Errors

"0x80070005 Access is denied" is an error message associated with COM and DCOM. The error likely indicates that your OPC Client cannot access the OPC Server due to COM or DCOM security settings.  To change these, you will have to access the DCOMCNFG tool and allow this communication. This holds true for both a user account, and the system account.  You can configure your COM and DCOM through use of the following documents (in pdf format):

DCOM on Windows NT/2000
DCOM on Windows XP/XP SP1/2003
DCOM on Windows XP SP2/2003 SP1

If you are experiencing DCOM issues across domains or while using workgroups, we strongly recommend downloading and installing MatrikonOPC Tunneller. MatrikonOPC Tunneller eliminates DCOM setup headaches and gets data flowing seamlessly between your servers and clients using TCP/IP.  Tunneller can also be used to ensure secure communication across firewalls.