KB3225: Troubleshooting Guest Processing "Test Now" issues
https://www.veeam.com/kb322523.07.2020 · Regarding Warning in VMware Environments. 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 …
KB1174: RPC function call failed. The RPC server is ...
https://www.veeam.com/kb117423.08.2011 · Veeam Backup & Replication however is not able to add firewall exclusions to hardware or third-party software firewalls. The most common ports that cause this issue when using Application-Aware Image Processing are the Dynamic RPC ports that the temporary guest agents are assigned. These ports are: 1025 to 5000 (for Microsoft Windows 2003)