After updating the nss packages to 3.19.1-1.0.fc21.x86_64 I can no longer connect to a website running tomcat (this is with firefox, chromium shows the same problem). I get the error SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key) This worked with the previous version of nss. Is something broken in the new version of nss?
After further investigation I have decided this is a legitimate consequence of a logjam ssl fix and not a bug.