https://support.symantec.com/en_US/advanced-threat-protection-network.64123.html
Sorry, we can't seem to find that page. The URL may have changed, expired or never existed in the first place. If you copied it or typed it in, double check that you entered what you wanted to.
Clever :-)
Platform support is here:
https://support.symantec.com/en_US/advanced-threat-protection-platform.html
Thanks