Web sites often block VPN access for legal or copyright reasons. There is nothing a VPN provider can do to get around these blocks.
Contact the individual web sites to see if they block VPN access. Many sites do this for legal/copyright reasons.
A VPN service does not block access to any sites. There is no white/black lists for sites.
Web sites have the right to protect their content. And sometimes there are legal reasons for blocking access to users from a different geographic location.
Some VPN providers may have found ways to circumvent these legal protections. But Norton is not here to bypass legal protection. If you are one that wants to access this kind of legally protected content, then maybe you would be better served with another product. (credit peterweb)
Many web sites do not allow access from known VPN IP addresses. They do this for copyright, legal, and political reasons. There is nothing a VPN provider can or should do to circumvent these legal protections.
So if you are using the VPN feature in 360, this could be what you are seeing.
If the sites work without the VPN, try contacting the Support department for that/those sites to see if they have any work around for VPN users. (credit peterweb)