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.

Filter by
Sorted by
Tagged with
1 vote
0 answers
18 views

why might nmap on a computer be reporting port 443 as closed on some but not all computers?

When I run nmap event-bridge.twilio.com on roughly half the computers in my network I get this: PORT STATE SERVICE 443/tcp closed https When I run it on the other half of the computers in my ...
user avatar
  • 5,980
0 votes
1 answer
20 views

Do SSH clients use ephemeral ports?

Dumb this down for me, I'm still learning. SSH sessions are created over port 22 (assuming well-known configuration) on the listening side, but is the same port used on the client side? Or are ...
user avatar
-1 votes
1 answer
48 views

Port forwarding not working as expected

Im running a laptop connected to a router connected to the internet. Public ip of the router is not one of the ip's used for private networks (https://en.m.wikipedia.org/wiki/Private_network), and Im ...
user avatar
  • 1
0 votes
0 answers
41 views

Can't connect to remote SSH server, port 2222

I have problem with connection to remote server via SFTP from my MacOS, tested in FileZilla. Terminal SSH connection with same user&name (or key) works correctly. open "user@server_ip ...
user avatar
  • 101
0 votes
0 answers
12 views

Suddenly: USB ports on USB-hub always busy after restart, Windows 10

I have 2 setups of Windows-10-pro machines each using an external USB-hub. Connected to the hubs are three devices (1x usb-dmx adapter, 2x usb-rs485 adapter). Now, somehow simultaneously, both setups ...
user avatar
  • 141
0 votes
1 answer
300 views

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 ...
user avatar
1 vote
1 answer
24 views

How can i set port for ffmpeg's output rtmp stream?

Can i set different ports for output rtmp streams using ffmpeg? For example, ffmpeg -listen 1 -i rtmp://server0:port/live/key -c copy -f flv rtmp://server1/live/key -f flv rtmp://server2/live/key I ...
user avatar
0 votes
1 answer
45 views

Nobody listens on port, yet something accepts connection on it

Here is some background information first, although it may not be relevant to the problem. I am learning Kubernetes and I set up a cluster where pi-hole runs as a service. I can access the admin ...
user avatar
  • 11
1 vote
1 answer
62 views

What is the purpose of the windows firewall prompt?

Example: What is the purpose of this prompt? Pressing 'Cancel' doesn't block the program from accessing the internet, so... what does accepting this prompt allow the program to do? I haven't been ...
user avatar
  • 131
0 votes
0 answers
42 views

How to change which port WSL2 uses?

I'm using Acrylic DNS and it somehow conflicts the port with what WSL2 uses and I cannot open WSL2. When I kill the Acrylic DNS I can now open WSL2: netstat -a -n -o // outputs: UDP [::]:53 ...
user avatar
  • 103
0 votes
0 answers
15 views

Duplication of UDP traffic to two ports on localhost on windows

I have two services running on virtual machine running windows. Each service has an open port for recieving information. I want to know how can I set up all traffic to one of the service's ports to be ...
user avatar
0 votes
0 answers
130 views

UDP Port forwarding on Windows 10/11

I'm trying to forward TFTP server port from 69 to higher ports to avoid permissions issues. We're using the following command on the Linux (Ubuntu): sudo iptables -t nat -A PREROUTING -p udp --dport ...
user avatar
  • 103
0 votes
0 answers
34 views

FortiGate Making Ports Appear Open

Recently we were doing some port scanning on some machines located in AWS to see what came up. This is in preparation for a launch of our new product in a couple of months. While doing this we got, ...
user avatar
0 votes
0 answers
27 views

port 41826 unknown on home router ip 192.168.1.8 why is the port open?

Using Port Droid, I scanned all ports for IPv4 on my home router. I found port 41826 unknown on home router ip 192.168.1.8 open unknown. Why is the port open or unknown? Port forwarding is closed. I ...
user avatar
0 votes
0 answers
77 views

Port forwarding suddenly stopped working on TP-Link router (Archer AX1500)

Over the last few hours or so, my ports have been timing out one by one, until as of a few minutes ago, they all stopped working. Restarting the router through various methods only seems to have made ...
user avatar
0 votes
0 answers
102 views

port 22 blocked even though ssh is enabled on mac

On mac I have installed SSH and have verified this by running sudo systemsetup -getremotelogin on terminal, which outputs Remote Login: On. Howeverm when I try to check port 22 on https://www....
user avatar
  • 101
0 votes
2 answers
160 views

Accessing SSH on multiple devices connected to the same home-router (Port-forwarding solution)

