Fix: SSL_Error_Weak_Server_Ephemeral_Dh_Key, several users will encounter the.L_Error_Weak_erver_ephemeral_DH_key error while trying to access certain Web sites.
Satisfy:
Several users are reportedly encountering the SSL_Error_Weak_Server_ephemeral_DH_key error while trying to access certain websites. The problem appears to be specific to the Firefox browser, but has been reported to only occur with several different builds.
What is causing the SSL_Error_Weak_Server_ephemeral_Dh_key error to appear?
This error is commonly referred to as Diffie Hellman error and is actually a well known bug and compatibility issue. Occurs if Firefox actively blocks some ciphers and no alternative is offered by UCCX. It could also happen that the offered alternative is not accepted by Firefox.
Basically, the error message is saying that the site you are trying to visit needs to update its security certificate to avoid making you vulnerable to Logjam’s attacks.
Even if the problem isn’t on your side, you want to log into that particular site and ignore the security warnings. You can do this quite easily (more on that below).
But first, let’s take a look at a couple of scenarios that will trigger this particular error message. We looked at this particular error message by looking at the various user reports and the methods used to fix the problem. Based on what we have collected, there are several common factors that will lead to the appearance of this problem:
- Firefox Bug– There is a well known bug that has existed since Firefox 31 is known to trigger this particular error message. The issue has since been fixed, but you may still encounter it on older builds.
- A change in Firefox behavior– With Firefox 33, the browser has switched to a more rigid libPKIS: it is no longer possible to disable this library and revert to the previous NSS code. This is why you can get around this by clicking “I understand the risks”.
- The key size used by the website is not compatible with Firefox– Another factor that could trigger the problem is the key size used by the website you are trying to visit. Starting with Firefox 33, the browser no longer supports key sizes below 1024 bits.
If you are currently struggling to resolve this particular error message, this article will provide you with a list of troubleshooting steps that have occurred. Below are several methods that other users in a similar situation have used to solve the problem.
For best results, follow the methods below in the order they are presented until you find an effective solution to work around the problem in your particular scenario.
Method 1: update Firefox to the latest version
Let’s start by making sure your Firefox is updated to the latest version. Making sure you are running the latest version available will eliminate the possibility of this error occurring due to a bug.
Several affected users reported that the issue was resolved for them after updating their browser to the latest build. Here is a quick guide on how to do this:
Open Firefox and click the action button in the top right corner. Then, go to Help and click About Firefox .
