seems to use a wildcard certificate issued for CN = *.eclipse.org
very likely the same that is used for other services and URLs,
It has been renewed 17/01/17 and is valid until 02/03/2020
with the fingerprints below. My personal guess is that *some*
front end servers serving bugzilla are using the relatively
new certificate, while others are still using a now expired
certificate (which would explain why only some people are
Just a blind guess...