How to Resolve SSL_Error_Weak_Server_Ephemeral_Dh_Key

Here we can see, “How to Resolve SSL_Error_Weak_Server_Ephemeral_Dh_Key”

Like Google Chrome, Mozilla Firefox is a widely used browser nowadays. If you’re like most people who use Firefox to browse the internet, you’ve probably encountered some technical errors while trying to access a website. Some are widespread, while others are rare and difficult to resolve. ssl_error_weak_server_ephemeral_dh_key (SSLE) is one of these faults.

ssl_error_weak_server_ephemeral_dh_key But first, let’s figure out what exactly produces this error message.

This problem is caused by a weak ssl_error_weak_server_ephemeral_dh_key

The “Diffie Hellman error” is the name of this SSL error message in Firefox. It usually occurs when a website’s security certificate is out of date and has to be updated.


Other Reasons ssl_error_weak_server_ephemeral_dh_keys Error Occurs

Most self-signed SSL/TLS certificates cause this problem. However, new browser updates prohibit the usage of self-signed SSL certificates. Other common sources of this Diffie Hellman error message include:

Bug in Your Firefox Installed

It’s rare. Using an outdated Mozilla Firefox browser may give this error message, especially one with a flaw (Firefox 31).

Modifications to Your Installed Firefox

LibPKIS functionality has been restricted since Firefox 33, making it unable to disable the library or switch to NSS code. So, the page you’re on may display ssl_error_weak_server_ephemeral_dh_key.

Incompatible Key Size

Chances are slim, but if the key size of the security certificate is less than 1024 bits, Firefox above 33 will start presenting this error notice.

Blocked Ciphers

If your Mozilla Firefox prohibits ciphers, you may encounter this Diffie Hellman error notice.

Other reasons why users may receive this error message include:

  • This website is susceptible to specific cyber attacks.
  • It’s Tomcat with no secure server certificate.
  • A secured server certificate is required to access some websites’ servers.

How to Fix ssl_error_weak_server_ephemeral_dh_key key in Firefox

Before we move into solutions, let’s run some simple checks to see if they work.


Outdated browser drivers can cause this problem. So, first, check and update the current versions. It may help. Updating the driver

  1. Ctrl+Shift+A or Open Menu
  2. Go to Add-ons.
  3. This error message is sometimes claimed to be fixed by simply refreshing the browser. Click “Help Menu” in the Firefox menu (three lines at the top right) to refresh your installed Firefox.
  4. Refresh Firefox by selecting “Troubleshooting Information” from the Help menu.

If the problem persists, try the solutions below.

Insecure Fallback Host Substitute

This approach requires you to open the secret Firefox config menu and set the security.

tls.insecure fallback hosts strings to the error domain. Follow these steps to do so:

  1. In your Firefox browser, type “about:config” in the address bar.
  2. A Caution page will appear there. Select “Warn me when I try to access these preferences” and then “Accept the Risk and Continue,” as seen below:
  3. Copy this string and paste security.tls.insecure_fallback_hosts config menu’s search bar and hit enter to get access to it. Double-click on it to open a blank Text box, type the domain name displaying the error message, and then click on the right icon next to it.
  4. Restart your Firefox browser and see if the webpage opens or if the error notice persists.

Preferences for SSL3

Follow the steps below for each installation of Mozilla Firefox that has the issue.

Open the secret config menu of the Mozilla Firefox browser.


  1. Change the preference of “security.ssl3.dhe_rsa_aes_128_sha” from true to false.
  2. Paste “security.ssl3.dhe_rsa_aes_256_sha” and set the option to false.

User Questions:

Why is Firefox so unstable?

Some apps can cause Firefox and other browsers to crash. Examine your computer and delete any malware or software causing issues. Follow your computer’s instructions to remove problematic applications. Anti-Malware Scan your PC

What is Safe Mode?

Safe Mode is a Firefox feature that can help troubleshoot issues. Safe Mode disables add-ons (extensions and themes), disables hardware acceleration and other functions, and ignores some modifications (see below to learn more).


Is Firefox closing?

The world’s most popular privacy-focused open-source browser, Firefox, is discontinuing support for Amazon’s Fire TV and Echo Show devices, the non-profit stated on its website.

How can I secure Firefox?

Go to Preferences in the main menu. Scroll down to Enhanced Tracking Protection on the Privacy & Security page. Firefox’s default protection is Standard. For additional control, select Custom.

Safe Firefox

Firefox is a secure and private browser. It’s easy to customize and has many privacy options. Firefox is also regularly updated to assist handle threats.

Leave a Comment