Configuring Veeam Agent for Microsoft Windows on servers with Microsoft DirectAccess enabled

Challenge

The backup job ​on Microsoft Windows Server OS with DirectAccess server enabled fails with the following error message:
 

Error: The remote procedure call failed and did not execute RPC function call failed. Function name: [GetSvcVersion]. Target machine: [xxx.xxx.xxx.xxx]

Cause

Microsoft DirectAccess locks ports 6000-47000. You can use the following PowerShell command to verify this:
 

Get-NetNatTransitionConfiguration

Solution

Change the custom port for RPC_transport to any idle port, which is outside the 6000-47000 range by editing the following registry key:
 

HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Endpoint Backup\EndPoint_Rpc_Transport_Port