该死的技术，真不该做这行。该怎么解决

该死的技术，真不该做这行。
配个虚拟主机，但只有第一个生效。感觉也没错呀，一定是其实那个变量值没设对。该死的技术，快TM气吐血了。



 ServerAdmin webmaster@jicheke.com
  DocumentRoot "/var/www/sns/"
  ServerName www.a.com
  AddDefaultCharset UTF-8
  LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" common1
  ErrorLog "/var/httpd/log/jicheke-error_log"
  CustomLog "|/usr/sbin/rotatelogs /var/httpd/log/jicheke-access_%Y%m%d.log 86400" common1
 
  AllowOverride All
  Order Deny,Allow
  Deny from all
  Allow from all
  DirectoryIndex index.php index.html
 
  RewriteEngine On




 ServerAdmin jp214@126.com
 DocumentRoot "/var/www/jianping/"
  ServerName www.b.www
  AddDefaultCharset UTF-8
  LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" common1
  ErrorLog "/var/httpd/log/pingzi-error_log"
  CustomLog "|/usr/sbin/rotatelogs /var/httpd/log/pingzi-access_%Y%m%d.log 86400" common1
 
  AllowOverride All
  Order Deny,Allow
  Deny from all
  Allow from all
  DirectoryIndex index.php index.html
 
  RewriteEngine On


------解决方案--------------------
ping 不行的网址 看有解析到那台服务器上了没
没配置过 但

ServerName www.b.www 是随便个例子 还是？