Connectivity Issues

I respect the district policy of blocking sites fro, students and sraff.  The intention is good.  I use videos to complement my teaching and because youtube is blocked in my district, I bring along my on wi-fi connection.  I was ready to go and wow my class with these wonderful data about the world wide web, when my network connection just can not be found.  Since I started school a while back I have never had any issues with connectivity.  sigh.  another stumbling block.