TopView OPC cannot connect as Service
This article is useful if TopView connects to your OPC server when run interactively, but cannot connect to remote OPC Server(s) when you run TopView as a Service.
Interactive applications (non-Service) run under the account of the logged in user, services run under the configured logon account for the Service. Ensure TopView is running under the expected user account, especially after launching TopView from an elevated Configurator application.
The task manager’s process details will show the user account under which a process is running. Look for TopView.exe or TVConfig.exe.
OPC Servers use DCOM for the remote connection and often grants or refuses incoming connections from TopView based on the user account. The solution is to configure DCOM to allow connections from the TopView Service Logon account. Please see the following page for DCOM configuration information.
Related Articles
ClearSCADA connection fails with: "Error: CheckConnectionToServer > error creating group : AddGroup failed with error"
If you receive an error connecting to ClearSCADA with the following error message: ClearSCADA can be set up to use OPC private security and require credentials for permissions to connect to the server and retrieve tag values. To connect, provide the ...
TopView engine unable to connect to OPC UA server: SHA 1 Certificates are not trusted
Issue The TopView engine was unable to connect to the OPC UA server due to certificate issues. When inspecting the logs, we could see similar error messages to those that would occasionally appear when testing connections. This issue may show as the ...
Citect OPC Server on Windows 7
This is a general support posting regarding TopView OPC communicating to Citect OPC Server on Windows 7. The two issues that a TopView user may experience are: TopView can connect to the OPC Server but reports that the server is not in a “running” ...
Keeping TopView healthy
Like all software, TopView is running in an environment that is under constant change. OS updates, protocol versions updates, email authentication deprecations, and other things can affect the health of your TopView system. Even systems off the ...
OPCUA tag search - returned tag format
If you experience issues with full Browse Paths being unable to be resolved by TopView's OPC UA tooling, you have other options to return Node IDs or browse paths combined with Node IDs from TopView's "Add tags"/ tag search dialog. In TopView 7.2 and ...