When I run a nmap scan against a remote target, it shows port 25 closed but an online nmap tool like (https://hackertarget.com/nmap-online-port-scanner/) shows that port 25 is open.
sudo nmap -sS -v 194.95.6.16 -p 25 --reason
PORT STATE SERVICE REASON
25/tcp closed smtp reset
Which result is true and why the other one is displaying a different result?
PORT STATE SERVICE REASON
25/tcp closed smtp reset
TRACEROUTE (using port 80/tcp)
HOP RTT ADDRESS
1 61.28 ms 192.168.0.1
2 4.16 ms rsm4151x-ndr.net.hrz.tu-darmstadt.de (130.83.21.254)
3 14.89 ms corel506-rsm4151x.net.hrz.tu-darmstadt.de (130.83.253.74)
4 4.19 ms cores101-corel506.net.hrz.tu-darmstadt.de (130.83.99.33)
5 4.18 ms mx01-1.mpi-bremen.de (194.95.6.16)
I ran with traceroute option of nmap. How to find where is the firewall or IDS or even it's existing or not ?