A general system error occurred: Cannot download VIB 'https://hostupdate.vmware.com/software/VUM/PRODUCTION/main/esx/vmw/vib20/esxio-update/VMware_bootbank_esxio-update_8.0.3-0.70.24674464.vib'. This might be because of network issues or the specified VIB does NOT exist or does NOT have a proper 'read' privilege set. Make sure the specified VIB exists and is accessible from vCenter Server.This issue occurs when the hostupdate.vmware.com URLs were enabled at the time the Update Manager service starts. The Update Manager service continues to reference these URLs.
service-control --restart vmware-updatemgr