Questions tagged [port]

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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can i passthrough data from port 9001 to port 443 and viceversa?

im trying to connect my nas to the network. the problem is that i choose to create my nas with nextcloud running on Trunenas Scale running on Proxmox. the truenas-proxmox part is fine, each one has ...
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Port forwarding between Host and QEMU VM

I am accessing a host using a SSH over a VPN. That host have a VM on QEMU which I deploy using virt-manager. The host and VM are able to communicate. The VM have a Apache Webserver running. I am able ...
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1 answer
5k 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 ...
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1 answer
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Trouble printing over the internet through router to private network

I am trying to send a print job from anywhere to a home network via its public IP address (I tried with and without a port number added ex. 40.230.2.2:9100), normal port number for RAW being 9100. I ...
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Unable to connect to VPS via ssh on any other port than 22. Connection timed out error

For security reasons I changed the port for an ssh login to a different port number. But as soon as I do and try to reconnect, I get a 'Connection timed out error'. Once I switch back to port 22 it ...
14 votes
1 answer
20k views

Multiple processes listening on the same port; how is it possible?

Multiple processes are listening on same port. But as far as I know only one process can listen on a port. Is it possible (how?) that multiple processes can listen on same port? $ sudo lsof -n -i :80 ...
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1 answer
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What Is the TELNET User and Password for the Y4C-ZA security camera

I bought a Y4C-ZA security camera recently, I scanned all the open ports on it, and found there was a telnet port open: port 23, does anyone know what the telnet credentials would be, also, the ...
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1 answer
5k 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 ...
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Is there a way to capture an dns name and port petition done by an app and redirect it to another needed ones? [duplicate]

I have a Windows app that is client of HFSQL server, programmed in WinDEV. The app has the dns name and port number petition hardcoded in the .exe file. I need to 'capture' that dns name and port and ...
1 vote
1 answer
4k views

Opening port 3000 EC2 Amazon web services

I am trying to use nodejs and socket.io to deliver a webapp, which use websocket on port 3000. I have opened port 3000 on my EC2 instance in my management console by adding the inbound TCP rule to ...
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1 answer
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netstat shows listening on some ports but nmap shows none

Please help me figure out why the destination host shows processes listening on some ports: But source host sees all ignored? What exactly am I missing?
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4 answers
6k views

Localhost is forbidden when using LAN IP address instead of 'localhost'

I'm trying to access my localhost from my Android tablet, but I'm having problems. I'm using WAMP server and configured the httpd.config file, and port forwarded 80, but I still can't access localhost ...
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1 answer
4k views

Why does my router have an HTTP server on port 5555?

I just did a port scan using nmap on my router (a Netgear WNDR3700) from the LAN side and found these ports to be open: PORT STATE SERVICE 23/tcp open telnet 53/tcp open domain 80/tcp ...
6 votes
1 answer
105 views

Mystery "it works" message on port 8080 - no web server installed

I'm running Arch. I don't have Apache or any other web server installed. Accessing localhost:8080, I get a plaintext response: it works No HTML, nothing. I don't know what process is serving this. ...
19 votes
11 answers
263k 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 ...
2 votes
5 answers
1k views

Can access port on public IP but not private

I have a PC running a web server on port 8080, and SSHd running on port 22. In my router settings, I have forwarded port 8080 to 80, and set up an ANAME record on my domain pointing to the public IP. ...
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3 answers
5k views

Port Forwarding for RDP

I'm trying to setup Remote Desktop on my computer. It's currently running Windows 7. RDP is set to allow for incoming connections. I've followed the instructions at PortForward.com, but am having no ...
1 vote
1 answer
5k views

Find the com port of a specific device on command prompt

I know we can find it out from the device Manager under ports. But I want to be able to get this info on command line so I can incorporate it in my python script. I looked at tools like WMI, Devcon. ...
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1 answer
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git clone Error: ssh_exchange_identification: Connection closed by remote host

gitlab9.3.9 upgrade to 11.9, git pull OR git clone don't work My surroundings: docker-compose.yaml web: image: 'gitlab-ce:11.9.1-ce.0' container_name: gitlab_web restart: always ...
68 votes
5 answers
63k 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 ...
6 votes
4 answers
14k views

Can’t get Nginx to work on port 80. Works fine on any other port

I’ve just setup Homebrew’s Nginx on Mac OS X 10.11 (El Capitan). If I set my Ngnix config like this: listen 127.0.0.1:8080; listen 127.0.0.1:81; listen 127.0.0.1:75; It’ll work. ...
1 vote
1 answer
5k views

Which ports need to be allowed through firewall to seed torrent using transmission-cli on headless server?

Self-hosting my own tracker using bittorrent-tracker. Opened UDP port 6969 on tracker and seed servers. What else needs to be allowed?
0 votes
1 answer
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I cant start apache with my Public IP address in Listen Configuration

I am currently using AWS Ec2 ubuntu (20.04) instance. I have installed apache2 and configuring the Listen directive for apache. But, i cant give the public IP address of my Ec2 instance in "...
0 votes
1 answer
583 views

Connecting to a service on a host behind NAT from another host behind NAT over the Internet

Assume you have a host (hosta) that is running a TCP service (e.g. a VNC server on port 5901). You want to access to this service from another host (hostb) running a VNC client. Both hosts are ...
2 votes
2 answers
8k views

Firewall open ports for vSphere

I need to open ports on a firewall, so that a client can 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 ...
1 vote
1 answer
5k views

Cannot open port 1883

I am trying to connect to a MQTT Mosquitto server by using a laptop with a wireless connection. However, I am getting timeout messages all the time. After doing some research I have come to think that ...
1 vote
1 answer
71 views

FTPS conncetion to Fritzbox NAS fails - due to EPSV / PAS port change?

