This is a known issue affecting vCenter Server 4.0.x, 4.1.x, 5.0, and 5.1.
This issue is resolved in vCenter Server 5.5. You can download the latest vCenter Server release from the
VMware Download Center.
To work around this issue when you do not want to upgrade, disconnect and then reconnect the ESXi/ESX host in the current vCenter Server inventory:
- Log in to vCenter Server with the vSphere Client.
- Click Home > Hosts and Clusters.
- Right-click the ESXi/ESX host, then click Disconnect. Wait for the task to complete.
- Right-click the ESXi/ESX host, then click Reconnect.
Note: You may be prompted to provide a username and password to reconnect the host.