How to find out, diagnose, lookup with SSL / TLS certificate checker tools of a website or domain? Here is a solution
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How to check SSL / TLS certificate of Website or Domain in details here:

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For an explanation of SSL / TLS Certificate checker tools for a Website or Domain, please read the details below

What is SSL / TLS? SSL / TLS is one of the internet protocols that was created to provide security and keep internet connections more secure in communicating or transacting over the internet network, and protecting any important and confidential personal data such as usernames, passwords, PINs, credit card numbers, and others will be protected so that private data will be kept safe. This process is then sent between the two systems, namely the client and server, the data will be encrypted by the system in an application to prevent wiretapping and interference by criminals to modify or change the data it sends. SSL itself stands for (Secure Sockets Layer) and TLS stands for (Transport Layer Security) the same goal is to secure data because the data sent will be randomized by "Cipher" technology or "Encryption Algorithm" into the form of "Hex Code" so that the data always protected, secure and safe.

The difference between SSL and TLS is only in terms of version, the SSL version was first created by Netscape Communications from version 1.0 & version 2.0 around 1994 -1995 then continued with the last SSL version 3.0 around 1998, around 1999 the SSL name was then changed and named as TLS, while the latest version of TLS at that time started (version 1.0 in 1999), (version 1.1 in 2006), (version 1.2 in 2008) up to version TLS 1.3, this version of TLS 1.3 is the latest and was released around 2018. Until now the protocol using SSL is actually no longer used or with the term "deprecated" because from the level of security, there are still many weaknesses and works not optimally, over time the name of "SSL" was changed to the name "TLS" because of the TLS version already supports many "cipher suites" algorithms so that the level of security is more maximum than compared to the previous version, even though the new version is called TLS, but people generally still know the term SSL rather than mentioning names TLS because SSL names is a term that is more commonly used. So in conclusion, SSL and TLS are the same, only have different names.

SSL / TLS is generally used on website servers, email, and FTP. For example, if SSL / TLS has been installed on the website, you will see the words "https" at the beginning of the website URL address or if you visit a website, and it is found at the URL address beginning with the words "https" accompanied by a padlock key image that means SSL / TLS on the website is already installed, only sometimes people don't understand whether the address of a URL marked "https" is actually installed safely from leak bugs (VULNERABLE)? if there are a few bugs, 1 to 3 bugs may still be safe, but if there are a lot of bugs then the SSL or TLS function which should be safe is not to be optimal or (less secure) so that the SSL function is not optimal, of course, to find out and prevent this you must use SSL / TLS certificate check tools because to get a secure connection the website owner must have an official SSL certificate license (also known as "Digital Certificate") which must then be installed and must be optimally configured on the website server. To get an SSL certificate officially, you just need to buy a certificate from an organization or company that is issued by a certificate authority and is trusted to maintain and verify its identity data. Examples of the best SSL organizations/companies that issue official certificates include Symantec, GeoTrust, Thawte, Comodo, GlobalSign, DigiCert, RapidSSL, and many more, so with the lookup tools to check the SSL / TLS Website Certificate or better known as "Check SSL / TLS Certificate "will make it easier for you to check SSL or TLS.

By checking the SSL or TLS checker, it will be very effective to see and help you check the status of SSL certificates on a website or domain, whether the website has an SSL / TLS certificate installed or not? if you have installed SSL or TLS, has it been done correctly and safely from SSL bugs? this tool supports checking various versions starting from (SSL version 2.0, version 3.0) and (TLS version 1.0, 1.1, 1.2, up to version 1.3), by using these check tools you can see, know and diagnose SSL / TLS in full and in details, starting from the SSL or TLS version used, see information on the type of SSL / TLS certificate such as knowing the name of the Issuer or SSL / TLS Organization / Company, the name of the protocol used, the validity period of the certificate or certificate validity, Server key size, Signature algorithm, Common name (CN), Subject alt name (SAN), EV cert, Certificate Revocation list, Server Name Indication (SNI) and many more, and check whether the SSL / TLS certificate used is safe from bugs (VULNERABLE) or Vulnerabilities? You can check this in the "Testing Vulnerabilities" section after the checking process has been completed, also check the client handshake simulation to find out what type of OS (Operating System) and browser names support SSL / TLS, and find out how many SSL / TLS "Ciphers. "or" Encryption Algorithm "that is already installed, this tools will also make it easier for you to provide some tips on how to increase SSL security if a less than optimal configuration is found such as a bug or VULNERABLE on a website, and you can simply change the configuration manually on your website server. so that the results can be more optimal and safer, if you have made configuration changes on your server, please check again with this SSL check tool, and make these changes until you get the maximum safe configuration results or what you want. Please use the SSL test in this tool right now to check or test SSL / TLS on a website on the internet, whether it's yours or someone else's that will be directly tested from our server or this website online.

Below are 3 TIPS on how to increase website security by using an SSL / TLS Certificate :

1. We recommend that you buy an official license certificate to protect your private data. Examples of the best SSL companies that issue official certificates such as Symantec, GeoTrust, Thawte, Comodo, GlobalSign, DigiCert, RapidSSL and please visit the website.

2. Activate the TLS protocol at least version 1.0, version 1.1, version 1.2, for version TLS 1.3 it is better to activate it too, but generally, only a few websites have activated the TLS 1.3 feature because to activate this version you have to upgrade or install OpenSSL at least in version 1.1.1, also activate the "Cipher Suite Code" such as DHE, RSA, AES, GCM, ECDH, ECDSA, AESGCM CHACHA20, POLY1305 with SHA256 SHA384 to the maximum, and the SSL protocol should not need to be activated because it is outdated and deprecated.

3. Avoid too many "VULNERABLE" or "Vulnerabilities" bugs if there are a lot of bugs, just reduce it to 2 or 3 bugs in "VULNERABLE". The fix is ​​quite easy with one simple way, you simply activate the protocol (TLS 1.1 and 1.2) or (TLS 1.2 and 1.3) only, and don't forget to set the SSL configuration file and change the "SSL Protocol" and "Cipher Suite Code", if your webserver uses Apache, set the "SSLProtocol" and "SSLCipherSuite" sections, if your webserver uses Nginx, set it in the "ssl_protocols" and "ssl_ciphers" section, please analyze it yourself by setting the "SSL Protocol" and "Cipher Suite Code" which are suitable and precise, the results will be maximized and the SSL bug "VULNERABLE" will definitely be reduced, because this tool will check SSL bugs that are full of vulnerabilities and dangerous including bugs with the names Heartbleed, Ticketbleed, TLS FALLBACK SCSV, CCS, ROBOT, CRIME, BREACH, POODLE, SWEET32, FREAK, DROWN, BEAST, METAL, LUCKY13, RC4 and still many more, if it continues to be ignored, it is likely that your website is easy to attack or be tapped by criminals, so that the website server will not work optimally in terms of data security, immediately repair it manually and check again with this tools.

Hopefully, this information will be very useful to you.