Fixing “ADB Wireless Pairing — protocol fault (couldn’t read status message): Undefined error: 0”

If you’re trying to pair your Android device using ADB wireless debugging and you get this error:

error: protocol fault (couldn't read status message): Undefined error: 0

You’re not alone. This one is particularly frustrating because:

• The IP and port are correct
• adb devices works
• Wired debugging works
• No firewall or VPN issues
• Port connectivity even succeeds

Yet pairing still fails.

I recently ran into this exact issue on macOS while trying to pair using:

adb pair 192.168.1.xxx:xxxxx <pairing_code>

After a lot of debugging, the fix turned out to be surprisingly simple.

The Fix

Follow these steps:

1. Disable Wireless Debugging on the device

Go to:

Developer Options → Wireless debugging → Disable

2. Reboot your Android device

This clears stale pairing state and TLS keys.

3. Restart ADB

On your computer:

adb kill-server

4. Start ADB in foreground mode

adb nodaemon server

Leave this terminal open.

5. Enable Wireless Debugging again

On your Android device:

Developer Options → Wireless debugging → Enable
→ Pair device with pairing code

6. Pair from another terminal

Open a new terminal and run:

adb pair <ip>:<port> <pairing_code>

Example:

adb pair 192.168.1.213:44649 389479

Why This Works

ADB wireless debugging uses:

• TLS certificates
• Temporary pairing keys
• Ephemeral ports

Sometimes the Android device keeps stale pairing state, causing it to silently reject new connections.

Rebooting and restarting ADB forces a clean TLS handshake, which resolves the issue.

Hopefully this saves someone else from going down the same debugging rabbit hole.