My PC is windows 10, my site is https and my phpVMS is 5.5.2 and I can connect my kACARS free 1.0.1.1 just fine and it works with FS9, FSX, P3D, X-Plane 11, X-Plane 12 and FS2020 with no issues, but this user has windows 11. I have no experience with Win11, so I thought it might be a compatibility issue with win 11.
I will forward your post to this user.