Resolve "KeyPage not available" Error on Universal Transaction Gateway

What is causing this Error?

In the UTG Stand Alone application, an error stating “KeyPage not available…” appears during the initial phase when the Ingenico goes through the boot-up sequence and isn’t able to proceed further.

How do I resolve this Error?

First, try opening Stand Alone again as an Administrator.

• Right-click on Stand Alone and select Run as administrator.
  
  

This could also occur as a result of an incorrect TuneUp application configuration. To resolve this:

1. Open the UTG TuneUp application.
2. Navigate to the Express tab.
3. From there, set the Port ($ for hex) option to 26880.
   

If the above doesn't work, these are other possible solutions to this error: 

• Add the Universal Transaction Gateway (UTG) or UTG Stub to the Windows Firewall
• Shift4 IP Addresses, Ports, and DNS Names
• Internal:
  Verify Universal Transaction Gateway Connection to the Shift4 Data Center When Not Able to Process Transactions