Avatar images server from community.jboss.org (this king of URL http://community.jboss.org/people/velias/avatar/24.png) have expire headers set too far in future (10 years), which brings problem when I use avatar picture in jira - when user changes avatar in community, jira still shows old avatar. Reconfigure these headers to some meaningfully shorter value (one week, one month or so) so jira shows correct avatarts after some time.