Can't access personal web site

A few years ago, when Cox eliminated personal website hosting, I moved my small site to a free hosting service atspace.  I have been able to access it until about a week ago when I started getting timeouts.  I can ping the site so I am getting dns resolution.  If I run through an external proxy server  it works fine but as soon as I try to access it directly via Cox HSI I get the timeouts.  Also, I can access it via Verizon 4G but when I connect  my cell phone to Cox via wifi I get the same timeouts.  So this happens on both my PC wired Ethernet into Cox and my smartphone.  The only common denominator is Cox HSI.  Could Cox be blocking http into atspace domains?  Is there a reason for blocking like a malware problem with this hosting service?