Norton is one voice in a choir. Chrome follows Google Safe Browsing, many office filters follow McAfee, and Sucuri's free scanner reads several lists at once. This is the whole map, on one page.
Site owners fix the Norton flag, celebrate - and then a Chrome user hits a red screen from Google. The lists are independent: different companies, different data, different review queues. If your visitors matter, you check all the raters that can block you, clear the ones that flag you, and keep the evidence in one place. Here they are, in the order most sites should work through them.
Chrome's red warning page, and the warnings in Firefox and Safari, come from Google Safe Browsing. Owners check their status in Google Search Console, under Security Issues; anyone can look a domain up on Google's Safe Browsing status page. Reviews are requested inside Search Console after a cleanup, with a description of what you fixed. For most websites this list reaches more visitors than all the others combined, so it is checked first.
Many company firewalls and McAfee's own WebAdvisor rate sites through TrustedSource. Look your domain up in the TrustedSource URL checker to see its category and reputation, and file a categorisation dispute there if either is wrong - McAfee responds by email, typically within a few business days. If your customers sit inside offices, this list can matter as much as Norton's.
Sucuri's free remote scanner checks your site for visible malware and reports its blacklist status across several sources in one result. That makes it the best first screen when a warning appears from an unknown product, and the best independent proof after a cleanup: one dated, clean SiteCheck result supports every dispute you file elsewhere.
Submit your URL to VirusTotal and dozens of security engines vote on it at once. Use it as evidence and as an early-warning system: if many engines flag you, something is genuinely wrong. But read it carefully - one obscure engine flagging you on VirusTotal is not the same as a public block, and it is the individual vendors' own lists that decide what visitors actually see.
The workflow that keeps this manageable:
When the next customer screenshot arrives, that note tells you in seconds which list you are dealing with.
The video covers the Symantec member of this family in detail. Watch it, then work the rest of the map on this page.
▶️ Watch Full VideoWhichever one your visitors' browsers and security products use. For most sites that is Google Safe Browsing first, then the antivirus your typical customer runs.
Dispute with that specific vendor, using the clean results from the others as evidence. Do not panic - but do not ignore it either if that vendor reaches your audience.
No. Every vendor keeps its own list and runs its own review. Anyone who tells you otherwise is selling something that does not exist.