Context:

EveryonePrint Mobile Gateway has been installed in order to enable iOS devices using the built-in AirPrint functionality.

Issue: 

When using AirPrint, user selects a printer and press "print"; after an elapsed period, an error message is displayed on the iOS device: "The printer is offline."

This error is the sign that there is a communication error for the print flow between the iOS device and the EveryonePrint gateway on TCP port 7910

Resolution: 

• Check that firewall and routers are not blocking communication on TCP port 7910 between the iOS device and the EveryonePrint gateway.

• Verify that communication from the iOS device to the Mobile Gateway is possible through TCP port 7910:
  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 port is accessible