TLS protocol & cipher checker
Attempts a handshake forcing each protocol version. Important honesty note: this server's own OpenSSL build may refuse to even attempt legacy TLS 1.0/1.1 (increasingly common since OpenSSL 3.0's default security policy disables them client-side) — a "not supported" result there can reflect this server's restrictions rather than the target's.
What is TLS protocol & cipher checker?
Not every server supports every TLS version — some still allow the deprecated TLS 1.0/1.1 (a compliance and security concern), while others have moved entirely to TLS 1.2/1.3 — checking which are actually negotiable tells you where a server stands.
How to use it
Enter a hostname; the tool attempts a handshake forcing each protocol version in turn, plus reports the cipher a normal client connection would negotiate by default.