Got this issue trying to register/enter the license key in the R1Soft Backup Manager Web interface?
java.net.UnknownHostException: <SERVER_NAME>: <SERVER_NAME>
Not unique in ID space [Page dCJQ_]: activationWindow
This mean the server host name do not match the IP address you specified in your license pool at the R1Soft Customer Portal.
Create or set the A record properly on your DNS, wait for propagation and try to license again.