We're running Jira behind a reverse proxy (IIS) and since yesterday over SSL. The certificate is added to the IIS-site. Everything seems to work fine but when I access the site I get this little irritating warning about Blocked content.

Anyone who knows what I might have done wrong? For example, do I need to install the certificate to jira as well?
Any input on this is most appreciated. If you need some more info please ask.
//Mattias