Error invoking loca Web sevice behind a firewall

Hi,

My mule instance is behind a firewall and I need to invoke 2 Webservices the first one is external and the second one is internal (also behind the firewall), Mule send the local invocation to the firewall an failed. The http:connector element does not support the nonProxyHosts attribute, so I don't know how to configure mule in order to resolve local end points without the proxy.

This is a critical issue I need help very urgent. Thanks.