Please follow below-mentioned troubleshooting steps to cross check if interface is working correctly :

1. Internet connectivity on machine.

2. Room Type Mapping

eZee Frontdesk Configuration >> Property Setup>>Room Types >>Web Room Type Configuration

Screenshots :

 Rate Type Mapping

Path: eZee Frontdesk Configuration >> Property Setup>>Rate Type>>Options>>Centrix Configuration


4. Integration configuration in eZee FDc

After checking above steps, if all mapping and integration is ok, you can click on Retrieve Web Reservation Button again to check and confirm.