In the past few weeks this has happened several times to us.
We get access denied to this site, with a long reference number when visiting major sites like Delta.com, Ebay.Com....heck even xfinity.com has the problem. I am in IT and it appears that anyone using AKAMAI services we get this error message. Doing some digging for some reason the public IP address we have right now has been blacklisted a few places. No viruses or other things going on in our house. All sites work fine on cellphone hotspot.
Anyone been able to get comcast to change their Public IP. They aren't being very helpful.