If you manage a vSphere environment, you've likely encountered certificate-related issues—whether it's a warning when connecting to the vSphere Client or a failure during service startup. One VMware Knowledge Base article that comes up often in troubleshooting these scenarios is .

Resolving SSL Certificate Errors in vCenter Server: A Look at VMware KB 55798

While the article itself addresses a specific error related to STS (Security Token Service) certificate validation, its underlying principles apply to many certificate rotation or mismatch problems in vCenter Server 6.x and 7.x. Let's break down what KB 55798 covers and why it matters.

VMware KB 55798 – STS certificate untrusted or expired (requires VMware account login)