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[SoDoRo]

<FTP Enable="Yes">
         <User>xbox</User>
         <Password>xbox</Password>
         <Port>21</Port>
         <MaxUsers>3</MaxUsers>
         <AllowAnon>No</AllowAnon>
         <Greeting>Welcome to XBOX FTP Server</Greeting>
      </FTP>

It's the Server busy bug. Increase the MaxUser value will help solve the problem.