What is TLS handshake? How to fix TLS handshake? – TWCN Tech News

TLS or Transport Layer Security is an encryption protocol. It is designed such that communication through TLS remains secure and private. In this post, I will explain what TLS handshake is and how to fix the TLS handshake if you face issues.

Before we go ahead and talk about the TLS handshake, lets understand when TLS occurs. Every time you access a website or application over HTTPS, TLS is used. When you access emails, messages, and even VOIP, it uses TLS. You should know that HTTPS is an implementation of TLS encryption.

A handshake is a form of negotiation between two ends. Just like when we meet people, we shake hands, and then go ahead with anything else. On similar lines, the TLS handshake is a form of acknowledgment between two servers.

During the TLS handshake, the servers verify each other and establish encryption, and also exchange keys. If everything is authentic, and as expected, more data exchange will take place. There are four major steps:

In laymans word, they first say hello, then the server offers a certificate that the client needs to verify. Once the verification is complete, a session is generated. A key is created through which data is exchanged through the session.

You cannot do anything if there is a server-side issue but you are having a problem with the browser, it can be fixed. For example, if the server offers a certificate that cannot be authenticated, then you cannot do anything about it. However, if the problem is a mismatch of the TLS protocol, then you can change it from the browser.

There are many more reasons why the TLS handshake can fail, and it depends on the scenario. So here some ways to fix TLS, but before that, always use these rules to filter out the problem.

It is the top reason why the TLS handshake has failed most of the time. The system time is used to test whether the certificate valid or expired. If there is a mismatch between the time on your computer and the server, it can make certificates look expired. Fix the time by setting it to automatic.

Now visit the website again, and check if has fixed the TLS handshake

There is one rule if its happening for one site, then its security software problem, but if its happening for all the websites, then its a system problem.

The security software or browser extension on your computer may be intercepting the TLS connections and changing something which results in problematic TSL handshake. It is also possible that a virus on the system is causing all the TLS problem.

Some browser extensions change proxy settings, and it may cause this problem.

In either case, you need to fix your computer or security software. The best way to further verify this is by using another computer and open the same website or application, which was causing the problem.

Windows 10 and earlier versions of Windows centralize the protocol settings in the system. If you need to change the TLS version, you can do it using Internet Properties.

While Chrome, IE, and Edge use Windows features, Firefox, like its certificate database, manages on its own. Here is how to change the TLS protocol in Firefox:

Every browser maintains a database for certificates. For example, every Firefox profile has a cert8.db file. If you delete that file, and a restart fixes it, then the issue is related to the local certificate database.

Similarly, in Windows, when using IE or Edge, the Certificate Manager is responsible, or you can go to the edge://settings/privacy and click onManage HTTPS/SSL certificates and settings. Delete certificates and try again

If you cannot find the database, delete the profile, and try again.

Its the last resort if you are having the issue with one of the browsers. You can choose to uninstall completely and then reinstall or reset the browser using the inbuilt feature. Follow the links to reset Chrome, Microsoft Edge, and Firefox.

Lastly, while you can browse a website even if the certificate is invalid, make sure not to perform any kind of a transaction with the website. Neither you should use a credit card, nor you should enter your account password.

We hope these tips were easy to follow, and you were able to resolve the TLS issue on your browser or your computer. I have tried my best to offer you enough solution, but honestly, TLS is extremely vast, and more solutions may be available.

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What is TLS handshake? How to fix TLS handshake? - TWCN Tech News