Recently, I have exprienced few times with my server -- if I open a page which execute many mysql queries, after few seconds, my site will shows up a blank page. EDITED: sorry, i was viewed under firefox, it shows up blanck, but with IE it shows with 403 page (forbidden) i meant everything will turn to a blank page - phpmyadmin, etc... Then, few seconds later after the script stops, it becomes normal again.
I have installed APF, BFD, mod security, Mod_dosevasive .....Could anyone of these caused the problem?
could it also because of the setting of my my.cnf?
it seems that everytime a page with many requests in a short of time, it will display the error page 403.shtml. I am thinking this is due to the mod security, but i am not really sure. Could anyone help me figure out what caused this?
i read somewhere on internet, and it mentioned that mod security will reject rapidly repeated requests.
I checked the audit_log for mod security and the last part was yesterday, and it showed someone's else IP...i had been testing with lots of requests tonight which included many queries being run...etc...
the log says:
Content-Type: text/html; charset=iso-8859-1
Request: xxx.xxx.xxx.xxx - - [23/Apr/2005:08:27:36 -0500] "POST /_vti_bin/_vti_aut/fp30reg.dll HTTP/1.1" 403 0
Error: File does not exist: /var/www/html/403.shtml
POST /_vti_bin/_vti_aut/fp30reg.dll HTTP/1.1
mod_security-message: Access denied with code 403. ap_setup_client_block failed with 400