Nmap Development mailing list archives
Re: Nmap SYN Scan blocks all connections?
From: Purely Pointless <purelypointless () gmail com>
Date: Mon, 19 Nov 2012 10:38:43 +0100
Thanks for the reply Patrick, I do have a firewall between these hosts however it's all on the same subnet so that shouldn't affect it, or? All other machines on the subnet are ok, It just appears the scanning machine locks itself somehow. Also, rebooting the machine itself "solves" the problem and the machine has network connectivity again. As for the scan this was just an example, as I use nmap on more advanced scans, I just tried to simplify it by specifying an -sS On Mon, Nov 19, 2012 at 10:21 AM, Patrick Donnelly <batrick () batbytes com>wrote:
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 _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://seclists.org/nmap-dev/
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Current thread:
- Nmap SYN Scan blocks all connections? Purely Pointless (Nov 19)
- Re: Nmap SYN Scan blocks all connections? Patrick Donnelly (Nov 19)
- Re: Nmap SYN Scan blocks all connections? Purely Pointless (Nov 19)
- Re: Nmap SYN Scan blocks all connections? Patrick Donnelly (Nov 19)