I am using my FRITZ!Box 3490 with a connected USB HDD as a NAS server. I have configured a certain port (32753) for FTP communication. To ensure a static static servername (u**********u.myfritz.net), ...
0 votes
1 answer
7k views

Port forward localhost using Xampp

I have built a wordpress site on my localhost:8081 . Now i would like to access it from the internet(please dont suggest ngrok etc etc). I have a netgear wgr614 router. Now this is what i have done: ...
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1 answer
3k views

Centos 6 server does not open ports

So after some battling and struggling with the firewall, i see that I may be doing something or the firewall isnt responding correctly there is has a port filter that is blocking certain ports. Okay, ...
1 vote
2 answers
5k views

yum + connection refused

I can install the ntp rpm as the following by yum but before yum installation I get the failed lines as the following: yum install ntp Loaded plugins: langpacks, product-id, search-disabled-repos, ...
0 votes
3 answers
3k views

Secure FTP Port between Filezilla and Godaddy

I recently upgraded to Filezilla 3.0.x I am getting "filezilla error: Failed to retrieve directory listing godaddy" errors from Filezilla which i believe is because of a blocked port on my firewall ...
0 votes
0 answers
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Hyper-V Synthetic Ethernet Port: Error 'Access is denied'

Any suggestion how I can fix it without resetting Windows? The error I get on VM start up I have tried everything basic like switching off and on Hyper-V, deleting and recreating virtual switches, ...
3 votes
1 answer
10k 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 a problem with NMAP, it everytime says that host is down when I scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools....
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0 answers
32 views

How can I view an app in development from a remote computer?

I have a domain [I'll call it mydomain.com] configured for a Lightsail instance. This Lightsail instance comes with NodeJS preinstalled, packaged by Bitnami, which makes some changes to a standard ...
1 vote
2 answers
6k views

The port 55283 was occupied" errors comes whenever I use ShareIt

Today I installed ShareIt Windows software from ShareIt official site. Software installed correctly without any issue, but when I opened it, I am getting prompt "The port 55283 was occupied". I want ...
0 votes
2 answers
8k views

"No Route to Host" when making HTTP call to Linux server

I'm trying to configure a Linux server (NGINX) to allow HTTP requests through port 80 and it just doesn't seem to budge. When I run curl localhost:80 from within the server, I get the correct response....
2 votes
1 answer
7k views

Setting MAMP to use port 80 gives the "The requested URL / was not found on this server." message but it works on port 8888

I'm having this issue with MAMP on OS X Mojave. When I change the ports to be default (localhost:8888) the WordPress (wp-config) screen. This is what I'm expecting to load since I haven't set up my ...
26 votes
4 answers
142k 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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0 answers
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Centos 7 Not Responding Except Port 80

I'm facing an issue and I want to ask for any solution ideas. I have a CentOS 7 virtual server on the cloud. On this server, I installed Virtualmin. Last week, everything was working fine, but just ...
235 votes
1 answer
504k 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 ...
130 votes
6 answers
993k views

How to telnet to an IP address on a specific port?

Can anyone tell me how to telnet to an address using a specific port? I've tried the following: telnet 10.1.1.55 I suppose a route just hasn't been set up between the two hosts? What I am trying ...
6 votes
5 answers
15k views

How do I change the default TCP listening port for VLC HTTP Remote Control from 8080?

I think most of the info is in the question but here's a little more detail on what I'm trying to achieve. I control VLC via my Android phone and the VLC Remote app. It works just fine, but I'd ...
6 votes
1 answer
39k 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
1 answer
5k views

How can I close an open port on my router?

I have a ZTE ZXHN H168N V3.1 router. I did a random network scan on my ESET Internet Security and it says I have an open port 23, which is caused by poor configuration of the router. I checked my ...
1 vote
2 answers
3k views

How can I remap outgoing TCP ports?

Is there any way to remap a TCP port from a program were you not can change the port number? The program talks on port 4321 and I want it to go out on port 14321 on the local computer.
0 votes
1 answer
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What is the All 1000 scanned ports on X are in ignore states in NMAP mean

We are using the NMAP 7.92 version. When we run: nmap -sT XX.XX.XX It returned: Nmap scan report for XX.XX.XX.XX Host is up (0.31s latency). All 1000 scanned ports on XX.XX.XX.XX are in ignored ...
1 vote
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why does netcat work(to scan) faster in local host in virtual box but not for remote server?

I am using netcat to scan the ip of metasploitable2 from my kali machine in virtual box.netcat is very much faster to scan an ip of a local machine in virtual box. But when I am trying to scan a ...
14 votes
3 answers
8k views

What are ports and protocols really?

I hear people talk about ports and protocols (in relation to computer networking), and they often provide analogies for them (for example: "a port is much like a shipping port, it sends and receives ...
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1 answer
3k 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! 197.89.232.231 121....
26 votes
2 answers
301k views

What port or ports are used for File sharing in windows?

I want to know on the windows operating system, what is the port number for the file sharing service? For example as you know the port number for HTTP service is 80. So I need to know the port number ...

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