Solving 'Failed to Start Monitoring Emulator-5554' in Android

In this guide, we will discuss how to troubleshoot and fix the "Failed to Start Monitoring Emulator-5554" error in Android development. This error can occur while using Android Studio or other Android development tools when trying to run an emulator or connect an Android device.

Table of Contents


Before proceeding, make sure you have the following installed:

  1. Android Studio
  2. Android SDK Tools
  3. Android Emulator

Step 1: Check ADB Connection

First, check if the Android Debug Bridge (ADB) is successfully connecting to your emulator or device. Open a command prompt or terminal window and execute the following command:

adb devices

If your device or emulator is listed, proceed to Step 2. If not, check your device or emulator configuration and ensure that USB debugging is enabled.

Step 2: Kill and Restart ADB Server

Sometimes, restarting the ADB server can resolve the "Failed to Start Monitoring Emulator-5554" error. To do this, execute the following commands in the command prompt or terminal:

adb kill-server
adb start-server

After restarting the ADB server, re-run the adb devices command to check if your device or emulator is now listed.

Step 3: Check for Conflicting Programs

Some programs, such as Genymotion or other Android emulators, might conflict with the ADB server. Close any other Android emulators or tools and try running your emulator or connecting your device again.

Step 4: Update Android Studio and SDK Tools

Outdated tools and software might cause the "Failed to Start Monitoring Emulator-5554" error. Update Android Studio and the Android SDK tools to their latest versions. You can check for updates within Android Studio by clicking on Help > Check for Updates (Windows/Linux) or Android Studio > Check for Updates (macOS).

Step 5: Check for Firewall or Antivirus Interference

Firewalls or antivirus software might block or interfere with ADB communication. Temporarily disable your firewall or antivirus software and check if the issue persists. If the issue is resolved, add an exception for ADB in your firewall or antivirus settings.


Q: How do I enable USB debugging on my Android device?

To enable USB debugging, follow these steps:

  1. Open the Settings app on your Android device.
  2. Scroll down and select About phone or About device.
  3. Locate the Build number and tap it 7 times to enable Developer options.
  4. Go back to the main Settings menu and tap Developer options.
  5. Enable the USB debugging toggle switch.

Q: How do I find the path to my ADB executable?

In Android Studio, go to File > Project Structure > SDK Location. The ADB executable is located in the platform-tools folder within the Android SDK directory.

Q: Can I use multiple Android devices or emulators simultaneously?

Yes, you can use multiple devices or emulators simultaneously. However, you might encounter issues if there are conflicts between different emulators or tools. Make sure all your tools and software are updated to the latest versions to minimize potential conflicts.

Q: What ports does ADB use for communication?

ADB uses TCP ports 5554 and 5555 for communication. Make sure these ports are not blocked by your firewall or antivirus software.

Q: How do I uninstall the Android SDK Tools?

To uninstall the Android SDK Tools, simply delete the entire Android SDK folder from your computer. If you installed the SDK using Android Studio, you can find the SDK folder in the File > Project Structure > SDK Location menu.

  1. Android Studio User Guide
  2. Android Emulator Documentation
  3. ADB Documentation
  4. Android Developer Guide

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