How to Fix Err_SSL_version_or_Cipher_Mismatch Error

How to Fix Err_SSL_version_or_Cipher_Mismatch Error

The error (Err_SSL_version_or_Cipher_Mismatch) is a web-based error when accessing a specific website. The error is related to SSL, which refers to Secure Sockets Layer, a protocol for secured data connections between clients and servers. SSL certificates ensure the data is safe and protected from prying eyes. The error may occur when a site uses an unsupported protocol.

The error originates from various places in WordPress, such as use cases and technical infrastructure(s). SSL errors could cause sites to go offline, stay inaccessible, and become useless unless fixed.

In this detailed write-up, we will explore the SSL error Err_SSL_version_or_Cipher_Mismatch, along with reasons, complications, and fixing routines for WordPress users. To this line, you should remember that the SSL protocol protects browsing data communication between a user’s browser (Google Chrome, Microsoft Edge, Firefox, Safari, or similar) and web server. SSL errors can expose sensitive information, such as credit card details, unless the error has been fixed. So, if a site’s SSL is not supported, configured, or handled properly, it can cause several issues, including ranking drops, malware attacks, and data loss of sensitive information. Some tools, like eCommerce plugins, may stop working if an SSL problem is found on a WordPress website that deals with sensitive information.

What causes the error: Err_SSL_version_or_Cipher_Mismatch

Websites That Use an Unsupported Protocol

When establishing SSL connections between a client’s browser and server, TLS ensures that a specific link is encrypted and secure. In this case, the complete form of TLS is Transport Layer Security. This scenario is often called a handshake between the client’s browser and a web server.

In this case, Two points need your attention.

  1. SSL protocol version of the client’s web browser. Generally, the parties involved in communication may be using unsupported protocol versions. You need to check.
  2. SSL version supported by the website’s SSL certificate

Note: One cause of the error (Err_SSL_version_or_Cipher_Mismatch) is the mismatch between the client’s and server’s SSL protocol versions. Simply put, the difference between a client and server’s SSL protocol versions can cause an SSL error. To find the difference, you must check on both ends – on the client’s browser and server.

Note 2: An SSL certificate comprises Cipher Suite to secure SSL connections; incompatibility between a client and server’s Ciphers can cause the SSL error. In this case, RC4 Cipher Suite refers to specific algorithms, Techniques, or rules used to secure SSL connections.


  • Keep in mind, the error or message “IP uses an unsupported protocol” is similar to “website uses an unsupported protocol”. In most cases, the fixing routine is identical.
  • In the case of “IP uses an unsupported protocol”, the trace goes back to cracking code for “TLS version support”, as described in this resource.
  • To better understand how IP works with protocols, consult a developer or network specialist for more information. Users can also ask for help from the Web Hosting support channel.

Fix the SSL Error: Err_SSL_version_or_Cipher_Mismatch

We can categorize the root culprits into two categories to fix the SSL error. Both represent different scenarios and require different approaches to deal with SSL errors.

  1. Local issues
  2. Server-side issues

Local Issues

Local issues refer to gaps in a regional system, such as a computer or a client’s outdated browser. Fixing local issues for SSL errors requires altering, changing, or monitoring the local computer or web browser’s issues, such as Cache.

Server side Issues

As its name suggests, the issues That require assistance on a server level are referred to as server-side SSL issues. In this scenario, one needs to handle, monitor, and fix gaps in server configuration, such as a Cipher mismatch in the server’s SSL certificate authority.

Note: Let’s address more details for local and server-side issues to fix the error: Err_SSL_version_or_Cipher_Mismatch.

Fixing Local Issues for SSL Error

Clear the SSL Data on the Computer

Note: Let’s learn how to clear SSL state in Google Chrome. This refers to clearing SSL state in Local PC. Similar routines are available for other browsers, such as Mozilla Firefox, Opera, and Internet Explorer.

In Google Chrome, under the (Internet Properties) dialogue box – there is an option to clear the SSL data. You can find, change, and handle the option locally in Google Chrome. Let’s address simple steps to proceed and make the change accordingly.

STEP (1) – Open your Chrome browser and proceed to land on the Settings page. Once you have opened the browser, click on the three dots in the top right corner and choose Settings. The next page shows a pack of options. Here – you can use the search bar to find the required option. Proceed and enter (proxy settings) in the search bar without brackets. Once the option That says Open your Computer’s proxy settings has come up on the screen, click to open its dialogue box – as shown in the screenshot below.

