Subject: odd problem with a established PPTP VPN connecting a portable using a SPRINT 595U aircard to my home network.

OS's, Equipment, and configurations:

On My Home Network Side:
 a M0n0wall APPLIANCE using a Wrap 2e board running the LATEST firmware update.
 It has a built-in PPTP VPN server that is enabled and allowing a authenticated user to pass ANY protocols to ANY LAN subnet on my network.

I can successfully ping in both directions.
I can see shares normally from within my network


On The Portable:
Windows XP Home,
A dial-up connectoid to connect to the internet running PPP and TCP/IP, File & Print Share, Client For MS networks for protocols - NO LOCAL FIREWALLS This connectoid performs flawlessly to the I-net.

A second connectoid to connect to the VPN running PPTP VPN and TCP/IP, File & Print Share, Client For MS networks for protocols - NO LOCAL FIREWALLS.

These connectoids WORK in as much as:
A.  I CAN browse the web pages served from devices on my home network
B.  I can FTP to any of my FTP enabled devices on my home network.
C.  I am able to ping to machines within my home network.
D.  I CAN click on: "My Network Places"-"Entire Network"-"Microsoft Windows Network"
     and see my workgroup name which is NOT "workgroup".

HOWEVER, IF I click that workgroup name, expecting to see a list of machines that have MS shares on them. I get a long pause, then a error message: " XXXX is not accessible. You might not have permission...."

If I simply disconnect the Sprint thing, and connect the portable via the LAN jack using the SAME protocols.  I SEE what I expect to see.


WHAT is wrong?   I have spent (No joke) at LEAST 70 hours trying to figure out HOW to setup this thing and this weird problem.  A 2 hour call to Sprint 's level 2 support and ultimately their subject matter expert  ultimately got this reply: " We Don't know"   Which, was a honest answer from them, and WAYYYYY beyond their normal scope.

Thank you all.