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