We are one of the websites that is being blocked by COMCAST so they can ask $50 fee for deb locking their account! So idf you miss a lot of pages and get an error in google "this page does not exist" you know now why. It is not the websites but COMCAST that is blocking you!Here are some instructions how to solve the problem:
The issues seems to be related to DNS resolution with both Comcast and Google. The Comcast DNS server is failing to resolve your domain name so there is never an IP assigned. Google is having the same issue.
Step #1 - I'm using Windows 8 so this will be different for different versions of Windows.
Bring up the control panel in Windows - it's location is different for each version of windows - Google the location if you can't find it - usually it's in the start menu.
Choose the network and Sharing option
Find the network you are connected to and click or right click to bring up a list of properties. This is called Status.
Click on properties on the lower left.
Find Internet Protocol Version 4 TCP/IP 4 in the list
Under choose Use the following DNS Server addresses
These are OpenDNS addresses.
This can also be done at a router level.