SSL Checker: Inspect a TLS Certificate

Enter the exact public hostname used by visitors. A parent domain and a subdomain can present different certificates, even when they lead to related services. Use the hostname rather than replacing it with an IP, because name-based TLS configuration can affect which certificate the server presents.

Choose a remote region, consent to the public measurement and run the SSL checker. The request uses HTTPS on the root path. The result identifies the actual probe and time, which matters when a content-delivery service or load balancer is distributing traffic across several endpoints.

Read validity dates and the trust result separately. A certificate can be within its date range but fail another trust condition. Conversely, a missing certificate object means this measurement did not provide the details; it should not be displayed as a valid certificate with a made-up expiry date.

Compare the subject and issuer with your deployment records, then inspect the raw result when the observation differs from expectations. If you recently renewed a certificate, check the actual endpoint serving users rather than assuming that a successful issuance automatically updated every edge or origin.

SSL checker remains a common search phrase, although modern HTTPS connections use TLS. The certificate identifies a subject and is evaluated under the trust rules of the client making the request. Here that client is the remote probe, not every visitor’s browser. The tool displays the provider’s authorized flag and certificate dates without claiming to enumerate all alternative chains or supported algorithms. It can reveal an unexpected certificate or approaching expiry at the observed endpoint, but a full security assessment needs additional tests and a clear definition of the client population being supported.

A certificate that one probe accepts is not a guarantee that all older devices, enterprise trust stores or application clients will accept it. Their trust configuration and supported protocols may differ.

This SSL checker does not promise a complete chain inventory, revocation audit, cipher enumeration or security grade. Do not replace those missing capabilities with a green “secure” badge based only on a successful HTTP response.

Certificate renewal and deployment are separate events. Keep the returned certificate details and observation time when checking a rollout. A scheduled reminder can help you revisit the endpoint, but this page does not create one automatically.

Imagine a renewed certificate has been issued, but a remote observation still shows the previous expiration date. One possible reason is that the checked endpoint has not received the new deployment; another is that a different edge or hostname is being inspected. The observation alone does not decide between those explanations. Compare the hostname, returned subject, issuer and time with your deployment record. A successful issuance message is not evidence that every endpoint is serving the new certificate, so check the actual public route visitors use.

Keep the question, input, observation time and source together. A bare address, percentage or status code is difficult to interpret later because it omits the connection and measurement context. When comparing two observations, note what changed between them: the target, network, VPN state, selected adapter, record type or remote origin. Change one relevant condition at a time when possible. That makes the comparison easier to explain without inventing a cause from one number.

Save only information you actually need. Network records can reveal infrastructure names and connection details, even when they do not contain a password. Remove unrelated identifiers before sharing a screenshot with another person. Never put private credentials in a domain field or publish an internal hostname as part of a public test. A copied result is a snapshot, not a promise that the same conditions still apply when someone reads it later.

Kepo is a Mac desktop-widget product for repeated checks and small workflows. A labeled troubleshooting note or a supported monitoring widget can keep the relevant context accessible while you work. The download link opens the product workflow; this article does not automatically install a configured diagnostic widget, transfer your network inputs or start a scheduled check. Confirm the actual widget’s capabilities before relying on it for ongoing observations.