# ERR_SSL_VERSION_OR_CIPHER_MISMATCH What is Error and How to Fix?

https://www.nettescil.com.tr/knowledgebase/article/err-ssl-version-or-cipher-mismatch-what-is-error-and-how-to-fix

**ERR_SSL_VERSION_OR_CIPHER_MISMATCH**on web browsers SSL (Secure Slot Layer) is an error message encountered when connections are not provided. This error is between your web browser and the server. SSL indicates that the connection is not correctly dried. Usually SSL/TLS It arises because protocols are not supported by incompatible or security protocols. In this article, we will examine the causes and solutions of this error in detail.

**ERR_SSL_VERSION_OR_CIPHER_MISMATCH Causes of Error**

1st**Applied SSL/TLS Protocol Dispute**

Server, old SSL or TLS can support protocols and your browser only with more secure protocols (for example, TLS 1.2 Or TLS 1.3) The connection is available. In this case, SSL The version of the numbness error occurs.

2. 2.**Use of old or weak encryption methods**

Instead of using the server, up-to-date and secure encryption algorithms, it may be using weak or old encryption methods. Browsers reject these old algorithms and blocks the connection.

3. .**Wrong Configuration on the server**

Your Server SSL configuration can not contain the correct certificate chain or appropriate protocols. Furthermore, it can lead to this error, which the web server is incorrectly structured.

4. .**Browser or Server Incompatible**

The protocol between the browser and the server can be incompatible. In this case, between the browser used and the server SSL/TLS The connection cannot be installed because the protocols are not compatible.

5. 5.**Certificate Issues**

SSL The certificate may have an invalid or incompatible format. The certificate errors may also cause such a incompatibleity.

**ERR_SSL_VERSION_OR_CIPHER_MISMATCH Error Solving Methods**

1st**SSL/TLS Update Protocol**

Your Server SSL/TLS to the most up-to-date version of the protocol, meaning TLS 1.2 Or TLS Update to 1.3 is necessary. Old protocols are not supported by modern browsers.

2. 2.**Remove Poor Encryption Methods**

Check encryption algorithms used on your server and remove old, weak encryption methods. AES, SHA-256 Using strong encryption algorithms like, it will increase the security of connections.

3. .**Check Server Configuration**

SSL make sure that the certificates are correctly configured. Also, the server is correct SSL Make sure that the certificate chain offers and switches are compatible.

4. .**Update Browser**

Using the current version of your browser ensures that security protocols are compatible. Browser updates are often compatible with new protocols.

5. 5.**SSL Refresh or Re-dry the Certificate**

SSL If there is a problem in your certificate, renew or re-install your certificate. It is necessary that the certificate is valid and is properly installed.

6. 6.**Check the Compatibility of the Web Server**

Web server (Apache, Nginx,etc.) SSL/TLS Make sure it is compatible. If there is any error in server configurations, this error should be resolved.

7. 7.**Clean Browser Cache**

Cache and cookies of your browser old SSL can keep connection information. Therefore, it can also be solution to clean the cache.

**ERR_SSL_VERSION_OR_CIPHER_MISMATCH Tips to Prevent Error**

•For your website **strong and current SSL Certificates** Use.

•**Home SSL/TLS protocols** completely disable and only secure versions (TLS 1.2 & TLS 1.3) Take care of the use.

•Your Lord SSL configuration **periodically review** and make sure it is compatible with current standards.

• To minimize server compatibility and server compatibility **security updates on the server side and browser** Follow.

**Conclusion**

ERR_SSL_VERSION_OR_CIPHER_MISMATCH error occurs when a secure connection between web browsers and servers is not installed. To solve this problem, SSL/TLS Update protocols and encryption algorithms is necessary to make the right server configurations and apply certificates. Thanks to these steps, it is necessary to update the protocols and encryption algorithms on your website. SSL You can remove errors and provide a secure connection for your users.