When testing scirra.com's SSL implementation (SSL Labs Report), we observe an interesting discrepancy: Chrome displays certificate warnings while Firefox and IE properly recognize the EV SSL. This typically indicates one of several potential configuration issues.

The most common culprits for Chrome-specific SSL validation failures include:

• Missing intermediate certificates in the chain
• SHA-1 signatures in the certificate chain
• Certificate Transparency (CT) log requirements not met
• Incorrect Subject Alternative Name (SAN) configurations

Here's how to verify your server's certificate chain completeness using OpenSSL:

openssl s_client -connect scirra.com:443 -showcerts

For Apache servers, ensure your configuration includes the full chain:

SSLCertificateFile /path/to/certificate.crt
SSLCertificateKeyFile /path/to/private.key
SSLCertificateChainFile /path/to/intermediate.crt

Modern Chrome versions enforce stricter requirements than other browsers. Key checks include:

// JavaScript snippet to detect certificate errors
window.addEventListener('load', function() {
  if (window.chrome && window.chrome.loadTimes) {
    const loadTimes = window.chrome.loadTimes();
    if (loadTimes && loadTimes.wasFetchedViaSpdy === false && 
        loadTimes.wasNpnNegotiated === false) {
      console.warn('Potential SSL handshake issues detected');
    }
  }
});

Chrome requires EV certificates to be logged in Certificate Transparency logs. Verify your CT compliance:

# Using crt.sh to check CT logs
curl -s "https://crt.sh/?q=scirra.com" | grep -i "certificate transparency"

For Nginx servers experiencing similar issues:

ssl_certificate /etc/ssl/certs/scirra_com.crt;
ssl_certificate_key /etc/ssl/private/scirra_com.key;
ssl_trusted_certificate /etc/ssl/certs/scirra_com.ca-bundle;

Remember to always restart your web server after making changes:

sudo systemctl restart nginx
# or for Apache
sudo systemctl restart apache2

When Chrome flags an Extended Validation (EV) SSL certificate as invalid while other browsers accept it, we're typically looking at one of these scenarios:

// Example: Checking certificate chain in Node.js
const https = require('https');
const options = {
  hostname: 'scirra.com',
  port: 443,
  method: 'GET',
  rejectUnauthorized: true // This would fail if Chrome rejects
};

const req = https.request(options, (res) => {
  console.log('statusCode:', res.statusCode);
});

req.on('error', (e) => {
  console.error('Certificate validation failed:', e);
});
req.end();

From the SSL Labs report, we can identify several potential technical culprits:

• Missing intermediate certificates in the chain
• Certificate Transparency (CT) log requirements not met
• SHA-1 signatures in the chain (deprecated in Chrome)
• OCSP stapling configuration issues

To inspect the certificate chain like Chrome does:

openssl s_client -connect scirra.com:443 -servername scirra.com -showcerts | openssl x509 -text -noout

Compare the output with Firefox's certificate viewer to spot discrepancies in the chain.

Recent Chrome versions enforce stricter rules for EV certificates:

# Example of checking CT logs via API
curl "https://ct.googleapis.com/logs/argon2020/ct/v1/get-entries?start=0&end=0"

The server configuration should include all intermediate certificates:

# Nginx example
ssl_certificate /path/to/fullchain.pem; # primary cert + intermediates
ssl_certificate_key /path/to/privkey.pem;
ssl_stapling on;
ssl_stapling_verify on;

After making changes, verify with these tools:

# Check certificate installation
openssl verify -CAfile /etc/ssl/certs/ca-certificates.crt /path/to/cert.pem

# Test OCSP stapling
openssl s_client -connect scirra.com:443 -status < /dev/null 2>&1 | grep -A 17 'OCSP response'