Unable to use QML Debugging - QAbstractSocket issue ?

[Benjamin07 0]

Dear all,

I really would appreciate your help on this issue I am facing.
I am working on a C++/QML project and I cannot make the QML Debugger work. I can debug the C++ part but not the QML part. I keep having the following error messages in the journal when running my program in debug mode:

QML Debugger: Socket state changed to QAbstractSocket::HostLookupState
QML Debugger: Socket state changed to QAbstractSocket::ConnectingState

QML Debugger: Socket state changed to QAbstractSocket::UnconnectedState
QML Debugger: Error: QAbstractSocket::ConnectionRefusedError

Please note that I have :

• Enable QML debugging and profiling (build step)
• Enable QML (Run > Debugger Settings)

I am using Qt 5.11.1 MSVC2017_64bit, Qt creator 4.7.0

Thank you for your help !

[kkoehne]

It looks like the debugger tries to connect to the application via a port, but that fails.

What does the Application Output of the app say? Do you maybe have a firewall that blocks localhost connections?

[Benjamin07 0]

Thank you @kkoehne for trying to help.

The application output only displays : "15:17:30: Debugging starts"
I think you are right when you say that it must be a firewall related issue.... so:

• I tried to debug one of the QML example (Map Viewer) and the MS Windows firewall pop up asking me if I allowed this application which I did. I then could debug the example without problem.
• I even tried removing the QML example from the authorized application list and when debugging the same pop-up appears again
• I have never seen this popup when debugging my own application
• I tried anyway to add my .exe in the authorized applications list but it does not change anything

I am really wondering what I am missing here...

[Benjamin07 0]

@Benjamin07-0 said in Unable to use QML Debugging - QAbstractSocket issue ?:

I think you are right when you say that it must be a firewall related issue

To complete... I actually tried to turn off the firewall temporarily, restart Qt Creator, re-run my application in debug mode but no luck. Still the same error message...

[Benjamin07 0]

Just an update on this issue. The problem is now solved for a reason I ignore. I haven't changed anything (well at least that I remember of) on the project configuration but the QML debugger is now operational. Several thoughts:

• windows (firewall) update
• antivirus update

Anyway I mark the problem as resolved even if no clear and repeatable solution has been identified.