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I have a TMG 2010 firewall between some office networks, which handles routing and firewalling; I need to let some application-specific multicast traffic flow between these networks; this is UDP traffic on a custom port (10234), with destination multicast addresses in the form 224.X.Y.Z.

I already followed the steps here, but it doesn't work: TMG keeps complaining about the destination address being invalid.


Denied Connection
Status: An ingoing packet was dropped because its destination address does not exist on the system, and no appropriate forwarding interface exists.
Rule: None - see Result Code
Source: SOURCE NETWORK AND ADDRESS
Destination: External (224.0.1.1:10234)
Protocol: CUSTOM UDP PROTOCOL


1) Can TMG actually route this type of traffic?
2) How?

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  • Should this be moved to networkengineering.stackexchange.com?
    – Paul Gear
    May 30, 2013 at 23:13
  • If someone there is able to answer, it's ok for me...
    – Massimo
    May 31, 2013 at 6:17

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