The Support Tunnel option is available in the Overview section on the Install and Support page.
The support tunnel allows the vRealize Network Insight engineering team to remotely connect to customer's platform and collector VMs on the SSL secured connection. You have to request the access to support tunnel when the vRNI engineering team needs to access the setup for advanced troubleshooting or debugging.
Ensure that the traffic to
support2.ni.vmware.com on port
443 is allowed.