This issue is resolved in :
vCenter Server 6.7 Update 2, available at
VMware Downloads.
vCenter Server 6.5 Update 3, available at
VMware Downloads.
Workaround:
To workaround this issue, manually re-establish the trust relationship between vCenter Server and the Key Management Server(s). For more information see
VMware Docs.
- Log in to the vSphere Web Client, and select a vCenter Server system.
- Click Configure and select Key Management Servers.
- Select the KMS instance with which you want to establish a trusted connection.
- Click Establish trust with KMS.
- Select the option appropriate for your server and complete the steps.