After upgrading to firefox 31.0 on ubuntu 12.04 access to an internal website broke. with the message : SSL peer selected a cipher suite disallowed for the selected protocol version. (Error code: ssl_error_cipher_disallowed_for_version) Note that firefox 30.0 on ubuntu 12.04 still works (tested on another machine) against the website . running cipherscan against the server revealed : prio ciphersuite protocols pfs_keysize 1 ECDHE-RSA-AES256-SHA SSLv3 ECDH,P-256,256bits 2 DHE-RSA-AES256-SHA SSLv3 DH,1024bits ... Disabling security.ssl3.ecdhe_rsa_aes_256_sha (setint it to false) in about:config renabled access. So it appear to me ECDHE-RSA-AES256-SHA is broken in 31.0 on ubuntu . Anyone else have the same problem?