Re: Nmap on VPS

[Shinnok <admin () shinnok com>]

Hi,

Nmap defaults to simple CONNECT scan if not run as root on a default
scan with no additional arguments.
If run with root privileges then nmap does a SYN scan[1], thus I would 
suspect
some firewall settings on your office network that mitigate the SYN scan.
Run nmap with the -v argument to get more detailed output.

Also look for the line:
Not shown: XXX filtered/closed ports.

Filtered would hint that yes, a firewall is in place and could 
potentially block
the SYN scan.

[1] http://nmap.org/book/man-port-scanning-techniques.html

On 6/23/2011 6:14 PM, Jo�o Daniel Neves wrote:
> Hello,
> I have a virtualized server (VPS). I use this server to host my blog. I have installed Nmap...But it looks like that 
> Nmap is not working proprety. When I scan my office (without root privileges), Nmap reports me some open ports. No 
> problem yet. But if I scan as root, Nmap say that allscaned ports are closed.
> I did the same kind of scan for both (priviliged e non priviliged)I scan a OPEN port with root privileges and Nmap port 
> report filtred.
> The truth is that some ports are really open.
> BTW: I did a normal installation: yum install nmap5.21.rpm
> Does anybody knows what is happening?                                   
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