The Diffie-Hellman (DH) key exchange is a way for two parties involved in an SSL transaction that have no prior knowledge of each other to agree upon a shared secret over an insecure channel. This secret can then be converted into cryptographic keying material for mainly symmetric key cipher algorithms that require such a key exchange.
This feature is disabled by default and should be specifically configured to support ciphers that use DH as the key exchange algorithm.
To generate a DH key by using the command line interface
At the command prompt, type the following command:
create ssl dhparam <dhFile> [<bits>] [-gen (2 | 5)]
To generate a DH key by using the configuration utility
Navigate to Traffic Management > SSL and, in the Tools group, select Create Diffie-Hellman (DH) key, and generate a DH key.