Getting Timeout Error when Try to connect Surrogate in Matrikon
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You can access data in accounts with administrator priviliges at 800xa End.
But at OPC client end which you wrote is in Workgroup, you can only access data OPCUser only.
If you trying communication with basic DCOM Settings,both machines should have same username and password.
Another option is you can use any data manager or matrikon tunneller software.