What port does SMB use? SMB has always been a network file sharing protocol. As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.
Why is port 445 blocked? Port 445 is associated with SMB (Service Message Block), an application layer network protocol that is mostly used for file sharing, printer sharing, and serial port sharing. Port 445 is vulnerable to security assaults, according to security researchers, and should be deactivated.
What port is SMTP? Port 25 is the original standard email SMTP port and the oldest, since it first debuted in 1982. Today, the Internet Assigned Numbers Authority (IANA), the group responsible for maintaining the internet addressing scheme, still recognizes port 25 as the standard, default SMTP port.
What port is FTP? FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port.