I want to know if I can use for OPC server client authentication any account with adminstrator privileges. Because we tried to connect OPC client to OPC server with admin., but I didn't receive data from the server. Thanks.
In OPC Authentication is currently handled by DCOM Security. This means that you have to ensure that DCOM Security is set on any PC involved in the OPC connection. Most OPC vendors will relax DCOM security requirements as much as possible and will even provide documentation that shows how to open it as wide as possible. Some things to consider:
1. DCOM Security is inherited by OPC Products from Microsoft as part of the COM+ layer. OPC is based on COM+ technology.
2. DCOM is really intended for use in Domains. You cannot connect from one domain to another without a tunneling product.
3. You cannot do any OPC event based processing through VPNs due to the nature of the connection process via VPNs.
Check out Kepware's DCOM Configuration Manual, which describes DCOM settings used with its products but is applicable to all OPC products.
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