Re: Nmap SYN Scan blocks all connections?

[Purely Pointless <purelypointless () gmail com>]

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/
_______________________________________________
Sent through the nmap-dev mailing list
http://cgi.insecure.org/mailman/listinfo/nmap-dev
Archived at http://seclists.org/nmap-dev/