VMware Cloud Director connection to vCenter fails with HTTP 503 error

Products

• VMware Cloud Director

Issue/Introduction

• vCenter Server is showing as disconnected in the VMware Cloud Director (VCD) Provider UI (Resources > Infrastructure Resources > vCenter Server Instances).
• The following error is observed in /opt/vmware/vcloud-director/logs/vcloud-container-debug.log:

     <YYYY-MM-DD> <HH:MM:SS> | DEBUG    | pc-activity-pool-#######  | CJob                           | updateFailedJob(com.vmware.ssdc.util.LMException) with locale=null | activity=(com.vmware.vcloud.vimproxy.internal.impl.PropertyCollectorReader,urn:uuid:########-####-####-####-############)
com.vmware.ssdc.util.LMException: Error caused vCenter Server disconnect
        at com.vmware.ssdc.backend.vimeventlistener.VirtualCenterListener.onVirtualCenterConnectionStateChanged(VirtualCenterListener.java:108)
     ......
        at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.vmware.vim.vmomi.client.common.UnexpectedStatusCodeException: Unexpected status code: 503

Environment

VMware Cloud Director 10.6.x

Cause

The vCenter services are unavailable, as indicated by a 503 status code. This can be caused by an unexpected vCenter reboot, a VCHA(vCenter High Availability) failover, or other service interruptions.

Resolution

Verify that the vCenter Server services are running and accessible.

Additional Information

vCenterへのVMware Cloud Director 接続が HTTP 503 エラーで失敗する