|21 Oct 2010||#1|
Common Virtual Ports
This article is about most common term in Networking World i.e., PORT/s. Most of us are aware of this term & need no introduction but i'll put few lines.
This article will define the Port & its purpose its a long list, there are 65535 ports in a computer, so, i'll be discussing only the common ports on most user's pc. Also note that i've added links for more reading if you really want to explore more about these ports.
Definition: In computer networking, the term port can refer to either physical or virtual connection points. Physical network ports allow connecting cables to computers, routers, modems and other peripheral devices. Several different types of physical ports available on computer network hardware include:
1) Ethernet port
2) USB port
3) Serial port
Whereas a virtual ports are a part of TCP/IP networking. These ports allow software applications to share hardware resources without interfering with each other. Computers and routers automatically manage network traffic traveling via their virtual ports.
Read more on: en.wikipedia.org/wiki/Computer_port_(software)
Here are some of the types of Ports on your/mine pc:
Purpose: File Transfer Protocol (Control Channel)
Description: File Transfer Protocol (FTP) is one of the oldest Internet protocols. FTP servers open their machine's port 21 and listen for incoming client connections. FTP clients connect to port 21 of remote FTP servers to initiate file transfer operations.
Purpose: SSH Remote Login Protocol
Description: The basic purpose of Port 22 is to contact SSH server. SSH stands for Secure Shell,is used primarily on Linux & Unix based systems to access shell accounts.
To read more about SSH refer to: Secure Shell - Wikipedia, the free encyclopedia
Description: Telnet is one of the earliest, original protocols of the Internet. A machine offering Telnet services is essentially offering to accept an "across the Internet" remote console terminal connection from any client device. This makes Telnet quite powerful and, without proper security, a significant security concern.
Description: SMTP is the protocol used to shuttle eMail across the Internet from one mail server to another. Over its years of use, the protocol has evolved significantly to become much more capable, and much less "simple" than it was in the beginning.
SMTP servers open and listen for incoming connections on port 25. Another SMTP server, or a personal eMail client, will connect to the server on its port 25 to transfer some eMail into it for subsequent forwarding toward its destination.
If you want to read more then check: Simple Mail Transfer Protocol - Wikipedia, the free encyclopedia
The specification of every nuance and detail of the SMTP protocol:
RFC2821 - Simple Mail Transfer Protocol
Purpose: Finger - User Information Protocol
Description: Finger servers provide information about the users of their computers by opening and listening for incoming TCP connections on port 79. Remote users wishing to obtain information about the user of a specific computer could do so by querying their machine's finger server listening on port 79. This information typically included the user's full name, address, telephone number, title, job name, office location, telephone extension, and so on.
Read more at: Finger protocol - Wikipedia, the free encyclopedia
Purpose: World Wide Web HTTP
Description: This is something we all have heard of & know about. This is the primary port used by the world wide web (www) system. Web servers open this port then listen for incoming connections from web browsers. Similarly, when a web browser is given a remote address (like grc.com or amazon.com), it assumes that a remote web server will be listening for connections on port 80 at that location.
Read more at: Hypertext Transfer Protocol - Wikipedia, the free encyclopedia
Purpose: Post Office Protocol - Version 3
Description: You can say that is similar to Port 25 i.e., SMTP port, but there is a little difference between the two.
Pop3 "post office protocol" is used by eMail clients for the retrieval of their eMail from designated eMail "post office" servers. Email Clients such as Microsoft Outlook, Netscape, Eudora, and many others, connect to port 110 of a remote eMail server, then use the pop3 protocol to retrieve their eMail. They first identify and authenticate themselves by logging on to the remote eMail server using their eMail account information. After doing so they are permitted to view and download their waiting eMail.
