I receive an Error “Err_SSL_Weak_Server_Ephemeral_DH_Key”

Feb 3, 2017

Weak Diffihelman key

Resolution

If a secure website gets the error ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY, it means the website is trying to set up a secure connection, but it is actually IN-secure because the SSL/TLS uses a Diffie-Hellman group size smaller than 1024-bit.

This is the problem in the Logjam vulnerability, which affects both browsers and servers:   https://weakdh.org

In this case, the website/webserver needs to be fixed. So please contact the webserver administrator the disable weak DH keys and enable only strong Ciphers

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