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From: jbm at (Jean-Baptiste Marchand)
Subject: IIS 5.0 random/fixed TCP/UDP ports

* thalm <> [01/01/70 - 01:00]:

> When viewing the ports associated with inetinfo.exe (Windows 2000
> Server with IIS 5.0 in a default configuration) using TCPView I see
> port 80 (TCP) , 443 (TCP), another TCP strange and random port and one
> UDP port (3456)
> Example in one machine: TCP 80 TCP 443 TCP 1055 UDP 3456
> Example in another machine: TCP 80 TCP 443 TCP 2086 UDP 3456
> Already tried to connect to the random TCP port, and write to it, but
> the server does not return a thing.  What are the random TCP and fixed
> UDP port for?

As detailed in the IIS 5.0 section of our Windows network services
minimization paper, IIS 5.0 runs RPC services over TCP/IP:

The dynamic TCP port is used by IIS remote administration RPC services.

You should also observe a dynamic UDP port. You can check with ifids
that RPC services are bound on these endpoints.

udp/3456 is used by IIS 5.0 internally. Microsoft finally documented
this port a few months ago, see

Jean-Baptiste Marchand

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