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 views

I cannot connect to a port that is already open in my firewall

I have tried to open port 80 [root@rhel7 docker]# firewall-cmd --zone=public --add-port=80/tcp --permanent success [root@rhel7 docker]# firewall-cmd --reload success [root@rhel7 docker]# ...
0
votes
1answer
12 views

HP DesignJet hardening / close ports

I am trying to close unnecesary ports at our HP designjet plotter and I still have ports 280, 8086 and 8085 open. I have switched off everyting except raw print 9100 and these three ones are still ...
1
vote
2answers
28 views

how to see which process is using which port in windows 8

I am trying to start the Tomcat server at my pc by eclipse. But it is showing the following message Several ports (8005, 8080, 8009) required by Tomcat v8.0 Server at localhost are already in use. ...
1
vote
1answer
22 views

What are the default nmap options?

Which options are used by default, when the user fires # nmap target without any explicit option? I am going to write the defaults of the three options I consider the most important. It would be ...
0
votes
1answer
21 views

port visible but not accessable

I have port 80 open through my router, I have disabled my firewall, and canyouseeme.org sees port 80. yet I can not navigate to my IP address which is my web server. How can my port be visible yet I ...
0
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1answer
8 views

PID 4 Using Port 80 - IIS Unable To Bind

So I've been having a problem where I can't use localhost:80 on IIS So I ran this: > netstat -ano | find "0:80" And got: TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 ...
-2
votes
0answers
19 views

DMZ and Port Forwarding

If I place my laptop/host in the DMZ zone will I still need port forwarding? I noticed I'm still under the protection of my router's firewall. Practically, I'm still on NAT, my laptop's host is a ...
0
votes
1answer
22 views

Does port triggering from port 80 to port 80 make sense?

In troubleshooting a VoIP quality issue, tech support had me set up numerous port triggering ranges. One of the ranges was: Triggered Range: 80 to 80 Forwarded Range: 80 to 80 Based on my ...
3
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2answers
50 views

IPTables - Redirect traffic based on country

Is there any way how to allow TCP traffic only from specified countries on a specified port and the rest of traffic redirect to another IP/port using iptables ?
0
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0answers
15 views

Commonly open ports in restricted wifi networks

Which ports except for 80 and 443 are commonly not blocked in open wifi networks? I want to set up a OpenVPN Server on such a port to get around restricted networks. I have experienced the issue that ...
1
vote
1answer
27 views

Port not open but still able to download : how does it work?

When using p2p softwares such as a torrent client or emule I am unable to open ports even if I allow them in my firewall and forward them in the NAT configuration. Even after doing those two things ...
0
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0answers
17 views

given an on-borad port PCI address, how do I know to which NIC it belongs?

Assume we have a server with 2 on-board NICs (no other NIC was inserted to any of the free expansion slots). Given a PCI address of any of the ports of the on-board NICs above, is there a way to know ...
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0answers
47 views

What kind of ports are on this PCB? (Kangaroo Pocket PC)

| Overview Please refer to the teardown of the Kangaroo mini PC (below.) I am interested in finding out as much as I can about this board and the ports associated with it. Any details/specifications ...
1
vote
4answers
48 views

Multiple tabs of a browser

Since unique port numbers are assigned to each of the different processes related to network which are going on a system.So,my question is that,if multiple tabs are open in a browser then will ...
0
votes
1answer
44 views

Connection Refused on Host OSX 127.0.0.1:3000 for Vagrant/VirtualBox/nginx Rails App

The Rails application is running on port 3000: $ bundle exec rails server -b 0.0.0.0 => Booting Unicorn => Rails 3.2.21 application starting in development on http://0.0.0.0:3000 => Call ...
0
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0answers
21 views

How to monitor a port bandwidth?

How can I monitor a specific port's bandwidth? I'm using squid cache server, and I want to find out how much bandwidth is preserved. using soft wares like DU METER it's not possible to measure that. ...
0
votes
1answer
37 views

Can ONLY connect to ports http:80 and https:443?

I have a problem where I can only connect to the standard http port 80 and https port 443. I can access websites perfectly and play videos and all, but when I try to connect to IP's using other ports, ...
0
votes
1answer
47 views

What is this port on my 1999 laptop? [duplicate]

My Maxdata Artist Harvard SL Pro laptop, dating from 1999, has this port on its back side. I have never seen this anywhere else, neither can I identify the little icon to its side. The size of the ...
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0answers
52 views

Connecting a 2-pair Ethernet Cable to my Home Network

I have a IP video doorbell that connects using a 2-pair telephone line. I have managed to connect it to my DSL router (Linksys WAG320N) successfully and connection is working fine with live streaming ...
0
votes
1answer
19 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
vote
3answers
59 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
2answers
26 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
votes
1answer
17 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
24 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
30 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
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0answers
28 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 ...
0
votes
0answers
22 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
votes
1answer
12 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
29 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 ...
0
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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 ...
0
votes
2answers
40 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
0answers
96 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: ...
0
votes
1answer
44 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
15 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 ...
3
votes
1answer
90 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 ...
0
votes
1answer
25 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
22 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
1answer
29 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
65 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.
1
vote
1answer
59 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 ...
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 ...
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
40 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 ...
0
votes
0answers
64 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
0answers
33 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
45 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 ...
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0answers
35 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?
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votes
2answers
85 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
0answers
27 views

continuous Port Monitoring and logging in Linux VPS

Here I have faced a problem with my ISP. I have a Linux VPS , well configed for my company as a web and mail server. now I am facing the problem! Every time I send Emails from my server the Over ...
1
vote
1answer
20 views

Where do I start to troubleshoot this strange activity from my firewall?

I noticed that my firewall yesterday blocked outgoing attempts starting at port 61494 and worked its way up to 62381, making a TCP outgoing attempt at each port once. The remote IP address seems ...