Apache中proxy: ap_get_scoreboard_lb错误解决方法

工作中，通过apache配置了虚拟主机，但是在查看error_log的时候，发现总是有如下错误，似乎关于反向代理ProxyPassReverse的问题

[Wed Aug 28 16:55:26 2013] [error] proxy: ap_get_scoreboard_lb(4) failed in child 6690 for worker proxy:reverse

[Wed Aug 28 16:55:26 2013] [error] proxy: ap_get_scoreboard_lb(3) failed in child 6690 for worker ftp://zqftp:zq,[email protected]/
[Wed Aug 28 16:55:26 2013] [error] proxy: ap_get_scoreboard_lb(2) failed in child 6690 for worker http://127.0.0.1:8087/
[Wed Aug 28 16:55:26 2013] [error] proxy: ap_get_scoreboard_lb(1) failed in child 6690 for worker http://127.0.0.1:8088/
[Wed Aug 28 16:55:26 2013] [error] proxy: ap_get_scoreboard_lb(0) failed in child 6690 for worker http://127.0.0.1:8080/
解决办法：1./etc/init.d/apache stop

                  2./etc/init.d/apache start

此解决方法参考：http://www.zzorn.net/2009/11/setting-up-hudson-on-port-80-on-debian.html   Bill Dieter的留言

对于此解决方式我也很好奇，我service apache restart好几次都没有效果，总是清除不了这种错误，而error_log日志中定时报这种错误。似乎必须要采用上面的解决方法