Error: "Could not connect to one or more vCenter Server Systems"

Products

• VMware vCenter Server
• VMware vSphere ESXi
• VMware Cloud Foundation

Issue/Introduction

• Unable to see objects in vCenter when using [email protected]

• UI access degregades leading to UI timeout

• Browser developer tools display a 404 error related to websso.js

• "Virtual Machine CPU usage" alert may be generated for vCenter VM

• vCenter snapshot exists and are older than 72 hours 

• vCenter not in Extended Link mode

 

Environment

• vCenter: 7.x, 8.x, 9.x

• ESXi: 7.x, 8.x, 9.x

• VCF: 5.x, 9.x

Cause

The snapshot file will continue to grow in size when it is retained for a longer period and will impact system performance the older/larger the snapshot gets.

 

Resolution

1. Delete or consolidate all snapshots older than 72 hours. 

2. Adhere to best practices for using VMware snapshots in the vSphere environment.