ISA 2004 Site Vpn Re-Connection Problem

Hi There,

I've got an Main office and a Site office.  Both are running Windows Server 2003 R2 and ISA 2004.  We've got a Demand Dial vpn site connect between the two sites.  My problem is the site office will go down once every so many hours and will never reconnect.  I'll reboot the site office isa server, and when it comes up, the connection will reconnect without a problem.  I think it has something to do with once the isa box gets disconnected it doesn't close the port or something like that.  Also, if the main office try's to reconnect after the site goes down, the main office connection will connect as a 'Remote Access Connection'  not a 'Network Interface' connection.

The error message I'm getting when we try to reconnect is:

An error occured during connection of the interface.
The modem (or other connecting device) has reported an error.

Any help would be great.

Thanks,

Steven.