configuring routing and remote access dialup port problem

[ajt1]

Hi,
I've been carefully following the instructions for getting NAT installed onto my win2k server with adsl internet connection to allow machines on my home network to run VPN connections.

Unfortunately I get an error message when trying "To enable routing on ports" as in the instructions.

basically everything is working fine until i come to enable "demand-dial routing connections"
this is in the "routing and remote access" network administrative tool under server-name->ports->properties->configure.
once i have checked the button, hit okay, then get returned to the "ports properties dialog" when applying, or okaying get the message
"The port information cannot be saved.
Cannot complete this function.
(800703eb)
"
which is not very helpful.

This is a win2k server, all the latest patches, and i'm attempting to use an alcatel USB adsl modem as the outgoing port, and doing this as a user with admin privelges.

any help or suggestions, or even howto avoid the error would be greatly appreciated.
thanks in advance

alistair