When you install Microsoft Exchange 2000 Server into a child domain, Setup stops working the first time with the following error message:
The Directory Service is busy.
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This behavior occurs because of the way the named pipe transport works. The server side creates an instance of the pipe for use by clients. The first client to attempt a connection is associated with that instance. To allow another client to connect, the server must create another instance of the named pipe. If another client attempts to connect before the new instance is created, the server appears (to the second client) not to be accepting connections.
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To work around this problem, rerun Exchange 2000 Setup, click Change, and then install the components that did not install the first time around. After these steps have been completed, Exchange 2000 Setup will finish successfully.
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