Not sure. I believe it is missing one of the Certificate Key Usage attributes which firefox feels is required. The list of all certificate key usage values is here: http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html
However, I'm not sure which usage values firefox wants. You can retrieve the details of a certificate from a server by doing: 'openssl s_client -showcerts -connect [host]:[port] | openssl x509 -text'. Looking at your examples, that would be 'openssl s_client -showcerts -connect localhost:8000 | openssl x509 -text' -- default ssl certificate is invalid https://bugs.launchpad.net/bugs/187341 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs