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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How can I change the default port (8333) of Bitcoin Core on Ubuntu 20 LTS?

I am trying to set up a second machine on my network to run Bitcoin Core. As I’m port-forwarding on my router port 8333 already (the default port of Bitcoin Core), I can’t use the same port on my ...
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Closing port 22 after changing ssh port to new custom port?

I created a new server and changed the ssh port to a new custom port. Everything works as expected. I went through multiple guides and all of them stopped after opening the new port. My question is: ...
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Why I Can't Open Any Port?

I want to create a minecraft server but it need port forwarding, I don't really know about port forwarding so I looked up tutorial on Youtube. It ended up not working for me and I really don't know. I ...
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Packet reaches OS but not the process

Sorry if my issue is a bit hard to summarize in the title. That is the best I could come up with. TL;DR Version: How do I debug when packets reach OS, but not the destination process? Explanation: I ...
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port forwarding doesn't work

I'm trying to open a port to play a game with my friend and it's not working: when scanning ports on my public IP via a port scanner, it shows no results for any ports. Router port forward settings: ...
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How do I restrict access to all ports with source's PublicKey like SSH does?

I want a server to block any and all incoming traffic on all ports with the exception of the traffic from those machines which can be (and are right there and then regardless of the port being ...
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Can anyone identify this port?

There is a port on the front of my computer behind a little trap door. It is separated into two parts, one with 7 pins and one with 15 pins. Does anyone know what this port is for? ![Port on front of ...
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COM port in Windows 10

I understand that the COM port is a serial communication port inside a computer. But in my windows 10 laptop, I don't see any COM port connected. If I go to the control panel -> Device manager, I ...
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Test if an unused port is reachable on a unix system

Imagine having an unix based system S1 - any common Linux distro with the most common out of the box setup - inside a network setup N1 which features a firewall F1 allowing some ports P1 and P2 ...
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lost ability to bind port 80 on mac, how to debug?

In the last few days I lost the ability to listen on port 80 with docker, and with nodejs without using sudo. Before, I could simply launch my exact same docker containers on port 80, and it would ...
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Debian Server - Port 2015 ( cypress ) reported open by nmap

I'm running a headless Debian server as a media center with two services running: SSH and Jellyfin. I decided to do an nmap scan this morning and it reported that port 2015 is open, which is ...
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Specific user can't run Spring Boot application on port 443, but root can do it

I can't run a Spring Boot application on CentOS under a specific user on the port 443 (or 433 it doesn't matter). Caused by: java.net.SocketException: Permission denied Root can do it. When I tried ...
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How to find home router's port number?

I can't access my router. I have the IP, but I don't know the port number, and I can't access it without it. If anyone knows a way to override, and access without port number, please say. Up till now ...
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How to use both front and rear audio simultaneously? (MSI A320M)

After researching multiple sources it seems MSI A320M VD/S m-atx motherboard should be able to be used with 2 mic inputs and 3 audio outputs at the same time - 2 front ports, 3 rear ports. However I ...
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macOS High Sierra port forwarding issue

So I have the following problem on MacOs High Sierra 10.13.6 and I cannot solve it any ways. To update a certain app, Port 80 needs to be opened. I forwarded it in the Router (other port forwards ...
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Block outbound on 80,443 except Windows Updates on Windows Server 2019

I can't believe I didn't find a proper solution for this problem, which I assume to be quite common: We have some Windows Server 2019 machines in the network, which are SQL-Server, frequented by ...
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Does the Windows “browser” service need access to DNS (port 53)?

Does the Windows "Browser" service need access to DNS (port 53)? If so, in what cases? By "Windows", I'm referring to Windows 7-10.
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How to find open ports using netstat?

When I do a netstat -tuln, I get the following output Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:25 0.0.0.0:* ...
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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 ...
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Ethernet port not working

I have an ethernet port which used to work before. The port is connected to a switch, and the switch is connected to the router. It suddenly stopped working, as in any device connected to the port ...
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Why can't the forwarding table of a router have a mix of private and public network entries?

For example, for the forwarding table below, is the 192.168.120.32/29 entry invalid because it belongs to a private network while the others don't? And if so, why is that? I must be very confused ...
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How can I know what is preventing my socket to bind to localhost:50060-50959

I am using this Python code to listen to a port on my Windows 10 system: import socket for port in (50059, 50060, 50959, 50960): try: print(socket.socket(socket.AF_INET, socket.SOCK_STREAM)....
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Open service port out of Docker

In installed some docker application on my virtual server, and I never modified the iptables policies. When I run a full nmap to the virtual server I obtain, Host is up (0.044s latency). Not shown: ...
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Port 9001 used by Microsoft-HTTPAPI/2.0

The port 9001 seems to be used by Microsoft-HTTPAPI/2.0. I get this from the browser doing a http://localhost:9001/ HTTP/1.1 404 Not Found Content-Type: text/html; charset=us-ascii Server: Microsoft-...
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Why can't I see a local service (PC) from internet?

I'm having an issue with port forwarding. I'm trying to setup a Snes9x server, so I start it and it says is listening on port 6096 (TCP). If I establish a local connection (with two instances of the ...
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how to port forward to one device while another device shared the same public ip

my ISP only gave me one public ip address, i want to port forward on a single device but all the devices connected to the router shared the same public ip address. is there a way to do it? i use ...
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host mutliple servers on the same port?

