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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26
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8answers
79k views

Manually closing a port from commandline

I want to close an open port which is in listening mode between my client and server application. Is there any manual command line option in Linux to close a port ?? NOTE: I came to know that "only ...
0
votes
1answer
8 views

Xampp error, port 80 in use with PID 4 in virtualbox

I noticed there is a lot of information about port 80 errors with xampp, however, there is not much information about this error on virtualbox. On my main computer, xampp works perfect. On my ...
1
vote
1answer
4k views

How to use LAN1 port as second WAN port? (dir-615)

I have STB, internet connection with PPPoE and router D-link DIR-615 with dd-wrt. I want to STB ip will be assign from ISP directly. Or set up iptv something different. P.S. Router is D-link DIR-615 ...
1
vote
1answer
2k views

Port forwarding with IPTABLES and VBox

I have a small problem with getting a proper configuration of iptables under Ubuntu. But before, let me describe the network configuration: I am using xDSL line terminated with modem+router+DHCP ...
0
votes
1answer
17 views

Unable to connect to the MKS: Failed to connect to server xxx.xxx.xxx.xxx:902, the port is closed

I have a server with Vsphere ESXi 5.5. when i try to start a virtual machine with the vsphere client i get this error: Unable to connect to the MKS: Failed to connect to server 172.16.63.3:902 and ...
2
votes
1answer
3k views

How to Password Protect USB Ports?

Is there a way to Password Protect the USB Ports in Windows 8 so that every time a USB is inserted a prompt comes out asking for a password before it can be used on the PC ? Is this possible without ...
6
votes
6answers
8k views

WWAHost.exe using same port as Apache

I have installed XAMPP 1.8.1. on my Windows 8 64bit machine. I'm now facing a problem with ports. This is what I got from XAMPP Control Panel: 11:52:43 AM [Apache] Problem detected! 11:52:43 ...
-1
votes
1answer
416 views

How to make a QOTD server or similar

QOTD ("Quote of the Day") is a protocol that can be open on servers by default on port 17. I have googled and googled and for some reason there is pretty much no information on how to make a server, ...
0
votes
1answer
43 views

Reinstalled Windows 7 - Now cannot connect to any activation server or Microsoft Exchange

I reinstalled Windows 7 this morning, and now I am unable to connect to any activation servers for any Adobe software, and I cannot connect to Office 365 Microsoft Exchange server in Outlook 2013. ...
5
votes
7answers
60k views

How to “restart/repair” an USB port?

My laptop has two USB ports, but one is broken, so I use a USB hub in the other good USB port. In that USB hub, I use a mouse and keyboard. Suddenly, that USB port doesn't detect the mouse and the ...
0
votes
1answer
2k views

How to open a port for all users: NSA 2400

I'm trying to open up port 8332 for all users behind my firewall but can only find instructions for doing so for a single IP address. How do I make sure all my users can use a specific port? I've ...
0
votes
0answers
10 views

Windows Server 2008 IP porting

We have a Dell server running Windows Server 2008. This server has two NIC cards. One NIC is connected to a private network and the second is on a public. We need the ability to route the public IP ...
2
votes
2answers
2k views

iptables firewall only allows internet traffic if source port of 80 is allowed

I am configuring an iptables firewall, currently just to allow http and https traffic. It is working but under a particularly strange rule - I must allow incoming connections with a source port of ...
3
votes
4answers
9k views

Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...
0
votes
1answer
3k views

Can't access my IP camera over the internet

I have an EasyN F3 (F3-M166) IP camera. It works fine on local IP address, but I can't access it over internet. This is what I have done step by step: I configured the local IP (camera_ip) and port ...
0
votes
1answer
25 views

How can I check which ports are in use from the Linux command line? [duplicate]

I'm running a Node.JS application and need to figure out if something is using a certain port. How can I do this from the linux command line?
0
votes
1answer
26 views

Port forwarding does not work

I am connecting to office network through VPN. I have two servers A and B. I have ssh/tomcat access to A through VPN but not to B. When I ssh into A, from there I can ssh into B. Also, B is running ...
1
vote
2answers
2k views

Forwarded port 80 to VM using VirtualBox, how do I open access to network?

