Error SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY In Firefox

When using Firefox to access certain websites you may get the error SSL_ERROR_WEAK_SERVER_EPHEMERAL_DH_KEY as per the example shown below.

Here is how to fix this error :-

1. In the browser bar type about:config

2. This will open a big list locate the following two options and set them to FALSE

  • security.ssl3.dhe_rsa_aes_128_sha
  • security.ssl3.dhe_rsa_aes_256_sha

3. Re load the website that you could not access and this should now load ok.



Duncan is a technology professional with over 20 years experience of working in various IT roles. He also has a wide range of other skills in radio, electronics and telecommunications.

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He also has a wide range of other skills in radio, electronics and telecommunications.

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