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So theres noway to get this "Dangerous" scan with Nessus ?
Nessus/Tenable has a mailing list dedicated to the product. I believe they also have support pages (support pages probably aren't freely available for the payware product, though).
Your Nessus (Win32 or *nix) client should have 'danger' options within its configuration.
I did not read the whole post but if you have had a lot of http processes then clearly it was not a syn flood, otherwise I think it would have stayed at kernel level ?
There are other attacks against TCP. Some are 8 years old and still working.
You need the full traffic log to know what happened.
At least, leave syncookies enabled.
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