ORA-28547: connection to server failed, probable Oracle Net admin error解决办法

listener.ora是服务器端的配置oracle的文件。
后来将listener.ora的这一行 ：(PROGRAM = extproc) 注释掉，就行了

修改为：

SID_LIST_LISTENER =

  (SID_LIST =

  (SID_DESC =

  (SID_NAME = prod)

  (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
# (PROGRAM = extproc)

  )

  )
LISTENER =

  (DESCRIPTION_LIST =

  (DESCRIPTION =

  (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.8)(PORT = 1522))

  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))

  )

  )
PROGRAM = extproc 外部程序调用，现在已经没用了。