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
22 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 ...
0
votes
0answers
21 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
16 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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3answers
54 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
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 ...
0
votes
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
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
22 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
votes
1answer
26 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
17 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
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
votes
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 ...
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 ...
0
votes
2answers
38 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
60 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
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
13 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
74 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
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
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 ...
-4
votes
3answers
62 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
51 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
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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
31 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
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
0answers
31 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?
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votes
2answers
66 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
26 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
18 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 ...
0
votes
1answer
35 views

How to protect a port from attackers

I want to host a home server(i.e a minecraft one) which runs on port 25565. Is there a way to protect my home internet from attacks while this port is open? Or I should select an more unusual port? ...
0
votes
0answers
20 views

TCP and UDP do not work with firewall

I can not connect my TCP-Client to my TCP-Server. Here is my Code: http://stackoverflow.com/questions/35661591/tcp-server-does-not-work-with-firewall I have already opened my TCP-Port "8888" in the ...
0
votes
1answer
72 views

Can't port forward on my static public IP with my TD-W9980 router

I believe I have set up my port forwarding correctly. Router setup page. TPG (my internet provider) said port forwarding is possible with them and they don't block any ports. Multiple port checkers ...
1
vote
1answer
29 views

Are different port numbers assigned for different tabs opened in a browser

I want to know if different port numbers are assigned to different tabs opened in a browser. Since on a network every tab inside a browser is running a different process,there must be some way to ...
0
votes
1answer
42 views

Why does my browser hang when I visit google.com:8000, but error at google.com:443?

I'm learning about ports and was mucking around. I found out that when I visit http://google.com:8000 (a port I chose at random), my browser times out after hanging for a while. But when I visit ...
-3
votes
1answer
21 views

How are Ports Used and Represented in an Operating System? [closed]

How do ports exist in an operating system? Is there some file for every port that exists? And how are the ports then used? Is data in some form directed to be sent to a specific port? I do not ...
0
votes
2answers
30 views

random open ports on nmap scan

My machine has the IP address 192.168.1.50 . When i do the following nmap scan nmap -p- -sT -Pn 192.168.1.50 from the same machine, i get at each scan some random open ports. And these random open ...
0
votes
1answer
135 views

Windows Command to check if a remote server port is opened?

I have two Windows Servers.. Server A and Server B. There is a service configured on Server A to listen on port P. Is there a way to check if the port is opened in Windows Server B irrespective of ...
1
vote
0answers
23 views

bsd (osx) pf nat - change source port on outgoing UDP packets

I am running docker-machine on osx. docker-machine is running NAT so when my container send out a UDP packet on port 1812, NAT is translating it to some random port. I am playing around with pf nat ...
0
votes
0answers
25 views

UDP port 9987 wont open on my firewall

I have a zywall-usg-200 and i have tried to open ports, i managed to open two TCP ports but the UDP port 9987 fails, cant connect to it. Does anyone have the same problem? Or is it just my firewall
0
votes
1answer
56 views

I am not able to connect my software with my public IP

please help me in port forwarding. i m stuck in the middle. suppose my local ip is - 192.168.0.103 and public ip is - 49.248.xx.xxx I have D-link DSL-2520U ADSL2+ modem router so here is what i do, i ...
0
votes
0answers
80 views

Cannot Connect to server

I'm developing an application, and I need to connect to the server by app through port 5222 (TCP). My host doesn't have a domain name (just an IP address). In my local network I can simply connect to ...
0
votes
0answers
22 views

I don't know what kind of port this is [duplicate]

I wanted to find out what the port next to the USB port is called. I don't know the full specification on my laptop but it is a Dell XPS laptop.!
0
votes
0answers
2 views

Can I tell zenmap to apply a command to all known hosts?

In zenmap (an nmap gui), you can apply various scans, and it remembers the results, keeping a list of hosts you have successfully scanned. Can you tell it to apply a command against all known hosts ...
0
votes
1answer
76 views

NMAP Always says host is down (when using -Pn it says ports filtered)

I am running Kali 2.0 (Kali sana) and I have problem with NMAP, it everytime says that host is down when i scan it (even myself with firewall off)... When I try online nmap ...
0
votes
1answer
142 views

Suspicious activity on antivirus detecting port scans

Within 3 hours Bitdefender blocked 4 port scans of different IPs and Countries...I don't know what's happening. Can anyone suggest me what's going on? These are the IPs blocked! 197.89.232.231 ...