 192.168.1.129 and I have exceede all guides on internet. I have 80/433 open, working fine but it was pain as well. Now fighting with the 51820. If you see someting wrong in my setup please let me know..
Online checker for open ports still reports CLOSED with these rules
just created similar rule for PLEX 32400 port and this port is working fine.
is 51820 blocked by OPNsense?
Change the "Filter rule association" to "Pass".
As pmhausen mentioned, change Filter rule association to pass.
Also if you are testing the port with regular online port checker, it might not display port as open (unless filter rule association makes that difference) even when it is.
Most online port checking tools won't be able to check if port is open when using UDP protocol (if interested, read about the difference between UDP and TCP. Shortly, both are same, except TCP is slower, more "trustworthy" and visible, UDP is faster, less stable and invisible)