Can not connect to Symantec.com

I nan not connect to any Symantec web site or URL using one of my computers. That computer can connect to other web sites.

 

I can connect to Symantec web sites using my other computer.

 

Anyone know why that one computer cannot connect? 

 

I was trying to download a virus definition file from Symantec. That does not work on that first computer. Neither does chat.symantic.com.