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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3answers
51 views

My web server and web browser appear to be using port 80 at the same time

If I, on OS X, Start Firefox. Start Google Chrome. Start a Ruby on Rails server on port 80 (using RVM) rvmsudo rails -p 80 Use lsof to look at what is running on port 80 sudo lsof -i:80 Then I ...
0
votes
1answer
13 views

Using firewall-cmd to open up a port for INPUT only

I'm using firewall-cmd on centos7 to open up a port. But, I want to open up the port for INPUT only. I currently have this, but it, presumbably, opens it for INPUT and OUTPUT. sudo firewall-cmd ...
1
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2answers
13k views

Can't access my IP camera over the internet

EDIT: My problem is solved, please read comments 2-5 and 8,9. 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 ...
118
votes
1answer
204k views

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 ...
4
votes
4answers
17k 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
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0answers
15 views

How to monitor the incoming network traffic on android? [migrated]

I have an android device which is connected to the internet using mobile data (not wifi). How can I monitor 'pings' or 'hits' by some other device on my android phone? I have a friend somewhere, and ...
7
votes
4answers
44k views

USB Ports Not Working

None of the USB ports work anymore on my HP EliteBook 2540p laptop which is running Windows 7 Pro SP1. By "not working," I mean if I try plugging in a thumbdrive or external HDD it does nothing ...
0
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2answers
23 views

Things That Affect NIC Cards' Performance?

Folks, I have a laptop and a tower. And I use EtherCAT (through Ethernet port) on both. But I notice that if I unplug my cables on the tower, I loose a lot of frames, where as in the laptop I may not ...
0
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1answer
5k 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 ...
1
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4answers
6k views

How to remove IIS for WampSERVER?

I have WampServer installed, and I installed Microsoft SEO Toolkit, I guess that has the IIS dependency. And I guess the iis service uses port 80. Now every time I start WampServer, I need to go to ...
0
votes
1answer
14 views

Port forwarding service conflict with an existing port forwarding rule offering Any service

I am trying to add a port forwarding rule to my router that will allow a webcam and a 3d print server to run so that I can have remote administration. I am getting the following error service ...
0
votes
1answer
21 views

Cannot set ports to listening even though they have been opened Windows/Ubuntu

Currently trying to set up a connection (using sockets) between my localPC (windows) and my VM (Ubuntu). They are both on the same subnet and can be pinged. Went into Windows features, advanced ...
0
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1answer
24 views

How to safely open ports on home networks for testing purposes

I am trying to simulate a client/server scenario on my home network. To setup the socket connections, i require unused ports. For safety reasons these ports are closed. What criteria should be ...
0
votes
1answer
4k 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 ...
0
votes
0answers
16 views

Port forwarding in windows to device

Hi I'm trying to access remotely to the server of a device connected to Windows by Ethernet by port:80. I have already port forwarded that port to the PC and set the Firewall to allow access thru that ...
2
votes
3answers
4k 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 ...
0
votes
0answers
20 views

Create a printer USB port in Windows without a printer installer

I have an HP Laserjet 1020. I plug it into a Windows 7 Pro 32 bit Dell via USB. Under Devices and Printers, it shows up as a fully recognized USB device however it does not show up as a printer. I go ...
0
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1answer
9 views

Allow http request over specific port in iptables

I'm running Kodi with a web service for the remote control. The web server is listening to port 11734, however opening that port (UDP and TCP) doesn't seem to work. Once I accept all incoming traffic ...
-4
votes
1answer
27 views

Port forwarding is messed up

recently changed Hikvision Cube IP camera's (DS-2CD2412F) port and then after it does not work. I also changed the port forwarding in the router. It works only for 1 to 2 hrs, then it cannot be ...
4
votes
2answers
6k 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 ...
0
votes
0answers
15 views

TrendNet TEG-S16D port to Unifi AP freezes causing connectivity loss

I needed more ports so I upgraded from a TEG-S80DG to a TEG-S16D (unmanaged switch btw) and started encountering this problem. The port which is connected to a Unifi AP is "freezing" causing all ...
3
votes
1answer
14k views

socket.error: [Errno 10013] Port forbidden access permissions

When trying to use a Python script I get this error: socket.error: [Errno 10013] An attempt was made to access a socket in a way forbidden by its access permissions I put the post on ...
0
votes
2answers
36 views

How can I identify the command that spawned a process listening on a certain port?

I’m using the following version of Linux [davea@mydevbox ~]$ uname -a Linux mydevbox.mydomain.com 5.7.8-35.36.amzn1.x86_64 #1 SMP Wed Mar 16 17:15:34 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux I want ...
0
votes
2answers
3k views

Testing a Firewall against outgoing UDP ports

I'm trying to test which outgoing ports are allowed through a firewall. At the moment I can do this for TCP by port scanning portquiz.net (which is a server with all TCP ports open) from inside ...
0
votes
1answer
3k views

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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votes
2answers
65 views

Can't telnet to a Linux port

There is the following listener: telnet -na | grep 8000 tcp 0 0.0.0.0:8000 0.0.0.0:* LISTEN I can do telnet 1.2.3.4 8000 from the 1.2.3.4 server and it connects, but same command from ...
0
votes
1answer
41 views

