ora-28547:连接服务器失败，可能是 Oracle Net 管理失败

检查如下：

监听程序的配置文件 发现多了 (PROGRAM = extproc) 

去掉后如下：

# listener.ora Network Configuration File: C:\oracle\admin\product\11.2.0\dbhome_1\network\admin\listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = orcl)
      (ORACLE_HOME = C:\oracle\admin\product\11.2.0\dbhome_1)
      (ENVS = "EXTPROC_DLLS=ONLY:C:\oracle\admin\product\11.2.0\dbhome_1\bin\oraclr11.dll")
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.1.127)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = C:\oracle\admin

再次执行可提示成功