Starting with Industrial HiVision 08.1.04 / 08.2.00 the OPC-UA server only allows encrypted communication.
If you want to enable unecrypted communication again you have to add following line to the <install-dir>/lib/opcua/config/server.properties file:
OpcUaServer.AllowUnencrypted=true
After saving the properties file, please restart the Industrial HiVision services for the changes to take effect!