In some scenarios, when you enable the remote support tunnel, it’ll tell you that it has been temporarily enabled but the status will show “disabled”.
To troubleshoot, you can start by checking Basic IP connectivity to nsc01.nutanix.net or nsc02.nutanix.net. If that times out, then it is either a DNS resolution problem or a firewall issue.
Check the firewall rules of your system to allow outbound connections to nsc.nutanix.com on port 80 or 8443.
For more details on troubleshooting, check KB-1044