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I tried to setup another computer with a Bluetooth dongle to connect my Macbook Pro (OS X Mavericks). I managed to pair them and ever since then I get these messages every 10-30 seconds and often they crash and freeze the BT:

A bluetooth serial failure has occurred.
Failed to open an RFCOMM serial channel.
Check if authentication needs to be enabled in your device.

I removed the offending Bluetooth dongle from the favourites and deleted the com.apple.bluetooth.plist file, yet the dongle keeps trying to connect and the error messages keep popping up.

How can I block that dongle from connecting?

Error dialog

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    Any luck? I have a similar problem. I'm trying to read the serial port for the paired device. Starting a screen session on the port results into this error for me. – Chirantan Oct 14 '14 at 12:33

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