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?