[求助] 403 错误紧急求助

wpcp0510

网页以前挺正常，最近莫名其妙的出现403错误，提示如下：
Forbidden
You don't have permission to access / on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

遇到这种错误刷新页面偶尔会恢复，最终需要service httpd restart 重启下才能正常访问。
但是可能过10几个小时错误又会重新出现，重启httpd服务就好。

看日志有这种提示：
(24)Too many open files: /www/web/public_html/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable, referer:
根据百度搜索说要修改文件夹权限为755，但是查询文件夹权限没错。

请教是什么原因导致的？如何办？

wpcp0510

Google搜到一个：
http://greproot.com/htaccess-pcfg_openfile-unable-to-check-htaccess-file/

1) A simple restart of apache fixed it all of a sudden.

2) Try ulimit -a as root and  check for “open files”. The default value will be 1024. Try raising it to 4096 as follows.

ulimit -n 4096

3) Also, you can raise this limit for apache by giving it in apache startup script at the beginning.

vi /etc/rc.d/init.d/httpd

Enter the following line at the beginning of the script.
ulimit -n 65536

Save the file and restart apache

/etc/rc.d/init.d/httpd restart