During nmap scans we found several times responses that say port closed and port filtered.
PORT STATE SERVICE 22/tcp open ssh 443/tcp open https 1024/tcp filtered kdm 1084/tcp filtered ansoft-lm-2 1863/tcp filtered msnp 3128/tcp open squid-http 3333/tcp filtered dec-notes 4900/tcp filtered hfcs 9943/tcp filtered unknown 30000/tcp open unknown 38292/tcp filtered landesk-cba 40911/tcp filtered unknown 52673/tcp filtered unknown
If you get a response closed it means that the scanner is receiving a TCP reset packet.
If you do not get any response it means that the port is not available and thus changing the scan time that is required to fulfill the scan as the scanner needs to do more tests to make sure that there is no service available in the scanned port.
The best way to remove this information from your scan results is to use the option –open in the nmap. If we use it we will only get the results for open ports.