Okay, I have two physical computers on my one network, they are both running CSGO servers. Let's call them Server A, and Server B. Server A and Server B are both set to bind to the same port. But, ...
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Share large files through torrent - deluge

I am trying to share a large data file (~2.5 Gb) with a colleague using the bittorrent protocol. I am on Fedora 30 and I am using Deluge 1.3.15. To create the torrent file, I am following the steps ...
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Firewalld: allow only certain source and destination port pairs

I am using firewalld to configure my firewall. I tried to create a service that allows a specific pair of source and destination ports: <?xml version="1.0" encoding="utf-8"?> <service> &...
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SSH port forwarding breaks the original port?

I have a device configured to use port forwarding via ssh to allow access remotely. This works fine, except that for most of the forwarded ports the host seems to now refuse direct connections with ...
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What was the “sae-urn” protocol on port 4500?

Port 4500 is a documented home to a couple of standards:🕗 4500 - ipsec-nat-t - IPSec NAT Traversal 4500 - sae-urn IP-Sec NAT traversal is explained in a number of RFCs: rfc3947 - Negotiation of ...
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C# Unity Client SocketException: Connection refused

I got referred here from StackOverflow. When I try to run an application on Unity, I get an error (SocketException: Connection refused) on the line: using (TcpClient tcpClient = new TcpClient("127.0....
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How can I block (ssh) traffic from source ports other than a pre-defined one?

A VPS get lots of ssh attacks. Those attacks are various source ports: sshd[76661]: Invalid user ts3server from 76.103.161.19 port 33062 sshd[76661]: Received disconnect from 76.103.161.19 port 33062:...
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Router port forwarding is unsuccessful (can add them, but they don't seem to open)

I have a CH6643E which I'm trying to port forward. I've always had this issue on this router, and I've ran out of ideas on how to fix it. I've searched how to port forward this specific router, and ...
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Which of these Windows services is most likely responsible for outgoing port 53 (DNS) traffic?

Working on a Windows 7 system that has network traffic very locked down. The system is not running any servers. Besides Windows itself, and an antivirus tool, it does not have any software that ...
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Blacklisting port-scanner via iptables

I operate a VPN server and am having issues with DDoS attackers port-scanning my VPN for open ports to flood. I need a rule that will blacklist them after they have contacted X ports in Y seconds, so ...
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Audio port unresponsive when turned on- Laptop

So I bought this new laptop- Asus VivoBook 14 and even after replacement I am encountering a bizzare issue. The issue is.. I have connected external speaker through 3.5mm jack and when the laptop is ...
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External Address Problems

I would like to create a Minecraft Server, but searching the internet I found that the command netstat -an allows me to see all active connections and their respective IP's. What happens in my case is ...
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Redirect HTTP paths to ports, keeping the rest

I have the issue where I want to redirect a URL, like https://foo.bar/foobar/thing to https://foo.bar:1234/thing. I have seen solutions where one could redirect from /foobar to port 1234, but how ...
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USB PCMCIA READER TO COM PORT

I recently got a USB PCMCIA reader, however the software I need to use it with reads from the COM PORTs. How can I change the USB port to a com port o the software can read the PCMCIA card?
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How to close a lot of open ports on home laptop

I scanned my laptop for open ports. Nmap found about 1000+ open ports with unknown services. I tried to create rules in the Windows firewall that closed these ports, but this did not help. Also I used ...
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Can't open 8888 from VM host to linux guest

I started a jupyter notebook service on a linux guest, there is no problem for me to access it from a browser within the guest with the address like localhost:8888 When I tried to access it from my ...
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connection to vsftp server with custom port not working

I have setup a vsftpd server on centos 7. Service is up and running and I can connect to it via: sftp user@host user@host's password: Connected to user@host. sftp> pwd Remote working directory: /...
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Block process outgoing requests

I have a program on my computer that repeatedly tries to access a webaddress that no longer exists or something, causing it to hang for minutes on end while, I guess, it waits or cycles attempts to ...
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How to know if a port is blocked between host and guest

I have a Kibana installed on CentOS in VMWare, starts with no issue on 5602, and accessible from VMWare, but it doesn't allow me to access it through my VM host which is my desktop, indeed I see error:...
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Botman, debian 9, port 8000 : ERR_CONNECTION_REFUSED

I'm currently trying to install a botman on a debian 9 server. I install botman, launch the botman server with success : # php artisan serve Laravel development server started: <http://127....
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How to unlock port isolation from firmware router ZTE F609?

how to unlock port isolation on firmware? cause i can't find it. Modem router : ZTE F609 It causes i can't ping from my wired to wireless devices. wlan isolation already unchecked. Still can't ...
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How to force ssh -R forwarding to force opem specific port [duplicate]

I am running ssh in this form for a redirect on a cellular networked IoT project ssh -R 43101:localhost:5001 -R 43122:localhost:22 user@remotehost.com This works, but occasionally it will disconnect ...
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109 views

Windows Service rundll32.exe always listening on port8080, even when stopped

I have a problem when i start my Java application by Spring (using tomcat), the port 8080 is allready listening by a service, which is "rundll32.exe", apparently a legitime file from system32, but ...
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Softether Port 1701 UDP Issue

I have a Problem with my SoftEther Server: There is no way to tell the SoftEther server manager to listen on port 1701 (which is the L2TP/IPsec default port for Apple devices). According to the ...

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