20,21: FTP. Note that ftp will use a "random high port number" if the client is in PORT mode, so you may need to add a port range into your /etc/proftpd.conf file to allow ftp connections, eg:
PassivePorts 32555 32565
and then open that port range as well in your firewall.
22: ssh access
25: smtp for exim to recieve email
53: dns (named), so your sites resolve
80, 443: apache traffic, http and https
110: client pop email access
143: clients imap email access
2222: DirectAdmin Access
3306: mysql acess. You don't need to open this port if you don't want to allow remote mysql access, as most mysql scripts are all accessed locally.
PassivePorts 32555 32565
and then open that port range as well in your firewall.
22: ssh access
25: smtp for exim to recieve email
53: dns (named), so your sites resolve
80, 443: apache traffic, http and https
110: client pop email access
143: clients imap email access
2222: DirectAdmin Access
3306: mysql acess. You don't need to open this port if you don't want to allow remote mysql access, as most mysql scripts are all accessed locally.
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