Layer 7 help.

[Noisecontroller]

IIS is weak i think or are there other smart methods to mitigate these attacks?

Maybe this one?
Dynamic IP Restrictions
Link: Dynamic IP Restrictions : The Official Microsoft IIS Site

[Mental Retro]

Maybe this one?
Dynamic IP Restrictions
Link: Dynamic IP Restrictions : The Official Microsoft IIS Site

Already tried that does not seem to work or i have done something wrong, i use iis 7.5

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@Mental Retro you can simply order our free HTTP service, you do not need to customer of any paid service simply order point your A record to our protected address and we do the rest.

done!