Siemens SIMATIC NET Manual page 269

New as of Windows XP + SP2:
As of Service Pack 2 for Windows XP, communication over OPC also requires the
following permissions to be set up:
S Local and remote launch for the ANONYMOUS LOGON in Launch Permission;
S Local and remote activation for Anonymous Logon in Launch Permission;
S Local and remote access for the Anonymous Logon in Access Permission
The settings are made automatically when you install the SIMATIC NET CD.
Multiterminal Mode
In multiterminal mode with the identity "This user" for the OPC server, you must
assign standard permissions to the "This user" entry.
Commissioning PC Stations - Manual and Quick Start
Release 5/2005
C79000-G8976-C156-07
18 DCOM Settings with the dcomcnfg System Program
269