问题：启动监听时候报错

[oracle@CRM ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 04-3月 -2012 03:42:20

Copyright (c) 1991, 2005, Oracle. All rights reserved.

Starting /home/app/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
解决方法：查看hosts文件

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost

该条记录需要存在，不能注释掉