Read more at: http://en.wikipedia.org/wiki/POP3
Name: auth / ident
Purpose: Authentication Service / Identification Protocol
Description: Auth/Ident servers — which are supposed to run on the local user's machine — open port 113 and listen for incoming connections and queries from remote machines. These querying machines provide a local and remote "port pair" describing some other already-existing connection between the machines. The user's "ident" server is tasked with looking up and returning the connection's "USER ID" and perhaps additional information, such as an eMail address, full name, or whatever.
Read more at: Ident - Wikipedia, the free encyclopedia
Purpose: Network News Transfer Protocol
Description: Port 119 hosts the servers of the famous and infamous Internet USENET newsgroup world. NNTP servers push and pull news articles to and from other NNTP servers over port 119, and news reading (and writing) clients talking to news servers over the same port.
Read more at: Network News Transfer Protocol - Wikipedia, the free encyclopedia
Purpose: DCOM Service Control Manager
Description: Microsoft's DCOM (Distributed, i.e. networked, COM) Service Control Manager (also known as the RPC Endpoint Mapper) uses this port in a manner similar to SUN's UNIX use of port 111. The SCM server running on the user's computer opens port 135 and listens for incoming requests from clients wishing to locate the ports where DCOM services can be found on that machine.
A page of assorted DCOM info: Privacy Power! DCOM and SOAP
Purpose: NETBIOS Session Service
Description: TCP NetBIOS connections are made over this port, usually with Windows machines but also with any other system running Samba (SMB). These TCP connections form "NetBIOS sessions" to support connection oriented file sharing activities.
Read more at: NetBIOS - Wikipedia, the free encyclopedia
Purpose: Internet Message Access Protocol
Description: Imap protocol is used by eMail clients for the retrieval of their eMail from designated eMail "post office" servers. Email Clients such as Microsoft Outlook, Netscape, Eudora, and many others, using imap protocol to retrieve their eMail, connect to port 143 of a remote eMail server. They must then identify and authenticate themselves by logging on to the remote eMail server using their eMail account information. After doing so they are permitted to view and download their waiting eMail.
Point to note/remember that you never want port 143 opened to outer world.
Read more at: Internet Message Access Protocol - Wikipedia, the free encyclopedia
Purpose: Lightweight Directory Access Protocol
Description: LDAP (which is what people call it) is a modern and popular Internet directory access protocol used by many systems and services. Most Windows users will encounter it because Microsoft's NetMeeting uses and opens the LDAP port 389 while it is running.
Read more at: LDAP - Wikipedia, the free encyclopedia
Purpose: http protocol over TLS/SSL
Description: This port is used for secure web browser communication. Data transferred across such connections are highly resistant to eavesdropping and interception. Moreover, the identity of the remotely connected server can be verified with significant confidence. Web servers offering to accept and establish secure connections listen on this port for connections from web browsers desiring strong communication security.
Read more at: HTTP Secure - Wikipedia, the free encyclopedia
Purpose: Microsoft Directory Services
Description: This port replaces the notorious Windows NetBIOS trio (ports 137-139), for all versions of Windows after NT, as the preferred port for carrying Windows file sharing and numerous other services.
This article is not complete as i mentioned in the beginning there are more ports then mentioned here but these are some of the most common ports on a user's pc but will keep adding more common ports & if members & readers can suggest ports that they want/have come across that'll be appreciated.
Note: If you want to check what ports are on your PC & are they really closed or opened to Invaders then you can run a test on **Home of Gibson Research Corporation**. I did run a test & it helped me because two important ports were open & then i got it shield with the help of Comodo firewall.
Disclaimer: i'm not trying to advertise/endorse any software/website, just sharing information that helped me to be safe then before & want you to be safe as well. Trying the website & software is completely subject to an individuals decision.
|My System Specs|
|29 Apr 2011||#2|
searching for ports location in 7
Well, i know the ports properties but I was an Apple user and now I want to configure it on windows 7, could you explain me where I can find the folder to manipulates ports with their number, please?
And further, How to enter in the coding mode of 7?
Thank you so
|My System Specs|
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