Someone tested my server and got it offline relatively easy.
I was not on good terms with him so he would not tell me how I could improve it.
I am far from an expert in servers so I would like some advice as of how to improve it as I intend to use it for the webhosting of my client's site's.
the url of one sites is http://nucleos.nl
running in php5.3 fpm.
You don't have to bother in writing tutorials, theres plenty of those here!