EXFO FTB-500 (Window XP) - Manual (Page 215)

Preparing for Automation
FTB-500 205
Configuring DCOM Access to Your Unit
11. Click the COM Security tab and, under Access Permissions, click Edit
Limits.
12. In the Access Permission dialog box, ensure that, for ANONYMOUS
LOGON, local and remote accesses are allowed.
If ANONYMOUS LOGON is not listed under Group or user names,
click Add to add it.
For more information on enabling events with DCOM, refer to
AppId Key in MSDN Documentation.