Shibboleth audit logging - Fails to capture client browser IP (x-forwarded-for) in IdP/Tomcat

[Petursson, Sigurdur]

Our system architecture is:
   F5 -> WinServer2012/IIS -> WinServer2012/Tomcat6.

We followed this documented approach to get the x-forwarded-for IP info 
into our Shib audit logs:
http://serverfault.com/questions/516376/logging-x-forwarded-for-ip-in-shibboleths-audit-logs


In server.xml:
...
         <Valve className="org.apache.catalina.valves.RemoteIpValve"
            remoteIpHeader="X-Forwarded-For"
            protocolHeaderHttpsValue="https" />

...


In logging.xml under the IDP_AUDIT appender:
...
         <encoder 
class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
             <charset>UTF-8</charset>
<Pattern>%msg|%X{req.xForwardedFor}|%n</Pattern>
         </encoder>
...

This has been unsuccessful so far, no client IP appears in the log. Any 
ideas?


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