Replication of a Windows machine doesn't start due to COMException

Replication of a Windows machine doesn't start due to COMException

Challenge

Cannot start backup, error message: COMException: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA).

Cause

This a Windows issue related to the Microsoft Volume Snapshot Service (VSS).

Solution

Perform the following steps:
  1. fill the Volume Shadow Service (VSS) storage, HWRAgent will show an error;
  2. disable the VSS;
  3. free space in the VSS;
  4. enable the VSS service;
  5. restart the agent.
Restart the agent in case of a similar error:
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

The problem should be fixed.