Links

Initial access (protocols)

Theory

Practice

Well known ports

Common port
Protocol
Description
21/TCP
FTP
​
22/TCP
SSH
​
23/TCP
Telnet
​
53/UDP or 53/TCP
DNS
​
80/TCP
HTTP
​
88/TCP
Kerberos
​
389/TCP
LDAP
​
443/TCP
HTTPS
​
445/TCP
SMB
​
554/TCP
RTSP
​
1433/TCP
MSSQL
​
2049/TCP
NFS
​
3306/TCP
MySQL
​
3389/TCP
RDP
​
5585/TCP or 5586/TCP
WinRM
​