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OS upgrade and authentication/pairing

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PostPosted: Fri Apr 29, 2005 10:32 am    Post subject: OS upgrade and authentication/pairing Reply with quote

When you pair a Bluetooth device with your Mac, both your Mac and the device will store a shared key that will be used later, when authentication is required for a connection.

When upgrading the operating system, there is a chance your Mac loses its copy of the shared key. This is certainly the case if you do a clean install! Normally, this wouldn't be a big problem, as attempts to open a connection requiring authentication would cause another pairing sequence, but I've seen cases where the OS instead just fails blank with an error message.

Remove the shared key (usually denoted "Trusted device", or "Bluetooth devices") from both your device and your Mac. Then pair again using Bluetooth Setup Assistant. This will make sure both sides have the same shared key.

Side note 1:
The same problem can occur if you have a dual-boot setup so that two OS partitions on your hard drive alternately share the same Bluetooth adapter (which has *one* unique MAC hardware address). The "other end" (typically your phone or PDA) will get confused as it thinks it's talking to the same trusted party, expecting it to have a copy of a specific shared key. A similar case is where you alternately use the same adapter with multiple computers.

Sorry if this got a bit technical. Hopefully, it'll help someone.

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