DCOM over the Internet

This document will address how to configure DCOM for use over the Internet and cooperate with firewalls.

Set default authentication level to NONE in DCOMCNFG for both server and client.

Make the following changes to the registry:

HKLM/Software/Microsoft/Rpc/Internet
    PortsInternetAvailable="Y"
    UseInternetPorts="Y"
    Ports="3000-4000"

Open port #135 AND the range above on the firewall
Disable IP address translation

Notes:
1) HTTP tunneling for DCOM should be available in NT service pack 4, which is slated for delivery in late June, 1998.
2) Check out the paper by Mike Nelson for more information on using DCOM over the internet with firewalls.

Last update: February 17, 1999