What is causing the SSL_Error_Weak_Server_ephemeral_Dh_key error to appear?
This error is commonly referred to as the Diffie Hellman error and is actually a well-known bug and compatibility issue. It occurs if Firefox actively blocks some ciphers and isn’t offered an alternative by UCCX. It might also be the case that the alternative offered is not accepted by Firefox. Basically, the error message is saying that the site you’re trying to visit needs to bring its security certificate up to date in order to avoid making yourself vulnerable to Logjam attacks. Even if the problem is not on your side, you want to access that particular site and ignore security warnings. You can do this quite easily (more on that below). But first, let’s look at a couple of scenarios that will trigger this particular error message. We investigated this particular error message by looking at various user reports and the methods that they used to get the issue resolved. Based on what we gathered, there are several common factors that will lead to the apparition of this issue: If you’re currently struggling to resolve this particular error message, this article will provide you with a list of verified troubleshooting steps. Below you have several methods that other users in a similar situation have used to get the issue resolved. For the best results, follow the methods below in the order that they are presented until you discover a fix that is effective in circumventing the issue in your particular scenario.
Method 1: Update Firefox to the latest version
Let’s start by making sure that your Firefox is updated to the latest version. Making sure that you’re running the latest version available will eliminate the possibility of this error occurring due to a bug. Several affected users have reported that for them the issue has been resolved after they updated the browser to the latest build. Here’s a quick guide on how to do this: If you’re still seeing the SSL_Error_Weak_Server_ephemeral_DH_key error, move down to the next method below.
Method 2: Substituting the insecure fallback host
Most of the users encountering the SSL_Error_Weak_Server_ephemeral_DH_key error have managed to get the issue resolved by entering the hidden Firefox config menu and setting the security.tls.insecure_fallback_hosts string to the domain that is showing the error message. Here’s a quick guide on how to do this: If you’re still encountering the same error message, move down to the next method below.
Method 3: Enabling SSL3 preferences
Several users managed to resolve the Secure Connection Failed (ssl_error_weak_server_ephemeral_dh_key) error by enabling a couple of preferences from the about:config menu. This particular fix was reportedly effective for a lot of users that were unable to access their router due to this particular error message. Here’s a quick guide on enabling the SSL3 preferences:
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