At present, Crowd will only work with Resin versions 3.0.23 - 3.0.26. Something has changed in Resin 3.1.x and 3.2 that causes the remote_address value to be nulled out.

User authenticates.
Authentication is successful.
Crowd attempts to redirect to start page.
Token is checked again but the remote_address value is nulled out causing a redirect to the login page.

We have tried enforcing the xerces XML parser with no change. This requires more investigation with the dev team.