All: As everyone in our community can benefit from improving security I thought I would share this observation with everyone. I recently realized that Iceweasel, by default, is not configured to not support the recent versions of TLS yet it accepts weak ciphers. You can check your browser here (notably TLS version) https://www.howsmyssl.com/ Here's how to fix this in Firefox http://kb.mozillazine.org/Security.tls.version.* I set security.tls.version.min = 2 (require at least TLS 1.1) I set security.tls.version.max = 3 (support TLS 1.2) As for the accepted ciphers I went to about:config, searched for RC4 and set all variables to false. Now when I encounter a website that insists on TLS 1.0 or RC4 I know it's insecure (and I load it in another, vulnerable browser). That's how I found fosdem.org doesn't support TLS 1.1 or 1.2. Server Check https://www.ssllabs.com/ssltest/analyze.html?d=fosdem.org Currently TLS 1.1 and 1.2 are not supported! Server Fix (TLS versions and cipher suites for PFS) https://wiki.mozilla.org/Security/Server_Side_TLS For example on my server I favor PFS and completely disable RC4, for example: SSLProtocol all -SSLv2 SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128:AES256:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!3DES:!MD5:!PSK SSLHonorCipherOrder on SSLCompression off Stay safe out there! --Tom