For additional information on about how to configure a one-to-one translation, please refer to your manufacturer's documentation.Ī 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 takes all requests for a specific address on the public network and passes them directly to the private network. This is also called opening a pipe or tunnel between the public and private networks. WorkaroundĪ work-around for firewalls or proxy servers that aren't based on Microsoft Windows NT is to perform a one-to-one translation between the two networks. Additionally, Outlook can have problems resolving the name of the Microsoft Exchange Server computer behind the firewall or proxy server. This causes the client not to connect to the server. When the IP packets that contain the remote procedure call (RPC) information are edited during translation, the IP packets lose the RPC connectivity information. Outlook clients can't connect through a firewall or proxy server that is performing NAT between public and private networks.
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