This mornings cries of users across the network...

I've come in to find Error 633: The port is already in use or is not configured for RAS dial out.

I'm using NT Server 4 with Exchange 5.5 and a dial up. It was all working yesterday (and for the past 6 months!) with no problem. The modem is not in use by another program and is configured for RAS but it still gives the error.

Any suggestions - preferrably that don't involve a reboot, or I'm likely to have heavy objects thrown in my direction.

Many Thanks.