The 'standard' ports for services you may wish to open in your firewall are...
- FTP | Port 21
 - SSH | Port 22
 - TELNET | Port 23
 - SMTP | Port 25
 - WEB | Port 80
 - POP3 | Port 110
 - IMAP | Port 143
 - HTTPS | Port 443
 - MySQL | Port 3306
 - DNS | Port 53
 - DHCP | Port 58
 - TFTP | Port 69
 - SNMP | Port 161
 - LDAP | Port 389
 - RSync | Port 873
 
