TARA communication issue(using tivoli as backup solution)

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TARA communication issue(using tivoli as backup solution)

I am facing issue when i am triying to take backup of TD DB through TARA gui

** Failure ARC0805:Access Module returned error code 34:

                     Error BAM1012: Tivoli dsmInitEx error 137: ANS1025E (RC137)

                      Session rejected: Authentication failure

i am new on this product, help from u people is realy appreciable.(thanx in advance)