So, I have multiple devices connected to my router via ethernet cables. All devices have some kind of SSH-service running and are reachable over the WAN/Internet via "ssh user@public.ip.adress&...
user avatar
0 votes
1 answer
13 views

Port ownership when accessing an Internet address

Let's say we're accessing the google.com:443 server. Port 443 is used here, is it an internal port that is issued by the operating system to the google server, or is it the port of the router that, ...
user avatar
0 votes
1 answer
262 views

bitcoin-cli testnet : Could not connect to the server 127.0.0.1:8332

I've installed bitcoin-cli from here I run the bitcoin core on Ubuntu 20.04 (AWS EC2). mac-os also experiences similar problems. Ubuntu 20.04 screen capture for the error messages The commands I've ...
user avatar
0 votes
0 answers
14 views

USB device only recognised on other port

Sometimes USB-A devices aren't recognised any more after a reboot or even when plugged in. In the first moment I thought about a faulty port. Oddly other devices work on those ports with no problem. ...
user avatar
  • 101
0 votes
0 answers
71 views

Why does it seem many things on my network are using tor-orport when I only installed it on one machine?

Here is the output of nmap -sV -O 192.168.0.0/24 -p 9001: Starting Nmap 7.92 ( https://nmap.org ) at 2022-03-03 20:55 Pacific Standard Time Nmap scan report for 192.168.0.1 Host is up (0.0037s latency)...
user avatar
0 votes
0 answers
54 views

What ports range is safe from taking by Windows 10

I wrote small program and I would like to use some TCP ports. Same ports for a longer period of time. The problem is each time Windows 10 wakes up it makes its mind which ports to reserve for its ...
user avatar
0 votes
0 answers
45 views

Find what port number is in use by a service

So I'm trying to take a windows service on one of our servers, "SC - ATM-Encryption" and find out what port it is using. All answers I've seen close to what I'm asking have me doing: netstat ...
user avatar
  • 49
0 votes
1 answer
62 views

Command Prompt to Enable ports in Windows Firewall

I was experimenting and was not able to find an way to enable rules/ports under Inbound Rules in Windows Firewall. Every thing I've tried so far only shows or creates something new such as this netsh ...
user avatar
0 votes
1 answer
103 views

How can Windows Firewall be used to further increase security in Windows 10, would it be by blocking particular ports?

How can Windows Firewall be used beyond it being turned on, to increase security of a Windows 10 Home PC, would it be best to use the firewall to block these ports? I would like it to be as secure as ...
user avatar
  • 87
0 votes
0 answers
14 views

Make a mongodb instance running on localhost available on public port on remote server

I am running a mongodb instance on on localhost on protected_server which is not accessible from the outside and I want to make my database accessible on the 27017 port of open_server. I tried ssh -R ...
user avatar
  • 133
0 votes
0 answers
47 views

macOS Monterey Heroku CLI error when running remote command

I'm trying to run this command in a Heroku deployed application: heroku run 'POOL_SIZE=2 iex -S mix' -a name-of-the-app And after waiting like a minute or so I get this error: Error I found this ...
user avatar
  • 1
0 votes
1 answer
29 views

Terminal on Mac not providing responses using various PID related commands

When I try and find the PID of a port using a command such as any of the following (where xxxx is the port number): lsof -i tcp:xxxx netstat -vanp --tcp | grep xxxx sudo lsof -i -P | grep LISTEN | ...
user avatar
1 vote
1 answer
44 views

Connecting to a Virtual Machine(Hyper-v windows 11) from outside the Network with Remote Desktop controll. have i done everything till now right?

thats another Post, almost the same Question, but this time i am almost done , and i want to ask if i did everything right up to this point. So what i want to archieve? I want to reach the my Virtual ...
user avatar
0 votes
0 answers
65 views

Laptop can't connect to internet: "destination port unreachable". What can cause it?

One of our acer laptops suddenly can't connect to the internet through ethernet, although, it can reach the printer on the network. But pinging the default gateway or any external IP results in "...
user avatar
0 votes
2 answers
62 views

Self hosted game server security

Not sure if this is the correct place to post this question... My son keeps asking to set up a minecraft server on his PC which then gives him control over the "world" and he can invite ...
user avatar
  • 113
0 votes
0 answers
27 views

Ports required for Apache Spark standalone cluster (1 node) on CentOS 8

I want to install Apache Spark (v 3.1.2) standalone cluster on CentOS 8. What ports should I allow in my firewall?
user avatar
3 votes
1 answer
67 views

Point a subdomain to a minecraft server

I'm trying to get my minecraft server to be reachable through my domain name, as opposed to needing to connect with the IP and port. Because I want to host multiple servers, it would be ideal if I ...
user avatar
1 vote
0 answers
51 views

