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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Cannot open port 8080

I'm running a VmWare with an application under JBoss starting up on port 8080. I'm able to access the app from outside the VM if the iptables are off. However, I must turn on iptables due to some ...
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2answers
9k 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 ...
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1answer
19 views

Why won't apache bind to port 80 on Windows 10 upgrade

I just upgraded to windows 10 and now Apache won't start complaining that port 80 is in use. NetStat -a -b says that is can't figure out what process is using port 80 How do I find out and kill ...
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1answer
33 views

I accidentally opened a localhost port?

I had accidentally opened a port via firewall which had a WEBSITE(IIS EXPRESS) localhost port number. So could my desktop be hacked by opening a port? And also i had deleted it after a few minutes.
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894 views

How to Change SIP default port 5060

Port 5060 is blocked in our network, and I was wondering if it was possible to change it to 5222, which is a port used by Google Talk. If it is possible and I do change it, will I still be able to use ...
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2answers
61 views

Scanning my public IP address with Nmap finds TCP port 1720 open, is this a security concern?

When scanning my public ip address with Nmap I found out that I have open port on 1720/TCP. According Nmap service on it is H.323/Q.931. Researching uses of this port also brings up Microsoft ...
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1answer
8 views

How do I configure a TenGig2/1 as Gig Uplink on a Cisco 4900M ( Module: ws-x4908-10g-rj45 )?

Scenario: We were swapping out Module 2 on a Cisco 4900M from a 20-Port Gig to a 8-Port TenGig, a ws-x4908-10g-rj45 be precise. The hot swap went fine and TenGig2/1-8 sho ip int bri showed us the ...
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1answer
83 views

How to free a port on OS X when lsof(1) reports that it is not in use

I am a developer working in OS X on Eclipse. A bug I have been working to fix in a web application results in some very strange behavior when resetting an instance of Tomcat, resulting in the ...
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4answers
14k 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. ...
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2answers
70 views

How can I tell if ISP is blocking outgoing ports?

1st: How can I tell if ISP is blocking ports? 2nd: How can I tell if problem is related to OS? Problem began since upgrade to Windows 10. (Business computer, hence I don't know if I have ...
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117 views

Port 80 already in use after Windows 10 upgrade

I upgraded from Windows 7 to Windows 10 yesterday. I tried to launch EasyPHP and Apache didn't start because the port 80 is already used by System. I know that I can change the port used by Apache, ...
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1answer
23 views

How to permanently set port for localhost

Every couple weeks, the enterprise security software takes my localhost port for its scanning stuff, so I try to run an app I am developing in visual studio, and the IIS Express tells me the port is ...
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4answers
43k views

How to kill a particular tcp connection in windows?

On Linux we can kill an Established TCP Connection using tcpkill command. For example, to drop all connection to/from a particular IP: tcpkill host ipaddr Or similary to kill all connection ...
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0answers
10 views

Trouble configuring 2 IPs in single NIC and configure firewalld

I hope this is the place to ask. I just moved my server from Centos 6 to Centos 7. I read that Centos 7 is now using firewalld instead of iptables. Now my problem is I have only one card and I need ...
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1answer
48 views

telnet port 23 connection failed window 7

I'm using windows 7 and I'm trying to connect to my router with telnet: open cmd type telnet xxx.xxx.xxx.xxx. Result is could not open connection to the host, on port 23:connection failed. What ...
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1answer
4k 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 ...
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4answers
7k views

Can I connect a switch to a router?

Ok sorry if this is the most basic question in the world but for years I have needed more ethernet ports in my room and my whole house is wired with 1 ethernet port in each room, I also wanted to be ...
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3answers
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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 ...
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2answers
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iptables on CentOS 6.6

I'm trying to open a port on CentOS, but it doesn't seem to work: port 16 seems to be closed and 4075 seems to be open, even though according to iptables it should be visa versa. Chain INPUT (policy ...
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2answers
3k views

How to kill a process by port on MacOS, a la fuser -k 9000/tcp

On linux I can kill a process knowing only the port it is listening on using fuser -k 9000/tcp, how do I so the same on MacOS?
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1answer
16 views

SVC Host service not visible in Svchost viewer

Some port required by my application was put in TIME_WAIT status by svchost which I found by running netstat. I used this application called Svchost Viewer to track the PID corresponding to the ...
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1answer
52 views

Configure http port to 80 from 8080

Wildfly use port 8080 by default. How to change this to 80? So that I don't have to always add colon 8080? <socket-binding-group name="standard-sockets" default-interface="public" ...
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1answer
3k views

Firewall open ports for vSphere

I need to open ports on a firewall, so that a client could access his VM console through vCenter server's Web Client. I had a look at this page about port description, but I am a little confused. I ...
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7answers
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Test if a port on a remote system is reachable (without telnet)

In the old days, we used telnet to see if a port on a remote host was open: telnet hostname port would attempt to connect to any port on any host and give you access to the raw TCP stream. These ...
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36 views

How Can I Make Two (Or More) Usb Ports Act LIke One? [closed]

From what I understand, usb 3.0 storage devices have a higher data transfer rate (though it also depends on other factors), and that they're backwards-compatible with usb 2.0. However, when used in a ...
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11answers
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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 ...
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4answers
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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) ...
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1answer
19 views

DDoSing ports, do numbers matter?

