ports

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Ports

Symptom: you have a server providing HTTP and FTP to the Internet users and the users are able to access the HTTP but not FTP.

Resolution: Run netstat -a command that will shows all active ports.

FTP: 21

Telnet: 23

SMTP: 25

HTTP: 80

POP: 110

HTTPS: 443

VPN: uses TCP Port 1723, IP Protocol 47 (GRE); L2TP: UDP Port 1701; IPSec: UDP 500, Pass protocol 50 and 51.

Terminal Services: uses TCP port 3389 for client connections