I forwarded port 80 to my Ubuntu Server VM, and the website is very much accessible locally. How do I allow incoming port 80 connection to Windows 7 (so it will be forwarded to the Ubuntu Server)?
0
votes
0answers
47 views

Port forwarding on a Huawei EchoLife HG8245

The problem is port forwarding in my EchoLife HG8245 router. I am able to port forward, and I know it works. But after some time I've came with the conclusion that my router only accepts 1 connection ...
0
votes
1answer
36 views

Opening a port on CentOS server not working externally?

I am trying to to setup a Ghost blog instance on port 80 of my CentOS 6 virtual server. There are no pre-installed web servers occupying port 80. If I run Ghost in production mode as a background ...
0
votes
1answer
15 views

PID not shown under Services in the Task Manager on Windows 8

I'm trying to run a program that defaults to port 9000 but there is an unknown source using that port. I found the PID by using, netstat -aon | more and went to the task managers service tab ...
2
votes
3answers
189 views

Which Powershell Function could check whether a certain port is in LISTENING state on localhost?

Introduction Aim: to check whether a port is in LISTENING state on localhost by using a PowerShell function The following command: New-Object Net.Sockets.TcpClient.Connect("127.0.0.1",10389) ...
0
votes
5answers
366 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 ...
-1
votes
0answers
35 views

System blocks port 80, how to release it?

I need to use port 80 on my Apache server, but it is used by PID 4, which is (on my computer) the process System. How can I release this port?
1
vote
3answers
9k views

How to enable or disable usb ports on windows vista pc?

I want to ask how can we enable or disable usb ports on windows vista pc. Also i have 6 usb ports , 2 in front and 4 at the back, so it it possible to disable the front usb port and enable 4 ports at ...
0
votes
0answers
19 views

Failed PCI DSS Compliance [migrated]

I got this from my compliance check results. To me it looks like my router is responding to their test but I'm not sure where to go . ( might be off track completely though) Description: PCI DSS ...
0
votes
1answer
41 views

After recover sshd_config on my VPS my TeamSpeak 3 client can't connect with server

I'm destroy my default sshd_config file in /etc/ssh/ on my VPS and I'm recover this to default one. After this I'm trying to connect with my TS3 server on this same VPS. OS says me TS is ON and ...
5
votes
3answers
30k views

How can I check which ports are busy and which ports are free on my Linux machine?

Is there any command line command or any other way to find and list out the busy and free port numbers on my Linux machine?
0
votes
1answer
29 views

Test connection to a port without actually connecting to it

I have a python socket server (single-threaded, accepts only one connection) running somewhere. I connect to that port and do my things. How can I detect whether port is open or closed without ...
3
votes
2answers
144 views

How to list all hosting services on Windows 7?

I cannot host on port 80, because there is an application on the background, which hosts on port 80. How do I find out which program it is?
1
vote
2answers
2k views

How to access NodeJS server on LAN?

I'm not the most knowledgeable guy ever with networking, but here goes... I've created an application with NodeJS and I'd like to test the application on my LAN with my family. The application ...
0
votes
1answer
72 views

Netcat error: Can't grab 0.0.0.0:80 with bind

When I tried to listen on port 80 in Windows 7 with netcat, I get this error: C:\Users\sashoalm>echo "hello, world" | netcat.exe -l -p 80 Can't grab 0.0.0.0:80 with bind On the other hand, ...
0
votes
0answers
16 views

Bad Results from Port Check Sites

I'm not a network expert, though I know how to set up a static IP and forward ports. I've always wondered how port checking sites like http://ping.eu/port-chk/ work, because whenever I try them on ...
1
vote
3answers
94 views

How to block all ports except 80,443 with iptables? [duplicate]

Blocking all ports(in and out) is easy but it's hard with the word "except". I don't know any rules that satisfies the condition. PS: I know this question is nothing new. But in fact, I didn't find ...
0
votes
0answers
18 views

