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ERR_SSL_VERSION_OR_CIPHER_MISMATCH: Why It Happens and How to Fix It




How to Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error When Downloading Files




Have you ever encountered an error message that says ERR_SSL_VERSION_OR_CIPHER_MISMATCH when trying to download files from a website? If yes, then you are not alone. This is a common problem that many internet users face when they visit websites that have SSL/TLS issues.


SSL/TLS is a protocol that secures the communication between your web browser and the web server. It ensures that your data is encrypted and authenticated. However, sometimes your web browser and the web server may fail to agree on a common SSL/TLS version or cipher suite, which results in an error message.




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In this article, we will explain what causes this error and how to fix it. We will also provide some tips on how to prevent this error from happening again in the future.


What Is ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error?




The ERR_SSL_VERSION_OR_CIPHER_MISMATCH error is a type of SSL error that occurs when your web browser and the web server cannot support a common SSL/TLS version or cipher suite during the TLS handshake.


The TLS handshake is a process that happens every time you connect to a website that uses SSL/TLS. It is a way for your web browser and the web server to verify each other's identity and agree on a set of parameters for secure communication.


A cipher suite is a combination of encryption algorithms that are used to encrypt and decrypt your data. A SSL/TLS version is a specific standard of implementing SSL/TLS protocol.


If your web browser and the web server do not have a common SSL/TLS version or cipher suite, they cannot establish a secure connection. This triggers an error message that prevents you from accessing or downloading files from the website.


What Causes ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error?




There are several reasons why your web browser and the web server may fail to support a common SSL /TLS version or cipher suite. Here are some of the most common causes:


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Invalid SSL Certificates




One of the possible causes of this error is that the website you are trying to visit has an invalid SSL certificate. An SSL certificate is a digital document that proves the identity and authenticity of a website. It also contains information about the SSL/TLS version and cipher suite that the website supports.


If the SSL certificate is expired, revoked, self-signed, or issued by an untrusted authority, your web browser will not trust it and will reject the connection. This can cause the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error to appear.


Old TLS Versions




Another possible cause of this error is that the website you are trying to visit is using an old TLS version that is no longer supported by your web browser. TLS versions are constantly updated to improve security and performance. However, some websites may not update their SSL/TLS configuration to match the latest standards.


For example, TLS 1.0 and TLS 1.1 are considered obsolete and insecure by most modern web browsers. They have been deprecated and disabled by default in many web browsers since 2020. If you try to visit a website that still uses these old TLS versions, you may encounter the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.


Outdated Web Browsers or Operating Systems




Conversely, another possible cause of this error is that your web browser or operating system is outdated and does not support the latest TLS version or cipher suite that the website uses. As mentioned earlier, TLS versions are constantly updated to improve security and performance. However, some web browsers or operating systems may not update their SSL/TLS configuration to match the latest standards.


For example, TLS 1.3 is the newest and most secure TLS version available as of 2021. It offers faster and more robust encryption than previous versions. However, not all web browsers or operating systems support TLS 1.3 yet. If you try to visit a website that uses TLS 1.3, you may encounter the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.


QUIC Protocol




QUIC (Quick UDP Internet Connections) is a new protocol that aims to improve the speed and security of web traffic. It is based on UDP (User Datagram Protocol) instead of TCP (Transmission Control Protocol), which is the traditional protocol for web communication. QUIC also integrates SSL/TLS encryption into its protocol, which eliminates the need for a separate TLS handshake.


However, QUIC is still an experimental protocol that is not widely adopted by all websites or web browsers. Some websites may use QUIC as an alternative to SSL/TLS, while some web browsers may not support QUIC at all. This can cause compatibility issues and lead to the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.


Web Browser's Cache




The last possible cause of this error is that your web browser's cache is corrupted or outdated. Your web browser's cache is a temporary storage space where your web browser saves some data from the websites you visit. This can help your web browser load websites faster and reduce bandwidth usage.


However, sometimes your web browser's cache may store incorrect or outdated information about a website's SSL/TLS configuration. This can cause your web browser to use an incompatible SSL/TLS version or cipher suite when trying to connect to the website. This can trigger the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.


How to Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error?




Now that you know what causes this error, let's look at some methods on how to fix it. Here are six methods that you can try:


Method 1: Clearing the SSL State




The first method that you can try is clearing the SSL state of your web browser. The SSL state is a feature that allows your web browser to remember some information about the SSL/TLS configuration of the websites you visit. This can help your web browser establish secure connections faster and avoid unnecessary TLS handshakes.


However, sometimes clearing the SSL state can also help resolve some SSL errors, such as ERR_SSL_VERSION_OR_CIPHER_MISMATCH. Clearing the SSL state can force your web browser to refresh its information about a website's SSL/TLS configuration and use a compatible SSL/TLS version or cipher suite.


To clear the SSL state of your web browser, follow these steps:


  • Open your web browser and go to the settings menu.



  • Click on the advanced settings option and look for the network section.



  • Click on the button that says "Clear SSL state" or "Reset SSL state".



  • Restart your web browser and try to visit the website again.



This method may vary depending on the type and version of your web browser. You can also refer to this [guide] for more details on how to clear the SSL state of different web browsers.


Method 2: Enabling TLS 1.3




The second method


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