If you are using a WG(WorkGroup) or WG to Domain or Domain WG you need to make sure the OPC users in the Domain are built into the local security account of the WG PC(s). It is intended for use in Domains which have a central Access Control List.COM/DCOM, which is what OPC uses as a core technology, does not work well, and usually not at all, across multiple domains.If that does not work then you can always go the rout of opening DCOM as wide as possible. Remember these files need to be properly registerd on both PC's. Reboot and try to connect to the server again.
Click OK and type exit to close the command prompt window.A dialog box should appear saying: DllRegisterServer in oleaut32.dll succeeded.A dialog box should appear saying: DllRegisterServer in ole32.dll succeeded.
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