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Having trouble creating new connection in SQLDeveloper

1005659Apr 26 2013 — edited May 2 2013
When I try to create a new connection in SQLDeveloper, I get the following message:

Status : Failure -Test failed: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

The username and password are the same as the ones I use to connect to sqlplus, right? I am a complete newb to sql, so I would really appreciate if someone could provide a step-by-step solution.
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Locked on May 30 2013
Added on Apr 26 2013
#sql-developer
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