Recently we have seen issues with VMware Vcenter and Host Update not working as expected. Error like the one below may be displayed when attempting to update hosts:

Cannot download VIB: ''. This might be because of network issues or the specified VIB does NOT exist or does NOT have a proper 'read' privilege set. Please make sure the specified VIB exists and is accessible from vCenter Server.

VMware have recently changed their update processes to require the download URLs for Vcenter and Host updates to be changed to include a unique download token.

This token can be generated by accessing the Broadcom Support portal. You will need product administrator role to be able to generate the token.

Once generated it can be applied to various VMware products using the knowledge article below:

VCF authenticated downloads configuration update instructions - https://knowledge.broadcom.com/external/article/390098