Fix macOS "Universal Control" Not Connecting

Is your mouse or keyboard failing to move between your Mac and iPad?

Recommended Troubleshooting Tool

Before proceeding with manual fixes, we recommend using OnyX. The preferred tool for deep system maintenance and resetting the macOS Bluetooth stack.

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The Symptom

The cursor stops at the edge of the screen and won't "push through" to the other device, even though both are side-by-side.

The Fix

1. The Proximity Reset

Ensure both devices are within 3 feet (1 meter) of each other. Toggle Bluetooth and Wi-Fi OFF and then ON on both devices.

1. Check Display Arrangement

Go to System Settings > Displays > Arrange. Ensure the iPad is positioned correctly relative to your Mac's screen.

1. Reset the Handoff Daemon

Terminal:

killall sharingd

Fix 3: The Connectivity Optimization

When old pairing records interfere with the Universal Control handshake.

Recommended Tool: CleanMyMac X

- Maintenance Module: Flush the DNS cache and reset the network stack to ensure the local peer-to-peer discovery is functioning correctly.

- Optimization: Identify background network tools (like VPNs) that might be blocking the local ports required for Universal Control.

[Link: Fix Universal Control with CleanMyMac X]