Use two services/protocols on port 80

i ran into a problem today. I'am running a home webserver with FTP and everything and want also be able to connect to XBox live. The problem is (maybe some of you know) that Live uses port 80 (which ...
0
votes
0answers
51 views

Remote Login to Asus RT-AC87U Router

When I try to "remotely" login to my ASUS RT-AC87U Router, I'm getting below message and I'm not sure what to do? External IP: 17x.xxx.xxx.xxx Internal IP: 192.168.1.xx to login I use: ...
3
votes
1answer
72 views

Can't start IIS website on port 443, even though netstat shows nothing listening on 443

I have to bind my IIS website to port 443. No other port is allowed in my case. In IIS Manager I've bound Default Web Site to port 443: But when I try to start the website it fails with: However ...
58
votes
13answers
184k 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
0answers
12 views

How to change transmission-daemon port?

In /etc/transmission-daemon/settings.json I changed "rpc-port": 9091 to "rpc-port": 69, but since then I've been getting ERR_CONNECTION_REFUSED when I try to open website:69. Earlier, I was able to ...
0
votes
1answer
24 views

Trying to find out what's wrong with our external hard drive?

We have had the external hard drive since 2010 and we've had ongoing issues with it for the past 2 years. I'm hoping I can find out exactly what's wrong with it. Details: BUFFALO 500GB Hard Drive ...
1
vote
0answers
15 views

Mikrotik RouterOS FTP protocol routing

I have Routerboard 951Ui-2HnD and I am using it to merge/combine two internet lines wan1 and wan2 and it's working fine but I am facing a problem when I am trying to connect to any FTP server or ...
0
votes
0answers
53 views

How do I get my nginx server on the internet?

I have a personal website and it's very small, therefor I don't want to pay for it be hosted online. After a few days of research I decided to install vmware with linux ubuntu-server 14.04 with an ...
0
votes
1answer
26 views

Can two different applications bind the same port on a host if they use different protocols?

 my question is quite clear I think. If two applications use different transport layer protocols (e.g. TCP and UDP or something else) can they open the same port number? How does the OS do the ...
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votes
3answers
60 views

What exactly is a network socket? [closed]

I've heard a lot of different definitions online, and having trouble understanding what a socket is. It'd be great if someone could shine a light where it's all dark for me.
42
votes
4answers
6k views

Do web browsers use different outgoing ports for different tabs?

In a web browser that supports having multiple tabs, such as Firefox, do different tabs that go to different website domains use a dedicated port for each domain?. Or does the browser use a single ...
1
vote
1answer
50 views

Port forward Apache behind router and modem

I have a D-Link DSL-321B modem and an Asus RN-N12E_B1 router. The modem is connected directly with the internet. The router is the only device directly connected to the modem. My computer is ...
0
votes
0answers
22 views

Port not accessible

Am using AWS windows EC2 instance. I set the inbound rules in the machine to open all ports for public access. I installed IIS, and XAMPP in 8080 port. Now I could use 123.234.345.456 to open IIS and ...
0
votes
1answer
28 views

Cisco RV320 cannot portforward same port twice

I'm trying to port forward the port 34197 to 192.168.1.100 and 192.168.1.103 on my cisco rv320. Unfortunately in this router the ports are different services, and it won't let me add the same service ...
3
votes
0answers
3k views

How to close suspicious port 999 garcon, is it malware?

On Mac OSX, I ran the command nmap localhost and I found I have this suspicious open port: 999/tcp open garcon Then I tried to see if there is an associated process, but nothing shows up with ...
80
votes
8answers
246k views

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 ...
0
votes
2answers
1k views

Mystery port on my Samsung laptop (NP700Z5C)

What is the port in the picture of my Samsung Series 7 NP700Z5C? It's called a "Display Port" in this image (not from Samsung, admittedly), but it's clearly not (the Samsung documentation even ...
0
votes
1answer
2k 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, ...
1
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0answers
846 views

How to change dlink dir-524 router link port from 80 to 1088

How to change dlink dir-524 router link(192.168.0.1) port from 80 to 1088
2
votes
2answers
615 views

Netgear WNDR4500 listening on port 80

I have a Netgear WNDR4500 that I use for my home router. I also have my own domain with a subdomain point to my IP. I happened to browse to it today and noticed the management console was listening ...
0
votes
0answers
30 views

Teamviewer over SG300-52 52-Port without any others traffic

I have a VLAN1 IP 172.16.0.65, Subnet 255.255.255.244 and a VLAN2 IP 172.16.0.129, Subnet 255.255.255.244. I have set the switch to Layer 3. All I want is close all traffic between PC1 IP ...
0
votes
2answers
44 views

Apache installation errors “only one usage of each socket address <protocol/network address/port ”

I get an error message when I try to run httpd.exe. I have tried to resolve port conflicts - I uninstalled skypee, SQL Server Management studio and SQL Server Business Intelligence development ...
0
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0answers
33 views

Start router via RJ11 port and cable

What commands one need to send to a router, with the RJ11 cable in a RJ11 port to imitate a broadband connection?
4
votes
3answers
9k 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 ...