Mac Migration Assistant is an excellent tool that helps users transfer files, applications, and settings from one Mac to another. However, sometimes the process doesn’t go smoothly, leaving users frustrated and searching for solutions. If you’re experiencing issues with Migration Assistant, you’re not alone. There are several reasons why it might not work properly and several steps you can take to troubleshoot it.
Possible Reasons Why Migration Assistant Isn’t Working
There are multiple factors that can cause Migration Assistant to fail. Here are the most common reasons:
- Network Connectivity Issues: If you’re trying to transfer data wirelessly, unstable Wi-Fi or network conflicts can disrupt the process.
- Software Compatibility Problems: Different macOS versions on the source and target machines may cause issues.
- Interference from Antivirus or Firewalls: Security software might be blocking the connection between the two Macs.
- Corrupted Data: If some files are damaged or corrupted, Migration Assistant might struggle to transfer them.
- Incompatible Transfer Methods: Some versions of macOS require specific migration methods, such as using an Ethernet cable instead of Wi-Fi.

How to Fix Migration Assistant Issues
Now that we’ve identified the possible issues, let’s look at how you can resolve them.
1. Check Your Network Connection
If you’re using Wi-Fi to transfer data, make sure both Macs are connected to the same network. For a more stable connection, it’s often better to use an Ethernet cable:
- Use a Gigabit Ethernet cable if possible.
- Disable other network connections to avoid interference.
- Restart both Macs and reconnect to the network.
2. Update macOS on Both Macs
Ensure that both Macs are running the latest version of macOS, as older versions may not be fully compatible with newer ones. To update:
- Go to System Settings (or System Preferences on older macOS versions).
- Click on Software Update.
- Install any available updates before retrying Migration Assistant.
3. Disable Firewalls and Security Software
Firewalls or third-party security tools can sometimes block Migration Assistant. Try disabling them temporarily:
- Go to System Settings > Network > Firewall and turn it off.
- Disable any third-party antivirus software.
- Restart your Mac and try the migration again.

4. Use the Correct Transfer Method
Depending on your macOS version, the recommended migration method may vary. Here’s what you should try:
- Wi-Fi or Ethernet: Best for newer macOS versions and faster networks.
- Time Machine Backup: Good option if direct transfers aren’t working.
- Target Disk Mode: Requires a Thunderbolt or USB-C connection.
5. Restart Migration Assistant Properly
Sometimes, a simple restart can solve unexpected glitches:
- Close Migration Assistant on both Macs.
- Restart both computers.
- Ensure that no other apps or processes are running in the background.
- Start Migration Assistant again and retry the transfer.
6. Check for Corrupt Files
If the transfer keeps failing at a certain file, you may have corrupt files causing the issue. Try these steps:
- Manually check large files and media.
- Copy suspect files to an external drive and transfer them separately.
- Use macOS Disk Utility to check the disk for errors.
Alternative Methods for Data Transfer
If Migration Assistant still isn’t working, you can try other options:
- iCloud Drive: Upload your files to iCloud and download them on the new Mac.
- External Hard Drive: Manually copy your files using an external storage device.
- AirDrop: Send files wirelessly between the two Macs.
Final Thoughts
Mac Migration Assistant is a powerful tool, but it can sometimes run into hurdles. By checking network connections, updating software, disabling firewalls, and testing alternative transfer methods, you should be able to resolve most migration issues. If all else fails, manually transferring your files or using an external hard drive may be the best alternative.
Have you encountered any other Migration Assistant issues? Share your experiences or solutions in the comments!