Software⏱️ 2 min read📅 2026-05-29

How to Fix: QML Profiler Debug connection failed

QML Profiler Debug connection failed on Android QT Quick project in Qt Creator 19.0.2.

Quick Answer: Check the QML Debugger settings and ensure that the debug server is running correctly.

The 'QML Profiler Debug connection failed' error in Qt Creator can be frustrating, especially when you're trying to optimize the performance of your Android application.

🔍 Why This Happens

  • One common cause for this issue is that the QML Debugger does not have permission to bind to a specific port.

🚀 How to Resolve This Issue

Method 1: Check Port Permissions

  1. Step 1: Open the Qt Creator's Project Settings by going to Run > Run Configurations..., then select the Application tab and look for the Port field.

Method 2: Increase Debug Port Range

  1. Step 1: Open the Qt Creator's Project Settings by going to Run > Run Configurations..., then select the Application tab and look for the Port field.

Step 2: Increase the Debug Port Range by setting it to a value above 1023, such as 1025 or higher. This will allow the QML Debugger to bind to a different port.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'QML Profiler Debug connection failed' error in Qt Creator and optimize the performance of your Android application.

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