COM management

From OPC Labs Knowledge Base
Revision as of 15:39, 15 February 2022 by User (talk | contribs) (→‎!!!)


This article applies to QuickOPC 2022.1 and later.


(TBD)

!!!

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

!!!

COM settings in OPC Classic client components

CVE-2021-26414

KB5004442—Manage changes for Windows DCOM Server Security Feature Bypass (CVE-2021-26414)

What's new in QuickOPC 2022.1