The error show that web client encounter a connection issue when query the information from the VM. Can you verify that whether you will get the same error when view the VM detail information in web client?
Could you provide the vSphere web client log so that we can trace the root cause of this issue? If you use the VCVA, the log location is /usr/lib/vmware-vsphere-client/server/serviceability/logs/vsphere_client_virgo.log