I'm a little confused, but my gut tells me "boneheaded".  :-) 

Where does your web service reside?  On your home PC?  If so, it simply won't work because your ISP blocks port 80.  This is usually the case because hosting any services on a home ISP account is a violation of terms of service.  Aside from using a different port, there is no workaround.  You'd need to move your web service to your hosting account.