SSL Certificate Checker - Verify HTTPS, Chain & Expiry Online
Inspect SSL/TLS certificate validity for any domain. Analyze certificate chain (Root, Intermediate, Leaf), check expiration countdown, SANs, cipher suites, TLS 1.3 support, and detect hostname mismatch.
Chi tiết chứng chỉ máy chủ (Server Certificate)
Website vừa được kiểm tra SSL gần đây
20What is SSL/TLS Certificate Verification?
iTools SSL Certificate Checker is a deep-inspection cryptographic diagnostic tool engineered for DevOps engineers, webmasters, security analysts, and IT administrators. In modern web infrastructure, an expired, misconfigured, or untrusted SSL/TLS certificate immediately triggers disruptive browser warning screens (such as Google Chrome's "Your connection is not private - NET::ERR_CERT_DATE_INVALID"), cratering user trust, SEO rankings, and revenue.
Our diagnostic engine establishes an authentic cryptographic TLS handshake directly with your web server's port 443, retrieving the raw X.509 certificate stream to evaluate trust chains, protocol negotiation, cipher strength, and expiration countdowns in real time.
Key Diagnostic Metrics Evaluated by iTools
- End-to-End Certificate Chain Verification: Validates the complete trust path from the server's Leaf Certificate through all Intermediate Certificate Authorities (CA) to the pre-installed Root CA trust anchor.
- Precise Expiration Countdown: Calculates the exact remaining validity duration in days, hours, and minutes, paired with a visual health progress bar to prevent accidental expirations.
- Hostname & SANs Wildcard Matching: Inspects all Subject Alternative Names (SANs) to verify whether subdomains (e.g.,
api.example.com,staging.example.com, or*.example.com) are legitimately covered. - Cryptographic Algorithm & Key Strength: Detects public key types (RSA 2048/4096-bit vs modern ECDSA P-256/P-384), signature hash algorithms (SHA-256), and flags obsolete cryptographic algorithms (such as MD5 or SHA-1).
- Protocol Negotiation & Cipher Suite Audit: Verifies support for modern TLS 1.3 and TLS 1.2 protocols while flagging insecure legacy fallbacks (SSLv3, TLS 1.0, TLS 1.1).
- Revocation Status & OCSP Stapling: Evaluates Online Certificate Status Protocol (OCSP) stapling support to ensure maximum client connection speed and security.
Common SSL Errors Diagnosed & Resolved
| Error Code / Symptom | Root Cause | Corrective Remediation |
|---|---|---|
| ERR_CERT_COMMON_NAME_INVALID | Hostname mismatch | Ensure the accessed domain is explicitly listed in Subject Alternative Names (SANs). |
| ERR_CERT_DATE_INVALID | Certificate expired or clock desync | Renew via Let's Encrypt / Certbot, or purchase updated enterprise certificates. |
| ERR_CERT_AUTHORITY_INVALID | Missing Intermediate CA bundle | Concatenate intermediate certificates into fullchain.pem on Nginx/Apache. |
| SSL_ERROR_NO_CYPHER_OVERLAP | Incompatible cipher suite | Enable modern forward-secret ciphers (ECDHE-ECDSA-AES128-GCM-SHA256). |
Automated 30-Day Periodic Auditing & Instant Recheck
iTools automatically schedules background health checks on analyzed hostnames every 30 days to detect upcoming expiration dates. Whenever you deploy a new certificate or update Cloudflare Edge rules, click the "Recheck" button to bypass caching and force a live handshake instantly.
Mời đội ngũ iTools một ly cà phê ☕
iTools là nền tảng trực tuyến hoàn toàn miễn phí và không giới hạn. Nếu công cụ SSL Certificate Checker - Verify HTTPS, Chain & Expiry Online giúp ích cho công việc của bạn, một ly cà phê nhỏ sẽ là nguồn động viên to lớn để chúng tôi tiếp tục duy trì máy chủ tốc độ cao và phát triển thêm nhiều tiện ích mới!
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