“No Healthy Upstream” Is Often a Certificate Problem: A vCenter Triage Runbook for KB 316619
You open the vSphere Client and instead of the inventory, you get a blunt message: No Healthy Upstream Sometimes the symptom is more explicit. The login flow may fail with: HTTP Status 400 – Bad Request Signing certificate is not valid Other times the vCenter Server Appliance looks partially alive from the outside, but core […]