I know people typically DDoS port 80, but let's say I DDoS any port besides 80, would surpassing the given port speed of any specified port still cripple someones network? Say I want to DDoS port 45, ...
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1answer
25 views

How do I change Synology DSM 5.0 http port via SSH?

I need to change port for HTTP from 5000 to 7777 on my Synology NAS via SSH. Is this possible?
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40 views

Why are all these email ports listening on a new Windows 8.1 install?

I recently did a fresh install of Windows on a formatted disk, upgrading from Windows 7 Pro to 8.1 Pro. Now I have installed a few things already, including: Embarcadero RAD Studio XE8 Microsoft ...
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0answers
20 views

Stop a reverse ssh tunneled port from listening on remote machine

I have a few devices that may get serviced through a server. Since the devices connect through a GPRS network with inbound connections blocked I make them check with the server every few minutes. The ...
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5answers
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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 ...
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34 views

Tcp connection target machine actively refused

I have a simple TCP client/server program on two laptops. The server should work fine as I use "netstat -anb" and the server shows up as listening, "0.0.0.0:102", then my client connection failed, ...
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2answers
57 views

Forwarded port 4433 to my PC's IP

On my router ASUS RT-N18U is port 4433 forwared to my PC's IP address. I've not done this and I don't know what does is mean. Should I be worried? EDIT: And also ports 60868 and 46153
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1answer
26 views

How to invoke Privoxy?

I have installed Privoxy on Windows 7 64-bit and by searching through it's docs I have found that i need to enter some command line arguments to install the Privoxy service. Now, where and how do I ...
2
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2answers
38 views

Port forwarding error on new router

I've recently gotten a new router to handle a 1GB internet connection (yes, 1GB) because my old router shouldn't be able to handle such a massive connection. But with it came a whole new lay-out and ...
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1answer
599 views

How i open a port (port forward) on this specific router

Here is a pic of how my router looks like I cant find where port forwarding is in this one. I know how to open ports on my other routers. Model: Home Station Fibra òptica Amper EG-663 Amper
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1answer
68 views

Can't Change SSH Daemon's Port Number under CentOS 7

I've upgraded my VPS to CentOS 7 from CentOS 6. Back when I was running CentOS 6, simply changing the port number of the SSH daemon under /etc/ssh/sshd_config used to make my remote SSH connection ...
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2answers
70 views

What is the 'Real' Definition of a PORT? Where are they installed?

I am confused the concept of a PORT in Networking. But am not clear with where do they exist? My Queries... Where do they reside? Can I change them? How does the ISP blocks a Port(I ...
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21 views

create tunnel in order to access https via port 443

I have Windows machine that connected to Linux server 192.9.100.10 And Linux server has connectivity to the IBM blade center management GUI - 192.9.100.200 From my Windows machine I do not have ...
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0answers
9 views

Preserve port information on redirect response ngnix

I have a service say service1 behind nginx with following configuration upstream service1 {     sticky path=/service1 expires=31536000;     server ...
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0answers
15 views

How can I find why a port is used in Ubuntu Server? [duplicate]

I recently installed Kamailio 4.0.4 on Ubuntu Server 14.04. After first run. 0(5400) ERROR: <core> [tcp_main.c:2932]: tcp_init(): ERROR: tcp_init: bind(a, 0x7fb5b0783344, 16) on 127.0.0.1:5060 ...
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2answers
37 views

2 Separate Machines, 2 Static IP Address. No connection Outside ISP Network

I have two separate physical machines. The first one is running CentOS 6.6 x86_64, and the second is running Ubuntu 14.04 LTS. (also 64-bit) Here's the issue. Both servers have a direct connection to ...
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0answers
29 views

USB Port not charging Galaxy S5 Tab

My Galaxy S5 Tablet will not charge through the USB port 2 0r 3 although it charges normally through the wall connection. How can I test the power output of a USB 3 port. My PC is a very high spec ...
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2answers
39 views

Allowing port access on Windows

I have a message broker running on my computer on port 1883. I tried to telnet that port (to test its accssibility) from a computer on the same network but that didn't work. How can I allow other ...
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2answers
33 views

Q: Is it possible to monitor SSH activity across local network (within organization)?

Is it possible to monitor SSH activity within the local network of the organization? Specifically is it possible to: View open SSH connections per user/machine along with the servers they are ...
2
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2answers
668 views

Can't use port 8080 - what is running on it? (OS X Mavericks)

I'm trying to run Tomcat on port 8080 using cargo, but it gives the message: org.codehaus.cargo.container.ContainerException: Port number 8080 (defined with the property cargo.servlet.port) is in ...
79
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2answers
163k 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?
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3answers
36 views

Port forwarding testing

In trying to check if I setup Port Forwarding correctly for my IP security camera none of the services report the port open. I can access the camera from within the LAN, but can't see it from the WAN. ...
2
votes
1answer
6k 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 ...