When running a bulletin scan on virtual inventory with Protect, the hypervisors (ESXi hosts) must allow http traffic over ports 80/443. You can verify and enable this using the vSphere client with the below steps:
1. Select the hypervisor in the inventory.
2. Click on the Configuration tab.
3. Select ‘Security Profile’ in the Software grouping.
4. Click ‘Properties…’ at the top of the Firewall settings.
5. Verify or enable ‘httpClient’ in the list of firewall settings.