This might be a very specific case, but maybe there is a solution for it.
I started Duplicati (2.1.0.5_stable_2025-03-04) on my Win11y64 machine but quit using the Tray Icon shortly afterwards because I did not have the time to run a missed backup. I was seemingly too late - indicated by traffic on destination. Duplicati.GUI.TrayIcon.exe was no more running anyways. To be able to at least see backup progress I restarted Duplicati.GUI.TrayIcon.exe but that led only to a browser window opening with the UI address URL, the Duplicati.GUI.TrayIcon.exestill did not appear in task manager. The UI URL consequently did not load because the web server was not available. Only after finishing the backup, I could finally restart Duplicati.GUI.TrayIcon.exe and access the UI.
Is there a way to make the UI accessible during backup in the very case of Duplicati.GUI.TrayIcon.exe having been quit beforehand? I do not have a setup where the Duplicati.GUI.TrayIcon.exe is detached from Server component.
If this is a default setup started from the Start menu or desktop icon, test command line start.
That way you can at least get a better idea of why it doesn’t start. Also watch Task Manager.
Alternatively (or if ambitious), look at the Application log for events from Duplicati, .NET, etc.
One thing I can think of why active backup Quit is different is I think icon stops before upload.
Maybe that’s what you’re saying? Do you mean all was back to normal after uploads ended?
The description confuses me when saying TrayIcon.exe was “no more running” at restart fail. Possibly that’s based on the icon not showing, but the process was actually still running then.
You are right, I encountered different exceptional behaviors yesterday and I must have confused when writing them down. The process still existed in Task Manager, that was the reason I could infer that a backup was running even though the UI was not available.
Okay, will try in case it re-occurs, thanks for the suggestion!
I try to recall what exactly happened, I think at some point in time the Duplicati.GUI.TrayIcon.exe disappeared from Task Manager which led me to think the backup was finished and I tried starting the application then and was successful.