Could not open RFCOMM channel. (urgent)

Hi,

i have a urgent problem on my company MBP.

I will use Tethering on my conpany Nokia E51.

I can pair it with the Mac but when i will connect with the Internet i get a error that no RFCOMM channel is open or could open.

But now the strange think.

On my private MBP i cann connect with the same phone to the Internet.

On both are Lion 10.7.3 installed with all Updates.

The phone trusts the MBP.

I don't know what this is and i need it today (sunday) on a business trip.

Please Help me.