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Certificate and TLS inspection

SSL Checker

Inspect the certificate issuer, subject, SAN names, expiration, hostname matching, chain summary, and visible TLS protocol support from Russia and Finland.

Use this page when HTTPS trust or certificate lifecycle is the problem, or when the website report points to a TLS-specific warning.

Website & SSL

Free public tool. No account required.

Summary

SSL checks run from Russia and Finland so you can spot certificate, trust, or edge differences by location.

Certificate identity

Subject, issuer, SAN domains, and hostname matching help answer whether the certificate was minted for the host you actually requested.

Expiration posture

Valid-from, valid-to, and days remaining show whether the certificate is already expired or close enough to deserve attention.

Negotiated protocol support

The server performs active TLS version probes and reports which protocol versions responded instead of guessing from headers.

Domain or host

SSL Checker

Ready

Paste a domain, hostname, or URL. The checker connects to the public target on port 443 unless you specify a different port.

SSL checks run from Russia and Finland so you can spot certificate, trust, or edge differences by location.

Examples

Report

Ready

Summary

Server-side diagnostic report

Report appears here

Run a check to generate a structured report with status, timings, technical details, and raw output where available.

SummaryAppears after the check finishes.
CertificateAppears after the check finishes.
Protocol supportAppears after the check finishes.

01

What this tool checks

Certificate identity

Subject, issuer, SAN domains, and hostname matching help answer whether the certificate was minted for the host you actually requested.

Expiration posture

Valid-from, valid-to, and days remaining show whether the certificate is already expired or close enough to deserve attention.

Negotiated protocol support

The server performs active TLS version probes and reports which protocol versions responded instead of guessing from headers.

02

How to use it

01

Start with the hostname you care about, not a random edge IP, so hostname matching stays meaningful.

02

Read the warnings before the chain summary because expiration, self-signed posture, and mismatches are usually the root problem.

03

If the certificate looks fine but the site still fails, open the website checker or port checker next.

03

How to read the result

Self-signed is not the same as expired

A self-signed certificate can still be fresh, but most browsers and crawlers will not trust it by default.

Hostname mismatch is precise

If the requested hostname is not covered by the SAN list or certificate CN, browsers will still block the page even if the port speaks HTTPS.

Protocol visibility is bounded

The report only lists the protocol probes the server actually attempted. It does not invent cipher support or grade the endpoint beyond what was checked.

Guides that help you get more from this tool

Interpret the output, understand common failure modes, and choose the next diagnostic step without leaving the product.

TLS and certificate trustSSL errors explainedUnderstand the SSL and TLS problems that usually appear in diagnostics, including expired certificates, hostname mismatch, self-signed chains, protocol issues, and what each failure means for real users.Result interpretationHow to read website check resultsLearn how to interpret website check output in the right order, including status, redirect chain, timings, headers, resolved IPs, warnings, and the difference between an application problem and a network failure.Downtime workflowHow to check if a website is downUse a clean workflow to tell the difference between a real website outage, a DNS issue, an SSL failure, a closed port, or a response that is technically online but still broken.Failure patternsCommon website availability problems explainedLearn the common layers behind website availability incidents, from DNS mistakes and SSL trust failures to closed ports, overloaded applications, and route-specific problems.
Browse all guides

SSL Checker FAQ

What counts as a certificate warning here?

Expiration, self-signed posture, hostname mismatch, and visible legacy TLS support all surface as warnings or errors depending on severity.

Does this replace browser testing?

No. It is a server-side view that helps you narrow the issue quickly, but browsers can still differ because of trust stores, HSTS, or policy settings.

Why is chain summary useful?

It helps you see whether the leaf was issued by the CA you expected and whether the presented chain looks coherent before you dig deeper.

Related tools

Website & SSLWebsite CheckerRun a full website report with one combined verdict plus Russia and Finland results for DNS timing, TCP connect time, TLS handshake time, TTFB, redirect chain, final URL, response headers, and resolved IP addresses.Domain & IP DataDomain InfoLook up registrar data, creation date, update date, expiration, domain status values, nameservers, and raw RDAP output when the registry supports it.Domain & IP DataDomain Age CheckerFocus on domain creation date, age in days, expiration, update timing, and renewal posture without the extra registry detail of the full RDAP page.Network PathPort CheckerTest whether a public TCP port is open, refused, timed out, or otherwise unreachable from Russia and Finland, with explicit latency and attempt details.