“URL:Blacklist”
Avast / AVG Web Shield
The requested URL is classified by the product’s web reputation layer. The label does not identify the infection or prove that a current scan is clean.
Open the vendor record →Warning-first troubleshooting
Website security warning messages explained
Match the message visitors see to the system that produced it, then decide whether the next step is malware cleanup, a reputation review, or a category reclassification.
Find a warningMessage glossary
What the warning tells you, and what it does not
Similar red screens can come from different datasets. Never submit the same generic request everywhere; identify the owner first.
“Deceptive site ahead”
Google Safe Browsing
Google detected phishing, social engineering, harmful downloads, or compromised content on a URL associated with the site.
Open the vendor record →“This site has been reported as unsafe”
Microsoft Defender SmartScreen
Microsoft reputation data classifies the page as phishing, malicious, or otherwise unsafe in Edge or Windows.
Open the vendor record →“Malicious Web Site Blocked”
Norton Safe Web
Norton has applied a dangerous-site verdict to the URL or domain. Check the Safe Web report before requesting reevaluation.
Open the vendor record →“Website blocked due to phishing”
ESET Anti-Phishing
The page matches ESET phishing intelligence or behavior. Confirm the precise URL and whether it is genuinely compromised before reporting a false positive.
Open the vendor record →“Suspicious web page detected”
Bitdefender
Bitdefender Web Protection or TrafficLight considers the page suspicious. The vendor’s official false-positive route owns the review.
Open the vendor record →“Web Page Blocked”
FortiGuard Web Filter
A FortiGate policy blocked the site because of its FortiGuard category, rating, or local administrator policy.
Open the vendor record →“Not allowed to browse this site”
Zscaler
A corporate Zscaler policy rejected the site’s category or risk. A site review may be needed, but the organization’s own policy can also be the cause.
Open the vendor record →“Newly registered / unrated domain”
Enterprise web filters
The domain may be clean but too new or uncategorized for a company’s policy. This is a classification problem, not necessarily a malware blacklist.
Open the vendor record →“Malicious (one security vendor)”
VirusTotal contributor result
VirusTotal is displaying a contributor’s verdict. The named contributor, not VirusTotal, must investigate and change its own classification.
Open the vendor record →Decision guide
Cleanup, false-positive review, or reclassification?
Clean up first when evidence is active
Unexpected redirects, injected pages, modified files, unknown administrators, malicious downloads, search spam or repeated reinfection require investigation and cleanup before review.
Request review after verification
When the relevant URL is clean, the cause has been removed, and external behavior is stable, use the official vendor route with concise evidence.
Request categorization when the block is policy-based
New, unrated, or incorrectly categorized domains may be blocked by corporate policy without a malware verdict. Use the web-filter classification workflow.
Start with evidence
Need help identifying the warning?
Send the full warning text, vendor or product name, affected URL, and what changed before the warning appeared.