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I received the error code:1521 (couldnot hand off client connection)I'm sorry, but if you don't give me correct information I won't be able to help you. 1521 looks like the listener port...
Here's what that error means :
$ oerr ora 1521 01521, 00000, "error in adding data files" // *Cause: During CREATE or ALTER TABLESPACE, an error was detected // while adding data files. // *Action: Check the error stack for detailed error information. $