Lỗi err_ssl_version_or_cipher_mismatch


SSL errors are one of the most comtháng problems encountered by mạng internet web1_users. While the error message in a browser might be quite scary for beginners, this problem is actually quite easy to lớn solve sầu. In this article, we will help you to lớn resolve sầu the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error message quickly và effectively.

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Every time you try to lớn connect khổng lồ a trang web, your browser will automatically check the SSL certificate of the trang web. Checking the certificate is a way khổng lồ prove that the accessed trang web is genuine & has implemented the right protocol lớn secure your connection.

When the protocol configured on the website’s hệ thống appears to lớn be unsafe, your browser will automatically display an error message, such as ERR_SSL_VERSION_OR_CIPHER_MISMATCH.

This message is basically the browser’s way khổng lồ protect you from accessing unsafe websites.

In addition, the website you’re trying to lớn access may also use an old version of a protocol that has some serious security holes which might endanger your device.

Furthermore, it is important lớn note that ERR_SSL_VERSION_OR_CIPHER_MISMATCH error message only appears when you try to lớn access websites that use SSL and HTTPS encryption to secure the access & information exchange.

The website that uses these encryptions have a loông xã ibé in the URL bar.

It is also worth mentioning that this problem is more likely to lớn occur on Google Chrome và Internet Explorer.

Why Does It Appear in Your Browser?

ERR_SSL_VERSION_OR_CIPHER_MISMATCH error message can be caused by various things, ranging from the incompatibility of one or more SSL certificates with the components on your device to the problems with system security web1_settings such as firewalls and antiviruses that are not properly configured.

Another comtháng cause of this error is QUIC (Quiông xã UDPhường Internet Connections) protocol.

Moreover, other small things such as old cookies and stacked up browser history can also interfere with the security of the connection.


As we have sầu previously mentioned, while the message looks complicated and bit intimidating for a beginner, it is actually quite easy to fix as long as you know the right methods to lớn deal with it.

There are at least five sầu effective methods that you can try khổng lồ resolve the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error:

1. Chechồng Your SSL/TLS Certificate

Checking your SSL/TLS certificate might be a good place to start fixing the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error. If your TLS/SSL certificate is old or broken, you should not be surprised if a lot of error messages appear every time you surf the mạng internet.

To check your SSL/TLS certificate, you can use SSL Labs.

This tool will grade your SSL connection & detect if there is any mismatch in a hệ thống. It can also insize whether your SSL/TLS is old và needs an update.

Here is an example of an SSL report from nguyenminhchau.com using this amazing tool:


2. Enable TLS 1.3 Support

TSL (Transport Layer Security) provides a secure connection between your browser & the web server. This layer is the direct successor of the SSL technology.

If this feature is disabled, it might be the reason why your browser rejects the certificates of some websites.

Luckily, most of the modern browsers, such as Google Chrome, are already equipped with TLS 1.3 by default.

However, if you have sầu an older version of Chrome, you need khổng lồ follow these steps to enable your browser TLS support:

Open Google ChromeType in chrome://flags in Chrome’s URL bar, then hit enterNow search for TLS Set the TLS 1.3 tư vấn to lớn Enable

However, note that this will not be available in the newer version of Google Chrome.

For instance, if you try those steps in Chrome version 80.0.3987.122, you will only find the TLS 1.3 downgrade hardening which functions lớn “harden” the TLS 1.3 connections & provides downgrade compatibility for the older TLS (phối it to default).

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3. Disable QUIC Protocol

QUIC (Quichồng UDP Internet Connections) protocol is an experimental project of Google that can skết thúc simple packages using User Datagram Protocol (UDP) without connection.

Although QUIC is known as an excellent alternative sầu to other well-known security solutions such as TCPhường, HTTP/2, and TLS/SSL, this protocol often causes the appearance of the mixed-nội dung warning, including ERR_SSL_VERSION_OR_CIPHER_MISMATCH.

Therefore, you may need lớn disable this protocol to lớn solve sầu the SSL/certificate connection problem. Here are the steps to lớn disable it in Google Chrome:

Open Chrome, then type in chrome://flags in the URL bar and hit enter.You will land on the experimental feature page, search for QUIC.Set the Experimental QUIC Protocol lớn Disable.Done!

Keep in mind that there are other methods lớn disable QUIC protocol, such as using Application control or Firewall Policy. However, we bởi vì not recommover you khổng lồ use it since these methods require a bit of expertise.

4. Clear Your Web History/Cache

Web history & cache will store data on sites that you have sầu visited in the browser. The data can be text, images, or files. Activating the cabít allows you to lớn access website pages faster.

However, storing old cabít is a bad habit, especially if the sites you have visited has already updated its system. If you bởi vì not delete cabịt for a long time, it might cause an SSL error & long-term security risks.

Therefore, wiping your device’s cabịt and restarting your browser sometimes is the best solution to resolve sầu ERR_SSL_VERSION_OR_CIPHER_MISMATCH.

If it does not solve sầu the error, you might need khổng lồ clear the SSL State in your browser.

Here are the steps khổng lồ clear SSL State in the lachạy thử version of Google Chrome (ver. 80.0.3987.122):

Cliông chồng Clear SSL State, then hit OK.

5. Disable Your Antivirut or Firewall

Improper configuration of antivi khuẩn and/or firewall can also cause connection security problems that result in the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.

Poor configuration can also cause some false alarms that cause a safe trang web detected as a dangerous site.

Therefore, it is better to leave your firewall web1_settings khổng lồ default. You can also disable it, but this action may cause critical security problems. Do it at your own risk.

Moreover, if you run antivirus software or any type of security program installed on your computer, the software might have sầu an automatic SSL scanning. Disabling the SSL Scan could help you to get rid of error messages on the website.

The steps lớn disable an automatic SSL scanning in an antivi khuẩn vary. However, if the one you are using has an SSL Scan option, just turn it off.

What If All of Them Didn’t Work?

While we think that the above sầu methods should be enough lớn fix the ERR_SSL_VERSION_OR_CIPHER_MISMATCH in your browser, sometimes they might not work because of some shenanigans.

If it happens, we strongly advise you khổng lồ reinstall your website browser. Do not forget to lớn check your browser version, you may need to update it lớn the newest one.

Moreover, an older operating system such as Windows XP. & Vista has a bigger risk of stumbling upon an SSL error. Thus, you have sầu lớn update your OS in order to lớn prsự kiện the error. If you already have the lakiểm tra OS, try checking for the lademo major update.


If you happen to lớn get the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error message while surfing the internet, there are some things you can do:

If you use an older browser, you might need khổng lồ enable the TLS 1.3 tư vấn.Make sure that you have sầu disabled the QUIC protocol since it can cause SSL error in some websites.Try to lớn clear all of your browser history và cache. There might be an old configuration in the cabít that interferes with your connection.Try disabling your antivirus và kiểm tra the firewall configuration, make sure everything is set to lớn default. If your antivirus has an automatic SSL scanning, turn it off.

Finally, the first thing you need lớn vì while getting an unexpected error message in your browser is to calm down và read the error message carefully.

Most people often freak out when stumbling upon an error lượt thích this và forcefully cthất bại or restart their browser without paying attention khổng lồ the message. Whereas, without a proper fix, there is a big chance that the error will occur again, sooner or later.