打开/etc/hosts，加入一行：127.0.0.1 [计算机名]，
如：127.0.0.1 pc3
这是因为更改计算机名后，未自动更新hosts文件造成的。
相关日志：
[Sun Aug 11 07:49:11.808597 2013] [suexec:notice] [pid 982] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sun
Aug 11 07:49:11.841662 2013] [unique_id:alert] [pid 982] (EAI 5)No
address associated with hostname: AH01564: unable to find IPv4 address
of "pc3"
AH00016: Configuration Failed
http://tieba.baidu.com/p/2523322219
