监听器启不起来

报错：

Starting /opt/oracle/product/10.2.0/db_1/bin/tnslsnr: please wait... 
TNS-12537: TNS:connection closed
 TNS-12560: TNS:protocol adapter error
  TNS-00507: Connection closed
  Linux Error: 29: Illegal seek

上网查了一下原因：
方法一：
修改 /etc/hosts  加 127.0.0.1 localhost问题解决。

127.0.0.1 db.e-trade.com db localhost

注：db.e-trade.com 与localhost并列的关系

方法二：

在listner.ora文件上添加如下语句：

SUBSCRIBE_FOR_NODE_DOWN_EVENT_=OFF

To implement the solution, please execute the following steps:
1. Explicitly disable the TNS Listener's subscription to ONS by editing the listener.ora file and add the parameter below:
SUBSCRIBE_FOR_NODE_DOWN_EVENT_=OFF
       where would be replaced with the actual listener name configured in the listener.ora file.
For example, if the listener name is LISTENER (default), the parameter would be:
SUBSCRIBE_FOR_NODE_DOWN_EVENT_LISTENER=OFF
       - Save the listener.ora file
2. Start the TNS Listener from a new LSNRCTL prompt:
lsnrctl
LSNRCTL> start

From metalink:

Note:294730.1
Note:315720.1