If you have problems connecting to your WePrint server, here are some options try.
Try rebooting your network router

Make sure WePrint is installed on your Mac or PC to share files with your iPad/iPhone.
Install WePrint on your Mac or PC from here: https://esz.nz/wp

Make sure WePrint on your Mac/PC and also the iPhone/iPad are in the same network

On rare occasions connection problems occur and are usually caused by your Firewall. Check the Windows help page to make sure your
firewall isn't blocking connections. Try turning off your firewall temporarily to test it.

Try also changing the WePrint port number in the WePrint Settings - Advanced tab. Set the custom port number to 8081 or 8082 etc. Make sure you change the port on your device too if you do this.

Check that your device is connected to your Wi-Fi router with a password if it needs one. Some routers allow guest access with no password, but that blocks access between devices in the same network.
If your router has password access, enter it in your iPhone/iPad settings.
Some routers have a feature in the router Admin screens called "AP Isolation". This will block access between devices. Check that "AP Isolation"/"Wireless Client Isolation" is off.