Nmap Development mailing list archives

Re: Nmap SYN Scan blocks all connections?


From: Patrick Donnelly <batrick () batbytes com>
Date: Mon, 19 Nov 2012 04:21:08 -0500

On Mon, Nov 19, 2012 at 4:10 AM, Purely Pointless
<purelypointless () gmail com> wrote:
Any pointers would be appreciated.

Sounds like you have a firewall or the like in front of the scanning
machine that is overloaded by tracking too many half-open [1]
connections.

It sounds like you're doing normal, regular network reconnaissance in
which case -sT is probably preferred.

[1] http://en.wikipedia.org/wiki/Port_scanner#SYN_scanning
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