TLS Configuration Checker
Check a domain's TLS 1.2 and TLS 1.3 support and current encrypted connection details.
Check Results
- TLS 1.3
- TLS 1.2
- Preferred connection protocol
- Cipher
- Certificate expiration
These results show TLS 1.2 and TLS 1.3 support at the time of the check. They do not replace a full security audit.
What Does the TLS Configuration Checker Test?
The checker tests whether a web server supports TLS 1.2 and TLS 1.3 for secure communication with modern browsers. It also shows the protocol, cipher, and certificate expiration from a successful connection.
Reading protocol and certificate details
TLS 1.3 is the modern default where supported, while TLS 1.2 remains important for broad compatibility. A successful handshake also exposes the negotiated cipher and certificate dates, which describe that connection rather than every configuration the server might allow.
Scope of the server-side check
Utilook connects from its server to the public domain on port 443. A CDN edge or geographic policy can produce a different certificate or protocol elsewhere. The result is not a vulnerability scan and does not inspect application code, every cipher, or every trust path.
Frequently Asked Questions
Should a site support both TLS 1.2 and TLS 1.3?
TLS 1.3 provides modern security and performance, while TLS 1.2 maintains broad compatibility. Public web services commonly support both versions.
Does this tool test TLS 1.0 and TLS 1.1?
No. TLS 1.0 and TLS 1.1 are obsolete and are not recommended for secure modern configurations, so this tool tests only TLS 1.2 and TLS 1.3.
Does the result represent the site's complete security status?
No. This tool checks protocol support and current connection details. It does not analyze every cipher or web application vulnerability.