Oracle SQL Developer: Failure - Test failed: The Network Adapter could not establish the connection?

Question

Problem

Please note that I changed details for security purposes. However, the problem remains intact.

I installed an Oracle 11g database on a server at l

Answer 1

You can locate a file named listener.ora under the installation folder oraclexe\app\oracle\product\11.2.0\server\network\ADMIN It contains the following entries

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = Codemaker-PC)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

You should verify the HOST (Here it is Codemaker-PC) should be the computer name. If it's not correct the change it as computer name.

then try the following command on the command prompt run as administrator,

lsnrctl start