Only certain players can connect

[IshKaigen]

For some reason certain players can not connect to my server or even see it, they are putting the correct port and IP (including my actual IP and domain IP) but they never work or connect, yet some of my players can see the server and connect just fine. I even tested with one of the players unable to connect to the Bedrock server and had them connect to my Java server and it worked just fine without issue, any idea why it's seemingly blocking connection? I tried port forwarding different ports to no avail. Also as a sidenote, when i check if the port is open on sites like canyouseeme.org, it shows as closed for my Bedrock server but open for the Java server. I have no idea why, i've done everything correctly and have port forwarded dozens of times for the past 8 years now.

Edit: My windows firewall is off, it's not that.

[nobu-sh]

I had this issue once with another bedrock server tool, I never found out why it wasn't working though, I just ended up reinstalling windows, and it fixed.
へ‿(ツ)‿ㄏ

One thing I can say for sure is if you are using Windows 10 Home edition that could be the issue, back when I had it all I had was problems with hosting servers etc, but the minute I upgraded to 10 pro I have yet to have an issue

[Weissnix4711]

Also as a sidenote, when i check if the port is open on sites like canyouseeme.org, it shows as closed for my Bedrock server but open for the Java server.

This is expected. MC Bedrock uses UDP. Port checker tools often do not play too well with UDP applications.

Sounds like a firewall issue. (Note: This all depends on your specific router.) Check your port forwarding settings. Make source IP range is set to any, if you have that option. Only redirect whichever specific port(s) you want. For protocol select UDP. You can also select TCP/UDP, but it's unnecessary.

As @NobUwU mentioned, it may also be an issue with Windows. Idk, I've long given up on Windows lol.

Do the players who cannot connect get any specific error? Or just unable to connect to world? Get them to try reinstalling their game, or using a different device (but from the same network).