Apache2 & Mongrel & Pen - 502 Proxy Error

Hi, I'm getting an Proxy error when trying to use Filecolumn with my new server setup. Everything else on the site works fine though. I believe the server is timing out but I'm not sure why. He's the info.

- Error when try to upload with Filecolumn - Debian 3.1 Sarge - Mongrel Cluster with three instances running - Ruby 1.8.4 - Pen load balancer

Apache Conf: <VirtualHost mysite.com:80>    ServerName mysite.com    ServerAlias www.mysite.com    ProxyPass /    ProxyPassReverse /    ProxyPreserveHost on </VirtualHost>

Apache Error: [Mon Sep 18 03:55:54 2006] [error] [client] proxy: error reading status line from remote server, referer: http://mysite.com/photo/new/6 [Mon Sep 18 03:55:54 2006] [error] [client] proxy: Error reading from remote server returned by /photos/create, referer: http://mysite.com/photo/new/6

HTTP Error Message: Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /photos/create. Reason: Error reading from remote server

Any idea why I would keep on getting this error? RMagick seems to be working fine. When I go into irb and type Require "RMagick" it returns true. Any help would be greatly appreciated.

Cheers, Eric