Unable to connect to vCenter Server via vSphere UI. Get an error message: Unhealthy upstream.
VMware vCenter Server 8.0.x
The VMware-stsd service is not starting.
Results from VDT show that the STS certificate has expired.
Additional causes may include:
Reference KB:
https://knowledge.broadcom.com/external/article/390105/no-healthy-upstream-error-when-attemptin.html