Open Ports

[Salam]

Hello Forum,
I'm a newbee and got a question about open ports. The ISPConfig Local Portscanner gives me this result:
Port 21 (tcp) is open (ftp)!
Port 22 (tcp) is open (ssh)!
Port 25 (tcp) is open (smtp)!
Port 53 (tcp) is open (domain)!
Port 80 (tcp) is open (http)!
Port 81 (tcp) is open (ISPConfig)!
Port 110 (tcp) is open (pop3)!
Port 111 (tcp) is open (sunrpc)!
Port 143 (tcp) is open (imap)!
Port 443 (tcp) is open (https)!
Port 630 (tcp) is open (rda)!
Port 631 (tcp) is open (ipp)!
Port 953 (tcp) is open (rndc)!
Port 993 (tcp) is open (imaps)!
Port 995 (tcp) is open (pop3s)!
Port 3306 (tcp) is open (mysql)!

The Firewall settings are:
Name Port Typ Aktiv
FTP 21 tcp ja
SSH 22 tcp ja
SMTP 25 tcp ja
DNS 53 tcp ja
DNS 53 udp ja
WWW 80 tcp ja
ISPConfig 81 tcp ja
POP3 110 tcp ja
SSL (www) 443 tcp ja
Webmin 10000 tcp ja

now where are all this open ports, beside the ones opened in the firewall come from and how to close what is not needed.
Thanks for any light on this issue.