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vCenter Server Internal Certificate Expiration – If your vCenter server (Appliance or Windows) was deployed as 6.5 Update 2 or later, the Security Token Service (STS) signing certificate may have a 2-year validity period. Depending on when your vCenter was deployed, this may be approaching that expiration date. There is no vCenter Alarm for this condition. I highly recommend you take a few minutes and check your environment and proactively replace the certificate if needed.
- KB 79248: Simple ways to check the STS certificate expiration date
- KB 76719: Scripted/automated method to replace STS certificate