Arthur,
i think i know the issue here. zirconium is indeed a shared host, so it runs several misc. web services using https on a single IP, so we rely on clients speaking SNI to get the correct virtual host.
java 6 and IE on XP are among the few clients who don't.
I think your applications are java and don't speak SNI, so they are getting the first virtual host, which is planet.
this can be fixed by either:
use Java 7 which should support SNI .. see f.e. http://stackoverflow.com/questions/12361090/server-name-indication-sni-on-ja...
quote " on Java 7 use
new URL("https://cmbntr.sni.velox.ch/%22).openStream()
until HTTPCLIENT-1119 is fixed"
or i can cheat by changing the order Apache loads the site configs, f.e. i could make it
sites-enabled/001-Bugzilla , ./002-Planet etc. Then those clients who don't speak SNI get Bugzilla (but the Planet users don't get their planet, but Bugzilla seems more important.
or we would have to get an extra IP address just for Bugzilla