Error Could Not Connect to Server

I've been using the Windows to Ipad library reading for quite a while now, and I love it.
A few days ago, I open my app(With my YAC library running on PC) and the connect prompt comes up(which has never happened), and when I either manually use the IP and correct port, or scanning the QR code, I get "Error Could Not Connect to Server"

• I've reset my modem, and Wifi.
• There are no Firewall issues.
• MY Windows 11 and YAC Library are updated.

This has never happened before. There has been no change in my system.
I always praised your software's ease and stability, and want to continue. Please help!

and the connect prompt comes up

What prompt?

This kind of problem comes up regularly and it is always related to the user setup, something has changed in your setup. It can be the permission of the iOS app to access your LAN, it can an update of the router blocking the connection, wrong connection data being used (make sure you are using the actual ip of the device running the server), etc.