The most common OPC DataHub security configuration is simply to allow only authorized users to connect via TCP or via a tunnel/mirror, and to allow any users to connect via DDE. To do this, follow these steps:
The result of these steps will be:
If the anonymous user has no permissions, then a connecting program cannot read or write data until it has authenticated, or until it is promoted to a protocol user.
If the client is connecting via DDE, it can interact with the data as a user of those protocols.
The Mirror and TCP connections are given the same permissions as anonymous, blocking all activity by anonymous users on those interfaces.
Connections on TCP or mirror/tunnel connections that authenticate with a valid user name and password will be given the necessary permissions to interact with the OPC DataHub's data.
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