Tcp/ip port to download files from a server

Most modern systems will have port 23 closed and the telnet service disabled to prevent its use. SSH should be used in place of Telnet. SMTP is a very simple protocol and requires that the mail service always be available at the receiving host. Typically the receiving host will store incoming messages in a spool for subsequent access by the recipient using the POP3 or IMAP protocols.

It has a reduced command-set and lacks authentication. This results in extremely fast transfer speeds but, consequently, lacks data reliability. TFTP is typically used in network based booting for diskless workstations.

Essentially it defines the command and control mechanism between the browser and server defining client requests and server responses. In most corporate environments incoming email is stored on an email server and then downloaded to an email client running on the user's desktop or laptop when the user checks email.

POP3 downloads all new messages to the client, and does not provide the user the option of choosing which messages to download, view headers, or download only parts of messages. Using this protocol an operating system or application can request the current time from a remote NTP server. Podcast what if you could invest in your favorite developer? Who owns this outage? Building intelligent escalation chains for modern SRE. Featured on Meta.

Now live: A fully responsive profile. Reducing the weight of our footer. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. EventArgs Handles btnSend. Text ' Alocate memory space for the file ReDim filebuffer fileStream. Length fileStream. Read filebuffer, 0, fileStream. GetStream networkStream. Write filebuffer, 0, fileStream.

Length end sub. ByVal e As System. Dim filebuffer As Byte. Dim fileStream As Stream. ReDim filebuffer fileStream. Read filebuffer , 0 , fileStream.

Text , Dim networkStream As NetworkStream. Write filebuffer , 0 , fileStream. Threading; using System. Net; using System. Sockets; using System. Text; using System. Threading ;. Net ;. Sockets ;. Threading imports System. Net imports System. Sockets imports System. Text imports System. Public Class Form1 Inherits System. Form private nSockets as ArrayList. GetHostByName Dns. GetHostName ; lblStatus. GetHostName ;. AddressList [ 0 ]. ToString ;. Start ;. EventArgs Handles MyBase. GetHostName lblStatus.

AddressList 0. Start End Sub. AddressOf listenerThread. End Sub. AcceptSocket ; if handlerSocket. Add handlerSocket. AcceptSocket ;. Add handlerSocket ;. ThreadStart handlerThread ;. AcceptSocket if handlerSocket. Connected then lbConnections. Start end if Loop End sub. Public sub listenerThread. Dim tcpListener as new TcpListener Dim handlerSocket as Socket.

Dim thdstHandler as ThreadStart. Dim thdHandler as Thread. Connected then. Learn more. Ask Question. Asked 5 years, 1 month ago. Active 2 years, 9 months ago. Viewed 3k times. R Adil. R 1 1 gold badge 5 5 silver badges 18 18 bronze badges.

Just initialize the totalRecv to 0 — MikeL. Add a comment. Active Oldest Votes. That worked!