title: Connecting to oracle 12c using Oracle Sql developer (remote)
body: <p>I have been trying to connect to Oracle 12c remotely by using Oracle SQL developer. It shows the below error during connecting to the server : </p>
  
  <pre><code> Status : Failure -Test failed: IO Error: The Network Adapter could not establish the connection 
  </code></pre>
  
  <p>I do can connect to oracle database on the server, but the problem is regarding to connect to this server (database) remotely </p>
  
  <p>The content of my listener.ora is : </p>
  
  <pre><code>SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
    (SID_NAME = CLRExtProc)
    (ORACLE_HOME = D:\app\ORCLNEWUSER\product\12.1.0\dbhome_1)
    (PROGRAM = extproc)
    (ENVS =  "EXTPROC_DLLS=ONLY:d:\app\ORCLNEWUSER\product\12.1.0\dbhome_1\bin\oraclr12.dll")
  )
  )
  
  LISTENER =
  (DESCRIPTION_LIST =
  (DESCRIPTION =      
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))     
  )
  )
  </code></pre>