port checker

With SSL Checker tool you can verify the installation of SSL certificate on your website. You will receive information about which SSL certificate is installed, who issued the SSL certificate, certificate validity period and other technical details. To start checking, enter the domain name in the field below

What is a SSL certificate?

An SSL certificate is needed to protect user data and identify the server on the network. This is an electronic document that contains information about the owner of the domain - name, domain name, address, legal data (if the organization owns the domain).

ssl certificate check

Sites without an SSL certificate transfer data using the open HTTP protocol. This means that any person who has intercepted the information will be able to use it for their own purposes - to steal a mail account or withdraw money from a bank card, knowing the CV-key.

With an SSL certificate, data is encrypted and transferred over secure HTTPS protocol. Even if the attackers intercept such information, they will not be able to decrypt it without a secret key known only to the domain owner.

How to know if the connection is safe?

The browser verifies the authenticity of the certificate before establishing a connection to the site. If the check was successful - users see in the address bar a green lock and the inscription “reliable”.

Sites with input forms that are not protected by an SSL certificate are marked unreliable in Google Chrome.

In their blog, Google developers wrote that in 2017 they would mark all sites without SSL certificates as unreliable. Connect to HTTPS now by installing an SSL certificate from a trusted certification authority on the site.

What is SSL and what is TLS?

SSL - Secure Socket Layer, the level of secure sockets. TLS - Transport Layer Security, transport layer security. SSL is an earlier system, TLS appeared later and it is based on the SSL 3.0 specification developed by Netscape Communications. However, the task of these protocols is the same - to provide secure data transfer between two computers on the Internet. This transmission is used for various sites, for e-mail, for messaging and a lot more for what. In principle, you can transmit any information in this way, about this below.

Secure transmission is provided through authentication and encryption of the transmitted information. In fact, these protocols, TLS and SSL, work in the same way, there are no fundamental differences. TLS can be said to be the successor to SSL, although they can be used simultaneously, even on the same server. Such support is necessary in order to provide work both with new clients (devices and browsers) and with obsolete ones that TLS do not support.

How to choose a suitable SSL certificate?

Certificates are divided into 3 types by level of verification. Each of them has its own visual features. Visitors see them on the site and decide how much he can be trusted.

SSL certificates with domain validation (Domain Validation, DV)

Include entry level verification:

  • confirm ownership of the domain
  • provide secure data transmission over a secure HTTPS connection

SSL certificates with organization verification (OV or Organization Validation)

Assume verification of information about the company in the online directory and on the state resource:

  • prove the legal and physical existence of the organization
  • confirm ownership of the domain
  • provide secure data transmission over a secure HTTPS connection


SSL certificates with extended validation (EV or Extended Validation)
Suggest to check the legal, physical and operating activities of the company.

  • prove the existence of the organization and the legality of its activities
  • confirm ownership of the domain
  • provide secure data transmission over a secure HTTPS connection

For additional security, install an SSL certificate with SGC option

If visitors to your site use outdated browsers, a regular certificate will not protect the transmitted data. Such browsers only support unsafe 40-bit encryption. A certificate with the SGC option forcibly increases encryption to secure 128/256-bit.

It is necessary to take: large online stores, postal and payment services, B2B resources, to all who care about the reputation and safety of each client Especially true if visitors to your site - budget organizations - they often use outdated hardware.

What is a root certificate?

Comodo, Thawte, Symantec, GeotTrust and RapidSSL root certificates are installed in all popular browsers. Browsers trust these centers and all certificates issued by them.

If the root certificate of the center is not installed in the browser, it will be recognized as invalid. This also applies to self-signed certificates. Visitors to these resources see a warning.

In some cases, the final certificate is issued not by the main center, but by the mediator. A trust chain is created : the root certificate is signed intermediate, the intermediate certificate is signed by the site.

Buying an SSL certificate, the site owner receives all intermediate certificates. Each of them must be installed on the server. When connecting to the server, the visitor's browser will receive information about the certificate chain. Verify that each of them is signed by the previous one. Comes to the root certificate and realizes that the site is reliable.

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