EXFO FTB-500 (Window XP) - Manual (Page 201)

Preparing for Automation
FTB-500 191
Configuring DCOM Access to Your Unit
6. Confirm the newly added user has remote access permission as
follows:
6a. In the Access Permission dialog box, select the name of the new
user.
6b. Under Permissions for (new user), ensure Allow is selected for
Remote Access.
6c. Click OK.
7. In the My Computer Properties dialog box, click the COM Security
tab.
8. Under Access Permissions, click Edit Limits.