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Initial access (protocols)

Theory

Practice

Well known ports

Common portProtocolDescription
21/TCPFTP
22/TCPSSH
23/TCPTelnet
53/UDP or 53/TCPDNS
80/TCPHTTP
88/TCPKerberos
389/TCPLDAP
443/TCPHTTPS
445/TCPSMB
554/TCPRTSP
1433/TCPMSSQL
2049/TCPNFS
3306/TCPMySQL
3389/TCPRDP
5585/TCP or 5586/TCPWinRM