Uses an Unsupported Protocol

STEP (2)—The dialogue box’s title should read Internet Properties. Now, you’re ready to proceed to the next step. The dialogue box comprises various Tabs; choose Content and locate the option that says Clear SSL state. As shown in the screenshot below, you can click the Clear SSL state button to wipe out SSL’s data on your local computer.

Uses an Unsupported Protocol

Note: To this line, you’ve successfully cleared SSL data on the local system. Under the local reasons to fix the SSL error in question, you’ve taken the first step to fix the error. Let’s proceed and take further steps to clear the SSL error – locally.

Why do you need to clear SSL state?

  • Clearing the SSL state on a computer helps users start over from scratch. The process is identical to clearing the browser cache.
  • Clearing the Local SSL cache confirms there is no local problem on the PC. In this case, checking SSL state with external Tools returns positive results.


  • There are two kinds of SSL states—local PC data and Server Local SSL state. Sometimes, clearing the SSL state on the PC doesn’t help; you’ll need to clear the SSL cache on the Server, too. So, ask your site’s web Hosting support channel for assistance. If, on the other hand, you find an option in the cPanel interface, proceed accordingly if you know what you’re doing.
  • In this resource, we’ve discussed clearing SSL state for a specific operating system. The process is identical in most OSs, however; a slight change in interfaces may leave room for learning.

Disable Antivirus Program

Antivirus software and firewalls protect local computers and monitor communication over the Internet. In this case, an antivirus tool conducting necessary measures can cause SSL errors. If everything seems normal, and you’ve taken other precautions, you must look at the Antivirus settings.

In this case, don’t travel an extra mile. Turning off the antivirus may fix SSL issues. The disabling process is temporary in this case. Based on settings, change the particular options to keep antivirus on hold for a specific Time. This helps you observe if the process has positively affected SSL issues.

Change TLS certificate version issues to fix SSL errors

While using specific browsers, such as lower versions of Google Chrome, specific TLS versions were depreciated. In simple words, the existence of an unsupported version could create SSL issues. If you’re using an outdated web browser version, you must change, update, or take necessary measures to fix the SSL error: Err_SSL_version_or_Cipher_Mismatch.

Let’s address the matter in more detail for Google Chrome.

The following steps will fix the SSL error in question locally.

STEP (1)—Open Google Chrome and enter the following command in the address bar: chrome://flags. This will help you load SSL-related options in Google Chrome. On the next page, locate the TLS option using the search bar by entering TLS as input, as shown in the screenshot below.

Uses an Unsupported Protocol

STEP (2)—Once you’ve searched for TLS, you should see an option that says TLS 1.3 downgrade hardening. It would help if you ensured the option says Default or Enable TLS. If not, make changes accordingly. Once you’ve changed the option, you can close the window, clear the browser cache, or restart Chrome.

Let’s describe the steps you will need to take in Firefox.

STEP (1)—Like Chrome, type the following command in Firefox’s address bar: about config. This will help you locate SSL options in Firefox. Upon entering the command, the browser should show a message that requires your consent to proceed, as you will change sensitive information about Firefox’s SSL data. You should accept it and click on the relevant instructions.

STEP (2) – You can see a blank page or a pack of rows for various options on the next page. Here – search for TLS and locate the option That says security.tls.version.max. If the value on the right side of the row is 4, you don’t need to change anything. On the other hand, you can change the value to 4 if the row is telling something else – as shown in the screenshot below.

Uses an Unsupported Protocol

Note: Click the pencil icon on the right side to edit a row. In this case, before you’re able to make changes, you need to click the pencil icon next to security.tls.version.max.

Check the Internet Connection

Although it doesn’t sound good, poor Internet connection can cause SSL errors. Slow-loading sites may trigger insecure or Err_SSL_version_or_Cipher_Mismatch mistakes on screen.

Restarting the router, contacting your ISP, or checking for local misconfiguration can help promptly in such scenarios. If, for example, you want to check your Internet connection locally, here is how you can do so on a Desktop computer.

STEP (1)– Fire the Command Line using the Run command in the Start menu. Here, we discuss Windows 10 infrastructure—do as directed in other Operating Systems. Once you open the Start menu, type in “run” and choose the option that appears.

STEP (2) – In the run dialogue box, type in CMD and hit the enter key. This will load the command line interface on the screen.

