RFC_ERROR_LOGON_FAILURE

Hi Forum,

I am trying to consume a BAPI from JAVA. For this, i copied a SAPJCO.JAR and two dlls by the name sapjco.dll and librfc.dll from SAP Market place. When i make a call to SAP, i am getting an error

"RFC_ERROR_LOGON_FAILURE" - : Name or password is incorrect (repeat logon)

I am very sure that the user name and password that i provided are correct. I tried with different user names which have administrator rights. I feel that there is some extra authentication required to connect to SAP remotely.

Can any one ever faced this problem ? Please help me in this regard.