To summarize what happened on the Mozilla side, my problem at least is a consequence of a fix for LogJam. Thunderbird can't connect because the DH key is no longer considered secure, so it silently fails. No fix is coming. The best solution is to get your sysadmins to update the key. The workaround is to go into Thunderbird's config editor and change the following to False:
security.ssl3.dhe_rsa_aes_128_sha security.ssl3.dhe_rsa_aes_256_sha security.ssl3.dhe_dss_aes_128_sha security.ssl3.dhe_rsa_des_ede3_sha In some cases, some of these may need to be created first. Note: I would assume that tampering with your security settings to allow less- secure connections may not be a great long-term strategy. The workaround above works for me. If it doesn't work for you, you may have a separate problem. In that case, I'd suggest checking that the problem exists in Thunderbird as downloaded from Mozilla, then submitting a new bug to Mozilla, saying that changing these four things didn't work. They'll probably want to know your mail server's URI, protocol, port, and connection security. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1477987 Title: Thunderbird 1:31.8.0+build1-0ubuntu0.15.04.1 never asks for account password To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1477987/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs