https://forge.codesys.com/tol/cforge/tickets/34/2026-05-06T10:57:04ZRecent changes to 34: Unable to Connect To OPC Ua server through UserName identity2026-05-06T10:57:04Z2026-05-06T10:57:04Zkiranbsiddaiahhttps://forge.codesys.com/u/kiranbsiddaiah/https://forge.codesys.com279c681319a2d3a3b6d112752b7074746771d9be

<div class="markdown_content"><p>Hi Team, i'm using the codesys to create an opc ua client to read the data from "Prosys OPC UA server simulation" tool .. I can able to connect to the server with anonymous authentication ... <br/> But when i tried to connect with user name authentication if fails to disconnect and does not return any errorID ... I have fixed security_check_failed error by trusting the client certificate on server side and also fixed invalid_certificate issue by trusting the server cetificate on client side .. After fixing these to error it fails to connect with NO_ERROR message. </p> <p>And i also noticed an error message like "Demo mode for CmpOPCUAClient started. Will expire and stop!" in the device log tab .</p> <p>please let me know the changes required to establish the connection ...</p></div>