Ports restricted for security purposes when working on the Internet

smtp 25 tcp - prevention of spam distribution (opened upon subscriber request)

microsoft-ds 445 tcp - protection against vulnerabilities in Microsoft Windows

TFTP 69 tcp/udp - protection of subscriber routers

Samba Web Administration Tool (SWAT) 901 tcp - Closed to prevent access to Samba settings through the web

Microsoft SSDP Enables discovery of UPnP (Universal Plug and Play) devices 1900 udp - The easiest way to gain unauthorized access to a computer!

3332 tcp/udp - protection against Trojan programs.

5554 and 9996 - Protection against viruses such as "Lovesan," "Lovsan," "Blaster," "Msblast," "Poza."