Port 2121 is blocked but no application uses it

I'm using Windows 11 and want to start an application that uses local port 2121. But currently I always get the message that the port is already in use. Even completely reduced examples in Java or ...
user avatar
  • 11
0 votes
1 answer
35 views

Host apps same port different URLS

I have an application that is listening on a predefined port. I have configured it to use port 443, so that the user can just connect to a url. Now I would like to have two instances of them running ...
user avatar
0 votes
0 answers
32 views

Why I can't detect traffic with TCPDump on host that receive through port mirroring

I can try to detect the traffic with tcpdump on host described in subject. with the #tcpdump -i any I can't view the traffic from span port. I think that the cause of this behaviour is the traffic was ...
user avatar
-1 votes
2 answers
164 views

iptables block torrenting port on openvpn VPS

So I know you can't really block p2p without doing some layer solutions but my problem is much simpler. I am in a country that torrenting is fine (no one cares) but accessing basic sites like youtube ...
user avatar
0 votes
0 answers
199 views

SSL port 443 not responding and https not working

I have successfully setup SSL using CERTBOT on my NGIX server. However when I tried to use https://domainame I'm getting a not responding response. netstat -ano | grep 443 gives me the following ...
user avatar
  • 109
0 votes
1 answer
262 views

How do I port forward a Linux computer?

For quite a while I tried to use port forwarding using my network. But it never works. This is what I typed when I tried to port-forward a SMB drive. The External & Internal ports 445 and 192.168....
user avatar
  • 1
0 votes
0 answers
168 views

Apache / XAMPP: Cannot Access Port Via Public IP For Web Socket Server

I have a PHP application/website which uses web sockets. I am using XAMPP to run Apache for the webserver on port 80: Within XAMPP I run a script that starts the web socket server. The script listens ...
user avatar
0 votes
1 answer
417 views

Cannot telnet to a local server

I want to reach a Windows PC on my LAN on a specific port, but it fails and I can't find the reason. Can you spot anything? PC is running Windows 10. I have disabled the Windows Firewall on it (for ...
user avatar
3 votes
1 answer
375 views

Ports can't be used even though nothing is on them

My Windows 10 computer keeps getting stuck in a state where many ports are unable to be used, but when I try to find and kill whatever is using the port I can't find anything. Restarting my computer ...
user avatar
  • 141
0 votes
0 answers
62 views

How to connect container webserver from host browser?

I am running a docker container in an office server. The container within, is running an apache2 web-server on port 80. The docker container has been run with the following command: docker run -it -p ...
user avatar
0 votes
0 answers
47 views

IPtables - How to block traffic to more than one interface besides eth0

Since I was not given the specific ethernet port to use for incoming and outgoing traffic, ( and I am brand new to ip tables) I was wondering if there a way to specify multiple or 'ALL' ports on a ...
user avatar
2 votes
1 answer
150 views

How do I forward a port to a subdomain for non-http services

I am running two minecraft servers on my home network. I want to open them up to the world by forwarding the port. I may possibly add more minecraft servers, but I don't want to keep opening up ports ...
user avatar
  • 23
0 votes
0 answers
22 views

Binding second ip to port Windows

I have a windows PC with 2 ip4 addresses (for ex 1.1.1.1 and 1.1.1.2) and I want to use them as proxy for web surfing. For example, if I set as a proxy ip 127.0.0.1:80, it works, but only with the ...
user avatar
  • 1
0 votes
1 answer
127 views

Uninstall and reinstall raspberry pi desktop on chromebook

I have a 4GB Raspberry Pi which stopped booting recently. I want to uninstall and reinstall the os so it will boot up fresh. I don't have an adapter, but I do have a chromebook which has an sd card ...
user avatar
0 votes
0 answers
347 views

Unable to connect to MQTT broker using local IP address

I have a Mosquitto broker running on my Windows machine. I can connect to this on the same machine using an MQTT client such as MQTTX when I specify localhost as the address. However, I want other ...
user avatar
0 votes
1 answer
52 views

Ubuntu server Iptables rerouting not working properly

I am trying to setup a simple node.js express app on ubuntu server. I wanted my app to listen on port :80 but it was throwing errors on startup so i changed it to listen on port :3000 (I don't really ...
user avatar
0 votes
0 answers
22 views

Different Firewall Rules For Different IP Addresses on Windows Server 2022

I want to have have ports 80 and 443 open on 1.1.1.1 but only have ports 5000-6000 open on 2.2.2.2 How can I configure Windows Firewall to fit these rules?
user avatar
  • 13

1
2 3 4 5
25