OEM报错：ORA-12541: TNS:no listener (DBD ERROR: OCIServerAttach)

#oracle版本 10.2.0.1

OEM登录报错，ORA-12541: TNS:no listener (DBD ERROR: OCIServerAttach)

重启lsnrctl，emctl多次无效。

删除listener.ora,tnsnames.ora，使用netmgr配置后问题无法解决。

网上找了下资料，问题listener.ora：

LISTENER =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST =192.168.217.2)(PORT = 1521))
  )

应更正为：

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.217.2)(PORT = 1521))
    )
  )

即需要添加

DESCRIPTION_LIST =

一行。

使用netca配置后，文件已更正，问题消失。

原因尚不能解释。

10g文档里面此报错信息：

ORA-12541: TNS:no listener

Cause: The connection request could not be completed because the listener is not running.

Action: Ensure that the supplied destination address matches one of the addresses used by the listener - compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on the remote machine.

大意是说：监听没有运行导致连接请求没有完成。解决办法是检查tnsnames.ora和listener.ora文件IP地址是否匹配，如否，改成一样后启动监听。

感觉这种说法和我遇到的问题不吻合。