Nmap on VPS

[Jo�o Daniel Neves <joaodanielnevesss () hotmail com>]

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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