Hi I have implemented the listener concept as you can find under this url: http://www.isaserver.org/tutorials/2004pubowamobile.html But everytime I will connect to the external listerner via OWA or OMA/ActiveSync I will get an error message like this: 12206 The ISA Server detected a proxy chain loop. There is a problem with the configuration of the ISA Server routing policy. Please contact your server administrator. We use ISA Server 2004 Enterprise with two nodes. Regards Oli