Hey again, "1. Are you using the PLC Engineering Tool from the same system where the browser is running on which shows the error?" -> Usually not. The PLC Engineering Tool runs on a Windows-PC and the HMI runs on a Unix system. After the freezing, I tried to connect to the HMI with both of them and also a Android Smartphone, butneither of them worked. "2. What is the URL of the HMI and of the Runtime Manager you are using?" HMI: [ctrlX-URL]:10123/projekt_name/ and Runtime Manager: [ctrlX-URL]:10123/.webui/ "3. Which error is logged in the OPC-UA server log when the connection issue occurs? (asked before)" So far, I only get the following warning: "OPC UA Server warning User has not the required permission OPC UA StatusCode: 0x80210000". But after this warning is shown, the HMI still works fine. Today I rediscovered the issue after about 1,5 h after starting the ctrlX and HMI. During that time, I’ve updated the PLC program, successfully checked a few times if the HMI is still running but suddenly it stopped accepting inputs. It still updates the items and alarms on the HMI though and shows no new warnings in the ctrlX OPC UA Log. Furthermore, although the items are still updated, I can not reload the HMI URL, images are not loaded after switching tabs on the HMI, the Designer cannot connect to the server and the WEBUI also timeouts while loading. "4. Does the issue also occur if you temporarily disable a firewall and antivirus software on the system you are accessing it from?" Unfortunately, not.
... View more