A port provides a location for an application to interface with the network. If there is no application that is listening at a particular point, data sent there will never be used.

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1answer
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What is port forwarding and what is it used for?

There are a lot of questions on 'port forwarding' but there doesn't seem to be one that clearly states what it is and what it's used for. So: What is Port Forwarding? What is it used for, and why ...
61
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2answers
44k views

Finding the process that is using a certain port in Linux

I'd like to be able to find out which process is currently using a certain port in Linux. Is there any way to do this?
1
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2answers
7k views

Block all ports except SSH/HTTP in ipchains and iptables

How can I block all ports except ssh (port 22) httpd (port 80) using iptables and iphains?
12
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7answers
43k views

Apache Server on Windows 7 opening up ports?

I have installed Apache 2.2.14 on Windows 7 and can view my web pages using both http://localhost and http://127.0.0.1 but when I try to access the server from another computer on the same router, it ...
14
votes
4answers
53k views

PID:4 using Port 80

I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my Web Server it says: "Web Server Port: 80 Occupied". So I decided to check what ...
8
votes
3answers
16k views

Find out what program runs in the java.exe process

I have a problem: always when my computer starts, there is a java.exe process listening in the port 7676. I want to find out what it is to be able to delete it. Is there any way that I can find that ...
8
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4answers
23k views

How do I change RDP port on Windows 7?

How do I change the port that I use to remotely access a Windows 7 computer?
5
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6answers
2k views

Dos and/or Windows versions of Unix SCRIPT command

Back in university, when we had to submit an assignment in CS, we would have to perform a series of steps including running script, date, whoami, etc., and then running our program. The script ...
-1
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5answers
2k views

Why do I see router and not my real IIS?

I am trying to access IIS through web but unable to do so. Basically I have a router (which functions as router and modem) that is given by ISP and I have another router connected to the router given ...
6
votes
2answers
3k views

Why is there electricity flowing through my VGA and other ports?

I am using Windows 7 on a Sony VAIO laptop. When I connected my PC to the charger, I felt a little electric shock when I touched the VGA and other ports. I tested with a current detector and found ...
5
votes
3answers
22k views

How to know which port is busy or free on Windows 7? [duplicate]

Possible Duplicate: How can I see all active connections? I have some conflict of ports and my WampServer didn't work, so I have to know which port is used. Is there a command line command ...
3
votes
3answers
7k views

How to open ports on router for better torrent performance

I've been using utorrent to download and upload torrents for a long time. Recently someone told me that I need to open port(s) for utorrent from my router settings for better downloading and uploading ...
3
votes
1answer
551 views

What is the name of this laptop port?

Laptop is Acer TravelMate 331T.
1
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1answer
973 views

TCP/UDP ports that cannot be bound (permission error), but don't show up in netstat

When attempting to listen on certain TCP or UDP ports, I get weird error messages regarding permissions (or generic messages, depending on the program used to bind). The message in German is "Der ...
0
votes
6answers
470 views

iTunes ported for Linux?

Is there any ported version of iTunes for Linux? Really would like it; i need to restore my iPod. Emulation is slow because i have here a 1 GB of RAM.
58
votes
2answers
113k views

What are CLOSE_WAIT and TIME_WAIT states?

When I do netstat -a on my Windows machine, I get a listing of the ports with one of the four states: LISTENING CLOSE_WAIT TIME_WAIT ESTABLISHED What do CLOSE_WAIT and TIME_WAIT mean/indicate?
9
votes
2answers
8k views

No idea what is listening on port 80 in OS X

I'm on OSX Mountain Lion 10.8.3, and I've freshly rebooted my Mac. I want to start a service (like Apache on port 80), but there is already something going on with port 80: telnet localhost 80 ...
4
votes
1answer
8k views

Why does google chrome need so many ports open?

I just did a port check with CPorts and I find that google chrome has so many local ports open in the range of 7713 - 7794. They are all connects to 80 or 443 on the other end. Why does google ...
6
votes
1answer
582 views

268 Ports Associated with Chrome

I'm currently using a Windows box, running Chrome 27 on the dev channel, and I have what I believe to be an unusually large number of listening connections connected with the process. The following ...
2
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1answer
5k views

How to connect with Pidgin to Facebook-chat and Google Talk when XMPP port 5222 is blocked?

I have not been able to google this straightforwardly, so here it goes for others. Many networks have firewalls that block all but the basic ports. I am on one of them but I still want to acces gtalk ...
2
votes
1answer
5k views

How can I map a domain name to an IP address and port?

I want to give a domain name to the IP address and port for an application in Windows 7. For example, test.com should map to 127.0.0.1:59873. Is there anyway that we can do it by using a web server ...
7
votes
5answers
42k views

How do I find out what service is using a certain port?

Port 22 specifically. I installed freeSSHd on a windows server 2008 box that only runs IIS. When i try to start the SSH Service, it tells me that the port is already being used. How can I find out ...
5
votes
7answers
14k views

Utility to open TCP port to listen state

Is there some basic utility to open a specific network TCP port on my machine? I need to test how my program deals with ports on listening state..
3
votes
1answer
4k views

How can I effectively block torrenting?

