Hi,
The following worked for me.
Install the arr helper and change the file c:\Windows\System32\inetsrv\config\schema\arr_helper_schema.xml like so:
replace: <attribute name="xForwardedForHeaderName" type="string" defaultValue="X-Forwarded-For" />
with: <attribute name="xForwardedForHeaderName" type="string" defaultValue="X-Cluster-Client-Ip" />
you need to enable the add_cluster_ip property on the traffic manager also.