Veeam Products are ready for this change and use Packet Integrity DCOM authentication level. However, if the underlying Windows operating systems lack the required security updates, this will result in different authentication levels used for DCOM connections and cause authentication failures. For example, one windows machine may have the hardening changes disabled because it doesn't have the update installed, and the other windows machine has the DCOM hardening enabled because the update is installed.
When these DCOM authentication failures occur, Event# 10036 will appear, showing the following message:
Please raise the activation authentication level at least to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY in client application