请进行如下操作：
　　[root@localhost Desktop]# service network restart
　　Shutting down interface eth0: Error: Device \'eth0\' (/org/freedesktop/NetworkManager/Devices/0) disconnecting failed: This device is not active
　　[FAILED]
　　Shutting down loopback interface: [ OK ]
　　Bringing up loopback interface: [ OK ]
　　Bringing up interface eth0: Error: Connection activation failed: Device not managed by NetworkManager or unavailable
　　[FAILED]
　　[root@localhost Desktop]# chkconfig NetworkManager off
　　[root@localhost Desktop]# chkconfig network on
　　[root@localhost Desktop]# service NetworkManager stop
　　Stopping NetworkManager daemon: [ OK ]
　　[root@localhost Desktop]# service network start
　　Bringing up loopback interface: [ OK ]
　　Bringing up interface eth0: [ OK ]
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　RTNETLINK answers: File exists
　　[root@localhost Desktop]# service network restart
　　Shutting down interface eth0: [ OK ]
　　Shutting down loopback interface: [ OK ]
　　Bringing up loopback interface: [ OK ]
　　Bringing up interface eth0: [ OK ]
　　[root@localhost Desktop]# ifconfig
　　eth0 Link encap:Ethernet HWaddr 00:0C:29:A0:C6:44
　　inet addr:192.168.1.189 Bcast:192.168.1.255 Mask:255.255.255.0
　　UP BROADCAST MULTICAST MTU:1500 Metric:1
　　RX packets:0 errors:0 dropped:0 overruns:0 frame:0
　　TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
　　collisions:0 txqueuelen:1000
　　RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
　　
　　lo Link encap:Local Loopback
　　inet addr:127.0.0.1 Mask:255.0.0.0
　　inet6 addr: ::1/128 Scope:Host
　　UP LOOPBACK RUNNING MTU:16436 Metric:1
　　RX packets:12 errors:0 dropped:0 overruns:0 frame:0
　　TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
　　collisions:0 txqueuelen:0
　　RX bytes:720 (720.0 b) TX bytes:720 (720.0 b)
　　
　　[root@localhost Desktop]# iptables -L
　　Chain INPUT (policy ACCEPT)
　　target prot opt source destination
　　ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
　　ACCEPT icmp -- anywhere anywhere
　　ACCEPT all -- anywhere anywhere
　　ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh
　　REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
　　
　　Chain FORWARD (policy ACCEPT)
　　target prot opt source destination
　　REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
　　
　　Chain OUTPUT (policy ACCEPT)
　　target prot opt source destination
　　[root@localhost Desktop]# iptables -F