When configuring native AirPrint or App printing from Apple iOS devices, it can sometimes be a little hard to determine the source of a timeout or "The printer is offline" error or similar.

Most of the time when AirPrint or App printing doesn't work, it's a network port not being open in firewalls between the mobile device on the WiFi network and the EveryonePrint servers with mobile gateways.

Use the following simple method to verify if a port is open and accessible from the Apple iOS device:

1. From the Apple App Store install the "iNetTools Free" app
2. Choose Port Scan in the App
3. Enter the destination DNS/hostname/IP address of the server hosting the EveryonePrint Mobile Gateway and the port to test, ie port 7910 for native AirPrint
   
4. Choose Start to start the port scan
5. The result will appear and if it says "Open" the ports are accessible