STEP (3) – To check your Internet connection, type in the following command and hit Enter. ping

The command will start sending data packets to This will clarify if your Internet connection is working fine. The Internet connection is working if you see text lines on the screen.

ping tool in windows CMD

On the other hand, an inactive connection will show a message similar to the following:

Time out: Your Internet connection is out of order.

According to the message, you can see if your Internet connection is experiencing issues.

Remove Unnecessary Browser Extensions and Add-ons

Sometimes – extensions, add-ons, and 3rd party scripts create problems in web browsers. In various conditions, such extensions may trigger SSL messages on screen. If you’re clueless, extensions cause SSL errors mainly because of the conflict between multiple Tools, attachments, or scripts in a web browser. You can say that using various extensions sometimes creates issues in browsers. If possible, keep the number minimum for security, compatibility, and SSL issues.

In your browser, look for a page That lists the installed extensions, add-ons, and scripts. On the same page, you can access, remove, or deactivate a specific plugin, extension, or add-on installed in the web browser. For example, Chrome’s extensions page helps you manage the installed extensions. Similarly, to handle add-ons in Firefox, you must look for the Add-ons page under the Tools menu.

Here – the purpose of managing extensions is to cross-check between the installed assets. For example, once you have turned an extension off, you can see if the SSL error has been fixed. Similarly, try disabling extensions individually to see if things are going in the right direction.

Web browsers also support using Safe Mode for troubleshooting. In this case, you may need the Support Team’s assistance proceeding. A browser’s safe mode helps users fix specific issues while not affecting the browser’s infrastructure, disabling extensions, or changing configurative measures. When turned on, the secure mode can automatically adjust the required information for AB testing. This routine, in simple words, can help users identify a problem’s root cause and take action accordingly.

Note 2: To this line, you’ve successfully fixed the error by changing the available local options. Let’s address more opportunities on the server level to fix the SSL error (Err_SSL_version_or_Cipher_Mismatch).

Fixing Server-side Issues for SSL Error

Check the SSL Certificate’s Validity

SSL certificates are composed of foreign languages, so beginners can’t assess or handle technical issues with them. Fortunately, automated Tools are available on the Internet to help users check if their site’s SSL certificate is experiencing problems.

To proceed, head to the Qualys SSL Labs and enter your site’s URL in the input bar. The Tool will process your input and produce results within several minutes. If you need help, you can re-initiate the process from scratch. The Tool checks for common SSL errors and generates a report based on a site’s SSL certificate if the site’s SSL requires attention, as shown in the screenshot below.

ssl checker online tool

You don’t need to change further measures if your site’s SSL results show a green grade. In this case, the site’s SSL has no errors.

Note: If you’d like to keep your site’s instance on the Tool’s page secret from prying eyes, you can also hide it by checking the box below the input bar.

Note 2: You can also ask the web hosting Support channel for more information on SSL expiry. In this case, you have the following options to proceed:

  • Ask your site’s Web Hosting support channel. They’ll confirm if your site’s SSL is close to expiry.
  • Check your web Hosting account for SSL’s expiry dates.
  • Look out for email notifications from Web Hosting. Automated emails are sent to users whose SSL expiry dates are driving close.
  • If you’ve configured it, you may receive email notifications from third-party Tools. In this scenario, users whose SSL expiry date is close receive email notifications to renew SSL certificates.
  • They’ll notify you if you’ve purchased or renewed SSL from 3rd party services.

Certificate Name Mismatch

Among other errors, a mismatch in Certificate Names is a joint gap That occurs in most cases. A mismatch in certificate names may arise if two URLs share the same IP address while using different versions or certificate names on file.

There are various reasons why a mismatch in certificate names occurs. For example, while dealing with site migration, a domain name may still point to an IP address where the older version of the SSL data runs with outdated SSL information. Also, the current infrastructure incompatibility may need to be fixed in certificate names. On the other hand, if your site’s SSL certificate requires a manual change, such as inserting a domain name alias in the SSL certificate, failing to make such changes can cause a mismatch in certificate name errors.

To fix the mismatch issue for SSL error(s), you must ensure everything That shares SSL data matches each other. For example, the IP address should point to a site hosted on the same server instead of looking for roots on external resources. Similarly, if you’re using a CDN (Content Delivery Network) like Cloudflare for your site, ensure you’ve confirmed the CDN’s functionality to support external SSL certificates.

Note: Click the Lock symbol in a browser’s address bar. However, instead of seeing SSL’s information with a padlock sign in a web browser, use the Qualys SSL checker, as the padlock section may fail to fetch SSL’s data and may show information That doesn’t include necessary details.

