It very well could be the school's "software" filtering URL's.
[Off Topic]
I know at my school, you cannot load my site,
http://nedren.elementfx.com, because they blocked it from me.
I did do a few things to cause that though, and almost was suspended from school for it.. :-\
[/Off Topic]
(They should make an "off topic" thing for VB, it would be quite cool.. :-0 )