RE: Server blocks access of IP after nmap scan

[Dan Lynch <DLynch () placer ca gov>]

> so i guess after the nmap scan the server somehow 
> protected itself by blocking access to the site for my ip. I 
> would like to know what I can do in this case, how I can 
> successfully complete a nmap scan without putting it 'down'. 

First make sure this is within the acceptable use guidelines of your ISP and the server owner's ISP. If it's not, you'd 
best knock it off.

But if it is, there's likely an active IPS somewhere in your path to the server. Use nmap's timing options (either -T 
or -max-rate)to go "low-and-slow" and avoid triggering the IPS. You don't know what the IPS thresholds are set to, so 
be conservative, and be patient -- this will take a while.

An idle/zombie scan is inherently slower, but still subject to rate-based IPS alerts. You protect your real IP address 
from the target, but the zombie will get blocked if it triggers the IPS.


Dan Lynch, CISSP
Information Technology Analyst
County of Placer
Auburn, CA
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