CreateFile() Call Fails for Named Pipe

Hi. I have a server application that creates a named pipe using the following call:

    CreateNamedPipe( "\\\\.\\pipe\\MyPipe"                           ,
                     (PIPE_ACCESS_DUPLEX | WRITE_DAC)                ,
                     (PIPE_TYPE_BYTE | PIPE_READMODE_BYTE PIPE_WAIT) ,
                     10                                              ,
                     1024                                            ,
                     1024                                            ,
                     0                                               ,
                     0                                               );

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and a client application that does the following twice:

    WaitNamedPipe( "\\\\.\\pipe\\MyPipe" ,
                     NMPWAIT_WAIT_FOREVER );
    hOut = CreateFile( "\\\\.\\pipe\\MyPipe" ,
                       GENERIC_WRITE         ,
                       0                     ,
                       NULL                  ,
                       OPEN_EXISTING         ,
                       FILE_ATTRIBUTE_NORMAL ,
                       NULL                  );
    WriteFile(  hOut           ,
                "Hello"        ,
                5              ,
               &dwBytesWritten ,
                NULL           ) );
    CloseHandle(hOut);

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Everything works great the first time, but the second time, the CreateFile() client call never returns.  Do you have any idea what the problem could be?  Thank you.