Norton DNS was not connecting to this FCC and several other FCC websites

Norton DNS woas not connecting to this FCC and several other FCC websites. 

 

http://fjallfoss.fcc.gov/ecfs/comment/view?id=6016876526

 

http://fjallfoss.fcc.gov/ecfs/

 

http://gullfoss2.fcc.gov/ecfs/Upload/

 

When I swithced back to comcast DNS I was able to access these sites.