nmap and port scanning reliability

[James Knott]

William Muriithi wrote:
> Hi pals,
> 
> A couple of weeks ago, I set up an application that uses port 1194. It
> worked well and then all of a sudden stopped working. I spent sometime
> looking at what went wrong and I could not find anything on the
> software side.

Port 1194?  Would that by chance be OpenVPN?  If so, you're likely using 
UDP, so you'll have to use a UDP port scan.  Also, be aware that UDP 
ports don't respond the same way as TCP.  A non responding UDP port 
appears exactly the same as one that quietly drops the packets.  If your 
firewall is configured in stealth mode, this is also what will happen.


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