Hello, i have the same issue with V3.5 SP16 (64bit) and the Soft PLC CoDeSys Control Win V3 x64. When i try to follow the steps described in the online help with a small demo project there is no OPC UA Server available. https://help.codesys.com/webapp/_cds_runtime_opc_ua_server;product=codesys;version=3.5.16.0 Any hints to solve the problem are very welcome!