The old version of TLS

Using TLS tests, we can obtain information about an old TLS version. In this case, TLS gaps may have resulted in SSL issues. Generally, TLS issues are covered if you’re using the latest version, such as a web browser. Similarly, if the server’s infrastructure is up-to-date, there would be no room for TLS issues. Having that clarified, TLS 1.2 is ideal for most web hosting servers and the latest infrastructure on the client side.

In this scenario, while you’re dealing with TLS issues to fix the Err_SSL_version_or_Cipher_Mismatch error, you should need support from hosting providers if fixing TLS issues requires their attention. Typically, only proceed to change or alter configurations if you know what you’re doing. If, for example – you don’t see what you need to do about TLS, ask your support channel for more information on TLS’s version. Ideally, let them handle the rest – “changing TLS version to the latest one.”

Summing up

Dealing with a site’s SSL errors is a nightmare for WordPress beginners. The information, data, or input highlighted in an SSL error may seem rocket science to most WordPress users.

In this case, start from basic options to fix SSL issues, as described in this resource. On the other hand, complex errors require extensive knowledge of how SSL works, so – don’t proceed until you’ve verified, tested, or monitored your actions on a staging site. For more information on fixing SSL issues, hiring WordPress support experts is the best option for beginners. Such services cost a small fee (One-Time) yet provide support to fix SSL issues That otherwise may not be possible with general expertise.

You can also leave comments in the section below and see if the relevant community can develop promising answers to your questions.

Frequently Asked Questions

Website That Uses an Unsupported Protocol

What is a Secure Sockets Layer (SSL) for WordPress beginners?

SSL is the standard protocol to ensure safe data communication between a client’s web browser and server. In this case, the transmitted data is encrypted across the network. The SSL mechanism comprises Ciphers and Encryption methods to ensure the sender and receiver of data are well-equipped to handshake, encrypt/decrypt, and monitor the data while the transmission process has begun.

What is meant by SSL error: Err_SSL_version_or_Cipher_Mismatch?

The error (Err_SSL_version_or_Cipher_Mismatch) occurs when an SSL handshake’s two nodes lack the required information, configuration, or data. For example, SSL/TLS protocols or Cipher information may lack or be incompatible with SSL’s nodes, a web browser, and a server. The error makes a site inaccessible and can affect business workflows, such as ROI, conversions, and revenue. The error mainly occurs due to invalid or outdated SSL certificates, configurative glitches, or outdated software.

How do you fix (Err_SSL_version_or_Cipher_Mismatch) on a WordPress website?

This article addresses various precautions, routines, and automation to check and resolve the SSL error. However, consult your site’s administrator or Support Team if you need to be more Technical to proceed. You can quickly fix the SSL error by clearing your SSL settings data in the computer, ensuring TLS information is stable, the web server’s certificates match the client’s requests, and your site’s CDN supports external SSL certificates.

How do you check SSL certificates for everyday issues?

Fortunately, checking SSL for common errors doesn’t require extensive routines. You can use Online Tools to check your site’s SSL certificate for common issues. As described above, the Qualys SSL Checker is vital in this case. You can also check your site’s SSL with Namecheap’s SSL Tester, which is available freely on Namecheap’s official website. On the other hand, in WordPress – you can see if the Tools -> Site Health page highlights SSL’s information and demands attention. Similarly, WordPress supports checking your site’s SSL with automated plugins, available on the WordPress official Plugins Directory. In this case, you can install a plugin by landing on the Add New Plugin page in the WordPress dashboard.

How do you fix complex SSL issues on a site That uses an unsupported protocol?

Fixing SSL’s complex issues requires developers’ assistance. However, you can contact your site’s web hosting support channel for more information. In this case, you should have confirmed if the error originated from the server-side factors. For example, if an SSL issue arises from the local computer, you can fix things accordingly, as described in this article. However, don’t change anything if you don’t know what you are doing. Similarly, you’ll need to probe various factors on the Server to see if the problem originated from the Web Server end.

What should I do if the measures described in this resource need to be revised for me?

Verify, re-check, and validate if you’ve taken various steps correctly. If things seem astonishing, you can leave and contact the site’s administrator. Consulting a web hosting support channel is the best option for individuals. In this case, start by doing the basics to fix SSL errors, then take complex maneuvers in order, as described in this resource. Also, ensure you’ve validated the SSL error(s) before applying measures on a live website.

wp tech support

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