DR-Series | FEN Error " Device Name check failed!

Environment:

• FEN setup

Procedure:

1. Getting a " Device Name check failed!" When checking the name.
   
2. Go to Network>WAN and enter a valid "DNS" address.
   
3. Click on the "Test" to confirm the DNS address is valid 
   

4. Go to Network>FEN, enable "Use FEN", and click on the "Check" button