An attempt was made to access a socket in a way forbidden by its access permissions

I've got code that's been working for years, now running on Win2003 Server
whiled logged in as the admin.

When the MS sec fixes were installed last night, this code now fails with:

System.Net.Sockets.SocketException: An attempt was made to access a socket in a
way forbidden by its access permissions

IDictionary props = new Hashtable();
props["name"] = "tcp";
props["port"] = 1234;
props["rejectRemoteRequests"] = "true";
props["bindTo"]= "127.0.0.1";

BinaryServerFormatterSinkProvider srv = new BinaryServerFormatterSinkProvider();

TcpServerChannel chnl = new TcpServerChannel(props,srv); // fails here

How can this not work - the user is the Admin?

This seems to only affect Win2003, not XP?

Help - my app is completely down until I can resolve this.
--
Thanks in advance, Les Caudle
.

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