CertTools Logo
CertTools

TLS/HTTPS Troubleshooter

Diagnose TLS/HTTPS configuration issues and identify security problems

Enter a domain name to analyze its TLS/HTTPS configuration

Privacy Notice: Checks are performed server-side. Private IP addresses and local hostnames are blocked for security. Rate limited to 10 requests per minute.

What This Tool Checks

🔍DNS Resolution

Verifies A, AAAA, and CNAME records for your domain

🔐TLS Handshake

Tests TLS connection, protocol version, and cipher suite

📜Certificate Validation

Checks expiration, hostname match, key strength, and signature algorithm

🔄HTTP/HTTPS Redirects

Analyzes redirect chain and verifies proper HTTP to HTTPS upgrade

🛡️Security Headers

Validates HSTS, CSP, X-Frame-Options, and other security headers

⚠️Common Issues

Detects weak protocols, expired certificates, and misconfigurations