oracle10g监听出错,导致无法连接

# listener.ora Network Configuration File: E:\database\oracle\product\10.2.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = E:\database\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
    )(SID_DESC =
  (GLOBAL_DBNAME = crfdb)
  (ORACLE_HOME = E:\database\oracle\product\10.2.0\db_1)
  (SID_NAME = crfdb)
  )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    )
  )