FTP
FTP
TCP
20, 21
SSH
SSH
TCP
22
SFTP
SFT
TCP
22
SCP
SCP
TCP
22
Telnet
Telnet
TCP
23
SMTP
SMTP
TCP
25
DNS Zone Transfer
DNS Zone Transfer
TCP
53
POP3`
PO3
TCP
110
IMAP4`
IMAP4
TCP
143
SNMP
SNMP
UDP
162
162
RDP
RDP
TCP
3389
LDAP
LDAP
TCP
389
LDAPS
LDAPS
TCP
636
TACAS+
TACAS+
TCP
49
Kerberos
Kerberos
UDP
88
TFTP
TFTP
UDP
69
RADIUS
RADIUS
UDP
1812
1813
FTPS
FTPS TCP 989 & 990 or 20 & 21
Secure POP3
Secure POP3
TCP
995
Secure IMAP
Secure IMAP
TCP
993