KB1788: Credentials Test or Job Fails when attempt to use VIX
www.veeam.com › kb1788Jul 08, 2013 · Veeam Backup & Replication uses the VIX API as a network-less connection method to perform Guest Processing when a VM cannot be contacted directly via RPC. Due to the way VIX operates, it is blocked by Windows User Account Controls. Also, because VIX relies on VMware Tools, if VMware Tools is out of date, issues may occur.
Troubleshooting Guest Processing "Test Now ... - Veeam Software
www.veeam.com › kb3225Jul 23, 2020 · In VMware environments, Veeam Backup & Replication can use two methods to connect to a guest: RPC or VIX. If RPC is testing successfully, it is generally acceptable for the VIX test to fail as it will not likely be used. However, if it is desired to have VIX succeed, please see the relevant section at the bottom of the solutions section.