Block nmap from scanning opened ports

[Altanop 0]

Hi i have eset endpoint security product and i would like to inform me how i can block nmal from scanning my webserver opened ports. 

Thanks 

[itman 1,659]

An decent router/gateway firewall will drop TCP sync packets on the WAN side.

[itman 1,659]

Also Eset IDS protection blocks port scanning by default:

[Altanop 0]

Ids has correct settings. But when i scan with nmap it appears this :

 

21/tcp   filtered ftp
22/tcp   filtered ssh
23/tcp   filtered telnet
80/tcp   open     http
110/tcp  filtered pop3
143/tcp  filtered imap
443/tcp  open     https
3389/tcp filtered ms-wbt-server

[Altanop 0]

On firewall settings ports 443 and 80 allow inbound for apache httpd