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Establishing OPC Communication on Windows XP SP2 and Windows 2003 SP1
July 4, 2006
Matrikon Inc. 10405 Jasper Avenue Suite 1800 Edmonton, AB T5J 3N4 Canada Phone [phone] Fax [phone] Web www.matrikon.com Support Site www.opcsupport.com

Users will often experience difficulties with OPC Communication on Windows XP SP2 and Windows 2003 SP1 due to advanced security settings. This document describes how to disable these security settings to allow OPC Communication. DCOM Security Settings OPC uses ActiveX COM and DCOM to communicate, so we must open our DCOM permissions to allow this. 1. Go to ‘Start->Run’

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2. Type in ‘dcomcnfg’ and click OK.

3. Go to ‘Console Root->Component Services->Computers->My Computer’. Right-click on ‘My Computer’ and select ‘Properties’.

4. Go to the ‘Default Properties’ tab and ensure that your Window matches the one shown below:

5. Go to the ‘COM Security’ tab. Under ‘Access Permissions’, click on the ‘Edit Limits’ button.

6. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

7. Under ‘Access Permissions’, select the ‘Edit Default’ button.

8. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

9. Under ‘Launch and Activation Permissions’, select ‘Edit Limits’.

10. Ensure that you have allowed permissions to ‘Anonymous Logon’, ‘Everyone’, ‘Interactive’, ‘Network’, and ‘System’ as shown below. Then click OK.

11. Under ‘Launch and Activation