COM management
From OPC Labs Knowledge Base
This article applies to QuickOPC 2022.1 and later.
(TBD)
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- Console apps in C#
- The main method runs on an MTA thread, unless specified otherwise. This is generally good, because it prevents premature COM security initialization. If COM security initialization fails with RPC_E_TOO_LATE, and there is an [STAThread] attribute on the program's main method, remove it. If it still fails with RPC_E_TOO_LATE, add a ComManagement.Instance.AssureSecurityInitialization() call to the very beginning of the program's main method.
- Console apps in VB.NET
- The main method runs on an STA thread, unless specified otherwise. This causes a premature COM security initialization. If there is an <STAThread> attribute on the program's main method, remove it. Then, add an <MTAThread> attribute to the program's main method. If the COM security initialization still fails with RPC_E_TOO_LATE, add a ComManagement.Instance.AssureSecurityInitialization() call to the very beginning of the program's main method.
Configuring COM
COM security initialization
Dealing with CVE-2021-26414
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COM settings in OPC Classic client components
KB5004442—Manage changes for Windows DCOM Server Security Feature Bypass (CVE-2021-26414)
