Website security warnings can be alarming for both website owners and visitors. However, not every security warning indicates that a website is infected or compromised. Sometimes, antivirus software may incorrectly identify a legitimate website as suspicious, resulting in a false positive detection.

A common scenario occurs when a website opens normally for hundreds of users but fails on a specific customer's computer with messages such as:

• Suspicious Website Blocked
• Browsing Protection Warning
• ERR_SSL_PROTOCOL_ERROR
• This site can't provide a secure connection
• Invalid SSL Response

This article explains how to diagnose and resolve such issues when using Quick Heal Total Security, especially when the website itself is functioning correctly.

Understanding the Problem

Consider the following situation:

• Website: https://bison.co.in
• Hosting Platform: Hostinger
• Technology: PHP 8.2
• SSL Certificate Installed
• Website Opens Normally for Most Visitors
• Only One Customer Experiences Blocking
• Customer Uses Quick Heal Total Security

Quick Heal displays:

Suspicious Website Blocked
Browsing Protection
Website - https://bison.co.in

After bypassing the warning, Chrome displays:

ERR_SSL_PROTOCOL_ERROR
This site can't provide a secure connection

Initial Verification

Before blaming the website, verify that the server is functioning correctly.

Run:

curl -Iv https://bison.co.in

Sample Output:

HTTP/1.1 200 OK
Server: LiteSpeed
X-Powered-By: PHP/8.2.30

This confirms:

✓ DNS Resolution Working

✓ SSL Handshake Successful

✓ Web Server Reachable

✓ PHP Application Running

✓ HTTPS Service Operational

If the website returns HTTP 200 OK, the server is functioning properly.

Common Causes

1. False Positive Detection

The most common cause.

Quick Heal's cloud reputation database may incorrectly classify a website as suspicious.

Symptoms:

• Website blocked on only one or a few systems.
• Website opens normally elsewhere.
• No malware detected on server.

2. Corrupted Quick Heal Web Protection Module

Quick Heal intercepts HTTPS traffic for inspection.

If its certificate or inspection engine becomes corrupted:

• SSL connections fail.
• Browsers show protocol errors.
• Legitimate websites become inaccessible.

3. Outdated Quick Heal Signatures

Older virus definitions may contain incorrect website reputation data.

Updating Quick Heal often resolves the issue.

4. Damaged SSL Cache

Windows stores SSL session information.

Corrupted SSL cache can trigger:

ERR_SSL_PROTOCOL_ERROR

5. Browser Corruption

Corrupted browser profiles, certificates, or extensions can interfere with HTTPS connections.

6. DNS Cache Issues

Old DNS records may direct traffic incorrectly.

Step-by-Step Troubleshooting

Step 1 – Verify SSL Certificate

Use online SSL testing tools.

Check:

• Certificate Expiry
• Certificate Chain
• TLS Version Support
• Intermediate Certificates

A properly configured website should receive an A or A+ SSL rating.

Step 2 – Update Quick Heal

Open:

Quick Heal Total Security
→ Update Now

Install all updates.

Restart the computer.

Test the website again.

Step 3 – Clear Windows DNS Cache

Open Command Prompt as Administrator.

Run:

ipconfig /flushdns

Expected Result:

Successfully flushed the DNS Resolver Cache

Step 4 – Reset Winsock

Run:

netsh winsock reset

Then restart Windows.

Step 5 – Reset TCP/IP Stack

Run:

netsh int ip reset

Restart the system.

Step 6 – Clear SSL State

Open:

inetcpl.cpl

Navigate:

Content Tab
→ Clear SSL State

Restart Chrome or Edge.

Step 7 – Test in Incognito Mode

Chrome:

chrome.exe --incognito

Edge:

msedge.exe --inprivate

If the website opens:

• Browser extension problem
• Corrupted user profile

Step 8 – Check Hosts File

Open:

notepad C:\Windows\System32\drivers\etc\hosts

Ensure there are no entries such as:

127.0.0.1 bison.co.in
0.0.0.0 bison.co.in

Remove any suspicious entries.

Step 9 – Disable HTTPS Scanning

In Quick Heal:

Internet & Network Protection
→ Browsing Protection
→ HTTPS Scanning

Temporarily disable.

Visit:

https://bison.co.in

If the website opens:

The issue is confirmed within Quick Heal's HTTPS inspection engine.

Step 10 – Add Website to Trusted List

Open:

Quick Heal
→ Settings
→ Browsing Protection
→ Trusted Websites

Add:

https://bison.co.in
http://bison.co.in
https://www.bison.co.in

Also add subdomains:

https://restoreoutlook.bison.co.in
https://support.bison.co.in

Verify Server Health

Website owners should verify:

DNS

nslookup bison.co.in

SSL

curl -Iv https://bison.co.in

HTTP Response

curl -I https://bison.co.in

Expected:

HTTP/1.1 200 OK

Why ERR_SSL_PROTOCOL_ERROR Appears

This error usually indicates:

• SSL interception failure
• Antivirus HTTPS scanning issue
• Corrupted root certificate
• TLS negotiation failure

Since your server successfully completes TLS negotiation, the issue is likely on the client side.

Reporting False Positives to Quick Heal

If the website is clean:

Submit a false positive report to Quick Heal.

Include:

• Website URL
• Screenshot of blocking message
• Screenshot of SSL test results
• Confirmation that other customers can access the website

Quick Heal usually reviews and removes false detections after verification.

Best Practices for Website Owners

Maintain SSL Certificates

Renew before expiry.

Use HTTPS Only

Redirect all HTTP traffic to HTTPS.

Enable HSTS

Improve browser trust.

Keep PHP Updated

Use supported PHP versions.

Monitor Reputation

Regularly scan with:

• Google Safe Browsing
• VirusTotal
• SSL Labs

Keep Hosting Secure

Maintain:

• Updated CMS
• Updated Plugins
• Updated Themes
• Strong Passwords

Conclusion

When a website opens correctly for most users but is blocked on a single customer's computer, the problem is usually not the website itself. Antivirus web filtering, corrupted SSL inspection certificates, browser issues, or local network configuration are more likely causes.

In the case of bison.co.in, successful HTTPS communication, valid server responses, and normal operation for other users strongly indicate that the customer's Quick Heal installation or local system configuration is responsible for the blocking behavior. Following the troubleshooting steps in this guide can quickly identify and resolve the issue.