Well it appears you westell is a piece of junk the link below has 75 post to it with the same problem you have. And that is just 1 thread. There are several threads about the Westell 327v it appears that Verizon is replacing them with different ones if you gripe enough. I did not read all of the post in the thread but I did read a quite a few. The second thread suggest if you use the 50 half open port patch in windows XP it will fix the problem. You can get the patch at the third link.
http://www.dslreports.com/forum/remark,13747078 http://www.dslreports.com/forum/remark,16038032 http://lvllord.de/?lang=en&url=downloads