What session lock does

Active session lock prevents the same browser profile from being opened on multiple devices at the same time. This protects your data, fingerprint settings, and sync states from getting messed up.

Why session lock is useful

• Protects data: avoids lost cookies, form data, or unsaved work
• Prevents syncing issues: keeps profile sessions from clashing between devices
• Keeps fingerprints consistent: avoids detection from conflicting profile behavior

How session lock works

When a profile is running on Device A, it can’t be opened on Device B at the same time. If you try, you’ll see a padlock icon instead of the launch/stop buttons.

How to unlock or stop an active session

Normal stop

Click the “Stop” button in the profile list. That safely ends the session and unlocks the profile. 

If a profile stays locked

1. Hover over the lock icon and click “Unlock” or click “Unlock all” in the top-right of the dashboard
2. Refresh the page – the padlock will disappear

If you don’t see the “Unlock profiles” button

.lock files

.lock files are temporary files apps make to show a file or resource is in use. Here's why you can delete them:

• Fix stuck apps: if an app crashes, leftover .lock files can trick the system into thinking it’s still running
• Stop errors: these files might block your app from starting or working properly
• Clear update problems: if an update or sync gets interrupted, .lock files can block future attempts

Deleting .lock files is like hitting reset – it clears up the mess and lets your app run smoothly again! 

Windows

1. Stop all running profiles
2. Close the desktop app 🖥️ or disconnect the agent if you're using the web interface 🌐
3. Go to the mlx folder in your user folder: C:\Users\%username%\mlx
4. Delete all the .lock files

 

 

macOS

1. Stop all running profiles
2. Close the desktop app 🖥️ or disconnect the agent if you're using the web interface 🌐
3. Go to the mlx folder in your user folder: /Users/%username%/mlx
4. Delete all the .lock files

 

 

Pro tips

• Always close profiles using the Multilogin “Stop” button
• Keep a habit of refreshing the dashboard if things seem stuck

FAQs

Why is my profile still locked after closing?

It might’ve crashed or closed incorrectly. Use the unlock steps above to fix it.

Can I force-open a profile on another device?

Nope – and that’s on purpose. It’s meant to keep your data and identity safe.

What does the padlock icon mean?

It means the session is still running somewhere – or Multilogin thinks it is.