KS
When the STS certificate expires, logging in to vCenter Server will fail with:
HTTP Status 400 – Bad Request Message BadRequest, Signing certificate is not valid
As the STS certificate will expire silently (no alarm is raised in vCenter), we want to help ensure that you avoid this situation.
The below Knowledge Base articles provide steps to check the expiry date of the certificate along with the steps to renew the certificate if it is due for expiry soon:
• KB 79248: Simple ways to check the STS certificate expiration date
• KB 76719: Scripted/automated method to replace STS certificate


