File transfer protocol (FTP) - 20/21, Secure file transfer protocol (SFTP) - 22, Secure shell (SSH) - 22’, Telnet - 23, Simple mail transfer protocol (SMTP) - 25, Domain name system (DNS) - 53, Dynamic host configuration protocol (DHCP) - 67/68, Trivial file transfer protocol (TFTP) - 69, Hypertext transfer protocol (HTTP) - 80, Network time protocol (NTP) - 123, Simple network management protocol (SNMP) - 161/162, Lightweight directory access protocol (LDAP) - 389, Hypertext transfer protocol secure (HTTPS) - 443, Server message block (SMB) - 445, Syslog - 514, Simple mail transfer protocol secure (SMTPS) - 587, Lightweight directory access protocol over SSL (LDAPS) - 636, Structured query language (SQL) server - 1433, Remote Desktop protocol (RDP) - 3389, Session initiation protocol (SIP) - 5060/5061,

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