Symptoms

When the atlassian-crowd.log show the following WARN and FishEye/Crucible is running behind a proxy server with IPV6 disabled:

2012-08-01 21:44:51,447 http-8095-1 WARN [crowd.manager.proxy.TrustedProxyManagerImpl] Received invalid IP address: 0:0:0:0:0:0:0:1%0

Cause

This is caused when using 0:0:0:0:0:0:0:1 as the remote address of the application defined in Crowd.

Resolution

The 0:0:0:0:0:0:0:1 is the IPV6 equivalent of 127.0.0.1 in IPV4.

To fix this you will have to disable IPV6 on all the interfaces of the hosts who are connecting to Crowd (and the host who is running Crowd) so that they will only use IPV4.