@ The Warlock
When you use the NoCD crack you get the 'MOD' folder and 2 other files the 'BfVietnam.exe' and the 'BfVietnam.org'. As far as I remember you have to copy all these files to the install folder even the 'BfVietnam.org' file. I used to have the data differs from server error when I used to play LAN with my sons but then i read somewhere on fileforums that this particular file (the BfVietnam.org) provided with the nocd cracks has to copied over as well. And when I did that i had no more data differs from server errors. I hope this is what you were after!
