In the default Tomcat distribution, and JIRA Standalone, there is a commented-out AJP connector:

        <!-- To connect to an external web server (typically Apache) -->
        <!-- Define an AJP 1.3 Connector on port 8009 -->
        <!--
            <Connector port="8009" 
              enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
          -->

This has been removed from Confluence Standalone.

I think it should be re-added (perhaps using port 8010 to avoid conflicts with JIRA), since AJP is a) required for connecting to IIS, b) the simplest way to get SSL working, c) regaining traction now that mod_proxy_ajp is bundled with major distributions.