Siemens SIMATIC NET Manual page 256

18 DCOM Settings with the dcomcnfg System Program
Settings
When operating in a domain, the default authentication level can by set to
"Connect" and the Default Impersonation Level to "Identify" for security reasons. In
this case the relevant accounts must be specified in the "Default Security" (see
Section 18.3).
For DCOM operation with the OPC server within a workgroup (no domain server
available for authentication) make the settings as shown here.
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Commissioning PC Stations - Manual and Quick Start
C79000-G8976-C156-07
Release 5/2005