My WNR1000v3 is serving six people and two of them have decided that despite my warnings they're going to torrent heavily all day. Not dealing with that crap I decided to reserve their IPs and set up ...
3
votes
2answers
422 views

Weird hits on port 2703

I'm getting these periodical console messages on my Mac: 7/22/11 8:01:03.925 AM Firewall: Stealth Mode connection attempt to UDP 10.0.0.1:2703 from 91.143.232.133:15881 7/22/11 8:01:05.885 AM ...
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0answers
319 views

USB hub assigning random com ports when Windows 7 PC or USB Hub are rebooted

I have four hardware devices that are plugged in through a self powered USB hub. Currently the devices are assigned COM1 COM2 COM3 COM4 through device manager as hoped. However, when rebooting the ...
1
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3answers
4k views

better tool than netstat

OS: Windows server/ Windows XP Is there any port scan tool that can do what netstat does and also has a filter feature, so that unnecessary connections can be hidden?
9
votes
4answers
2k views

What is ::: in the Local Address of netstat output?

This is the output of netstat -tulpn that I get: tcp 0 0 127.0.0.1:2208 0.0.0.0:* LISTEN 2055/hpiod tcp 0 0 127.0.0.1:631 ...
8
votes
6answers
5k views

Port scan revealed port 1111 open. What is it?

I am new to systems administration and have a new server running a website with http (at port 80), https (at port 443) and ssh (at port 22). I did an nmap port scan using my personal laptop and other ...
6
votes
4answers
6k views

Why is System listening on port 8000?

I noticed by accident today that I have some unknown webserver listening on port 8000. Opening http://localhost:8000 just returns 404, so I don’t get any hint what exactly is listening there. I’ve ...
5
votes
2answers
1k views

Will cases with front USB port support USB 3.0?

If a computer case has a USB port in the front, will it support USB 3.0 if my motherboard supports it? Or does the case vendor need to specifically mention USB 3 support? (BTW, I haven't seen such ...
4
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1answer
1k views

What is the purpose of ports?

I have a few questions in regard to the following explanation of ports I found. The Application layer talks to the Transport layer through a port. Ports are numbered and standard ...
3
votes
1answer
3k views

What is the difference between Port and Connector?

I want to know the difference between Port and Connector in Computer (the physical ones),and how can i tell that this thing is a port or connector ? I know that both terms are used for the same ...
3
votes
3answers
2k views

What is this port/connector on my laptop?

I have this port on my laptop and I have no idea what is it used for. It's not even listen in the laptop technical specifications. The laptop is a HP Pavillion dv5-1101en. Here is a larger image ...
3
votes
2answers
2k views

How can I plug my LPT printer into a motherboard with no parallel port?

I have a new computer with a Asus P5QL Pro motherboard and wanted to plug my old HP DeskJet 950C printer into it only to discover that the motherboard has no LPT/Parallel port. What is the best ...
2
votes
1answer
85 views

If my DSL modem leaves a port open, how vulnerable is my router?

Port scans of my old Netgear router showed that port 4567 was open. I assumed my router was to blame. Now port scans of my new Linksys router show the same open port, which makes me think my DSL modem ...
2
votes
0answers
2k views

Why do I see router and not my real IIS? [duplicate]

I am trying to access IIS through web but unable to do so. Basically I have a router (which functions as router and modem) that is given by ISP and I have another router connected to the router given ...
1
vote
2answers
2k views

SATA drive disappears every hour, back on hard reboot

I consistently lose one of my two SATA drives (one SSD, one HD) after (almost?) exactly one hour. Doesn't matter if the computer is at idle or the disk is being written to frequently. The machine is ...
1
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3answers
190 views

The physical aspect of networking ports

I stumbled across this article which, unlike any ambiguous article I've read, states that my "pencil-thin network cable (or wireless network adapter) at the back of your computer contains 65,536 ...
0
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5answers
1k views

Cannot Delete Unwanted COM ports - Windows 7

I recently installed a Cannon wireless printer for temporary use, the drivers of which set nearly all my COM ports to be constantly in-use (an occasionnal bug noted in the ReadMe after installation ...
0
votes
1answer
598 views

Does the Samsung NP700Z5A feature a Mini DisplayPort?

These are the specifications of the Samsung NP700Z5A: From these specs, here's a screenshot of one of the port sections: Does the 'Display Port' in this screenshot correspond to a 'Mini Display ...
0
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0answers
153 views

Port is listening, but owned by no one

Preface (skip for the real problem): I have an application that is listening to port 843. This process is run as root. Sometimes killing the process (with ^C) leaves it hanging for a long time ...
0
votes
1answer
710 views

Forwarding The Same Port To Multiple LAN Servers?

I would like to be able to use the Wake-On-LAN feature to be able to turn on the two computers attached to my router when i am out of the house using my WAN IP Address. Router = 81.210.109.0 PC A = ...
0
votes
1answer
210 views

What service uses UDP port 242?

What service uses UDP port 242? According to nmap, it says that the service or protocol named "direct" uses the port, but Google search does not seem to bring me an answer.
0
votes
2answers
415 views

Game server - How can I block connections from other countries?

I have a small server at home that I plan on putting a few game servers on, but I want to make sure only people from my country can join it. Is it possible to filter connection attempts to my server ...