If your 2N device is not connected anymore to CyberGate, please check if your 2N device is running version 2.49.0.75.4
Please upgrade to version 2.49.0.75.5 to resolve the issue.
Fixed issue in 2.49.0.75.5:
Fixed a critical issue with DNS which caused the device to, e.g., become unable to re-register to a SIP server after its IP address changes. This also solved other DNS-related issues.