I installed ispconfig 188.8.131.52 on debian Squeeze. I installed too Mod security, mod evasive and ddos deflate. I use the same configuration on 3 others servers and I have no problem.
With this last server when I upload a web site like concrete, it's working well but I have a error 403 when il would like to load 4 following pages quickly, when I load the fourth page I have a error 403. After I must wait for few seconds before loading another page otherwise I have the same error.
I checked mod security mod evasive because this error think me that it's a problem with these modules but I didn't found where is the problem and I have no errors in apache.
If you have any idea to help me please