Security Warnings

Security warnings come from your browser, operating system, or antivirus software when they detect a potential threat. Unlike scam popups, these are legitimate alerts from trusted software you installed.

Anyone who uses a computer or phone sees security warnings. They are common when visiting sites with expired certificates, downloading files from unfamiliar sources, or when antivirus software flags suspicious activity.

These warnings exist to protect you. They indicate real risks like expired SSL certificates, known-malicious websites flagged by Safe Browsing databases, detected malware on your system, or unauthorized login attempts on your accounts.

Most Common in This Category

Connection Not Private – The site’s SSL certificate has expired, is self-signed, or does not match the domain.
Deceptive Site Warning – Google Safe Browsing has flagged this site for phishing or malware distribution.
Windows Defender Alert – Windows detected a file or program matching known malware signatures.
Ransomware Lock Screen – Malware has locked your screen; do not pay—follow removal steps instead.
Suspicious Sign-in Blocked – Google blocked a login from an unrecognized device or location.

How to Recognize Legitimate Security Warnings

Warnings from your installed antivirus software
Browser address bar showing "Not Secure"
Operating system security notifications
Email provider warnings about suspicious messages

Legitimate security warnings come from trusted sources like your OS, browser, or antivirus. They provide specific details without demanding immediate payment or phone calls.

Quick Troubleshooting Checklist

Verify the warning source: legitimate warnings come from your installed browser, OS, or antivirus—not from a website popup.
For certificate errors, check the site URL carefully for typos or impersonation.
Run a full antivirus scan if Windows Defender or your AV software flagged something.
For blocked sign-ins, check your email for the security alert and review the sign-in attempt details.
Keep your browser and OS updated—security warnings improve with each update.

When to Escalate to Advanced Debugging

Seek professional help if your antivirus detects threats it cannot remove, if you suspect your accounts have been compromised (change passwords from a different device immediately), or if you see persistent security warnings across multiple sites that are not normally flagged.