ISPConfig needed Ports

TCP ports

20 - FTP Data
21 - FTP Command
22 - SSH
25 - Email
53 - DNS/Bind
80 - HTTP (Webserver)
110 - POP3 (Email)
143 - Imap (Email)
443 - HTTPS (Secure webserver)
465 - SMTP over SSL
587 - Email Submission
993 - IMAPS (Secure Imap)
995 - POP3S (Secure POPĀ§)
3306 - MySQL Database server
8080 - ISPConfig web interface
8081 - ISPConfig apps vhost

 

UDP ports

53 - DNS
3306 - MySQL

 


Source:
- ISPConfic Which ports are used on a ISPConfig 3 server and shall be open in the firewall? 
- Wikipedia List of TCP and UDP port numbers
- wikipedia Liste der standardisierten Ports