'fail to add torrent' error nexus 5

Trying to use torrent download on nexus 5 modded rom slimkat 4.4. Keep getting error ~ 'falied to add torrent from source target'. Tried using utorrent and ttorrent-lite, and have not had any success. ...
0
votes
0answers
19 views

USB port cut on

I need to use my computer to charge several items. If I leave my computer for any length of time it shuts down Of course the things charging stop the charging process and I have t cut my system back ...
0
votes
0answers
27 views

Port forwarding on Parallel Desktop

My situation is like this. I have a Windows 7 VM run by Parallel Desktop, on which I run ASP.NET on localhost:1240 (Visual Studio development server). Is it possible from my host machine (OSX 10.9) to ...
0
votes
1answer
45 views

Why can I not connect to a reverse SSH tunnel port remotely, even with GatewayPorts enabled?

I require constant SSH access to a host in our department, whose IP address is dynamically allocated. I've set up a remote SSH tunnel from the target host to one of our hosts that does posess a static ...
1
vote
2answers
879 views

I have 2 computers with Linux, how can I send with ftp files from computer1 to computer2 (shell command)?

I have 2 computers with Linux. How can I send with ftp files from computer1 to computer2 them (shell command)? Steps that I think should be done (miss shell commands): Find inner IP address of ...
0
votes
2answers
29 views

Port Forwarding a Specific Port (e.g. 22)

I'm still confused about establishing an SSH connection (port 22) between two computers on different internal networks. For example: I am on my computer with internal IP address IIP-1, connected to ...
1
vote
0answers
81 views

Installing and running two postgresql versions on different ports (or two instances of same server)

I have postgresql 9.1 installed on my machine (Ubuntu). I need another postgresql server that would run next to the old one. Exact version does not matter, but I'm thinking of using 9.2 version. How ...
0
votes
0answers
53 views

UDP port binding to loopback interface

I've been trying to play a video game in multiplayer, but after trying a lot of time, I begun to realize there was some problem with my loopback interface (Windows 7) I have UPnP activated in my ...
0
votes
1answer
74 views

Ubuntu + SSL ports + AVAST

I have an interesting problem with communication via standard SSL ports. Fresh installed Ubuntu 14.04 server + Postfix + Dovecot, SASL authentication provided by Dovecot, self-signed certificate ...
0
votes
1answer
401 views

How to forward blocked ports by ISP

So I've been trying to setup a TeamSpeak 3 server on my pc but ports (9987,10011,30033) are blocked by my ISP, I've contacted them to unblock them but they didn't accept, and it's the fastest ISP in ...
1
vote
0answers
37 views

Can't connect to a game over remote LAN

First of all I want to say that I'm not entirely sure if this question can be asked here. If it can't, then please tell me and I will delete it. There's this game called Killing Floor, which can be ...
1
vote
1answer
58 views

Where to place a port-mirroring switch for home network monitoring

I want to start monitoring traffic that goes in and out of my home network. I'd like to collect information like bandwidth usage and (specifically) HTTP requests from home computers to websites. From ...
2
votes
0answers
40 views

how does the software firewall affect the hardware network card?

I am waking my computer up by sending magic packets. But if I close UDP port 9 from windows firewall, my computers is not booting. And also, the lights on ethernet port are off. It looks little too ...
2
votes
1answer
67 views

Use of ephemeral port for server

In general ephemeral ports are used by clients when establishing connection with the server. For example: Server listens on port 80 A client (browser, FTP client, bittorent client) send a request ...
0
votes
0answers
46 views

How to find which port a service is using by “grep” the result of netstat output on windows 7?

i want to find which port a service is using. i know i can use netstat -anb to show all the protocols and all applications. but how can i filter the result, eg. if the program i'm trying to ...
2
votes
3answers
551 views

net use and Windows 8.1

I have a script that in run by some application. The script adds a shared printer to lpt1 port, then sends a file to it so it get printed then removes the printer from the port: Everything works fine ...