A one-to-one translation or pipe does not work for Windows NT-based firewalls and proxy servers because the Outlook client attempts to bind to the end-point mapper port (EPM), port 135, on the firewall. This server does not return the correct Exchange Server connectivity information to the Outlook client.
Another possible work around is to use Outlook Web Access. This only requires allowing HTTP traffic through the firewall or proxy server.
RFC 1918 - Address Allocation for Private Internets
ID d'article : 291615 - Dernière mise à jour : 31 janv. 2007 - Révision : 1