Class page can't be accessed by students

Hi - I'm trying to figure out why I can access my page at home but not school. Chrome books and student homes. Worked 2 weeks ago. http://herookthirdgrade.altervista.org
Updated the page at home today, and see changes....student at home can't. It says: took too long to load connection timed out
Any guidance appreciated

You site is online without problems.
Probably your site is blocked by your ISP. Are you using comcast?

Bye!