.NET Based OPC UA Client/Server SDK  3.3.1.531
Using the SDK in a Windows Service

Integrating SDK into your own Windows Service

If you get startup issues while using an application built with the SDK inside your own Windows Service implementation instead of the SKDs own Windows Service functionality, you should set the property NoAutoStartService to true.

This will avoid the SDK to start its own service implementation in case it was started in a non-interactive environment.