Read service is denied for client - by: mpedro

Hello,
i'm reading a Rockwell PLC using OpcLabs and a windows console application developed in C#. Since 2017 i'm using easyOPC libraries and so far I didn't have any problems. the issue appears when using OPC UA and every 1-2 weeks because I get the following error:
-Read service is denied for client <Opclabs.EasyOpc.UA.implementations.netsdk.easyUAsession...

I have an OPC server configurated with anonymous authentication and security none. What it makes nonsense for me is the error telling read is denied...

how i read:
UAAttributeData v = new UAAttributeData();
v= _servidor.Read(serverString, tagName);

Is it a bug or a wrong configuration?

Thanks for the help