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Hi !
I had the same problem untill I found out that those namespaces are not included in the mscorlib package, that VS2003 uses.
Instead, add a new reference to your c:\windows\microsoft.net\framework\vXXX\\system.runtime.remoting.dll which contains the tcp and http channels.
If in doubt, check the refferences in your object browser. In the bottom of the screen you can see the exact package that ay given reference is contained in.
Regards