FC9上网问题！

系统装上后，配置网络连接成功了。今天怎么又连接不成功，ifup etho 出现下面的问题：
正在决定 eth0 的 IP 信息...dhclient(3308) is already running - exiting.
This version of ISC DHCP is based on the release available
on ftp.isc.org.  Features have been added and other changes
have been made to the base software release in order to make
it work better with this distribution.
Please report for this software via the Red Hat Bugzilla site:
    http://bugzilla.redhat.com
exiting.

高人指点哈，什么问题啊！