Questions tagged [port]
The port tag has no usage guidance.
218
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Find out what MAC addresses are connected to each physical LAN port of router
I'm managing a router running Linux 3.10.87-rt80-Cavium-Octeon
On the router's GUI, there's a "Switch ports" page where I can see all ethernet ports (4 LAN - 2 WAN) and their corresponding ...
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Finding out all blocked port numbers
The Internet connection in my hostel room is provided by my college which blocks a few ports (eg. 6881-6889 to prevent usage of torrents). I want to find out exactly which ports are blocked, because I'...
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Port service translation
I have one public ip and only one inbound port to listen in my machine.
How do I redirect port request based on client service?
For example, my server is listening on 12345 (TCP/UDP) with public ip 35....
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2
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707
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Given a service name, get its port number?
Hi I feel like this is an obvious question but I haven't been able to get a good answer so far. Given the name of the service (which I know running on localhost) is there any networking command line ...
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I can't block a port with ufw
This morning I received a report from Netscan:
Netscan detected from host 8X.19X.1X.1XX
time protocol src_ip src_port dest_ip dest_port
Fri Sep 15 05:21:59 2023 UDP 8X.19X.1X.1XX 5065 => 9.87.179....
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Ubuntu Virtual Machine not detecting Arduino, it yields "Can't attach the USB"
I am facing an issue when I try to detect the Arduino on the Virtual Machine which is running Ubuntu 20.04. When I connect Arduino on my Laptop (Macbook), the Arduino IDE on the Mac detects the ...
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2
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154
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Does firefox using port 80 / How to stop it
Everytimes I open my pc and try
$ lsof -i :80
I get
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME firefox
3082 totoXXX 41u IPv4 100396 0t0 TCP
totoXXX-PC-E15-Gen-2:39000->...
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35
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Why does netstat show my socket tutorial program having a port of "x11-1" instead of the port I set in code?
I am trying to learn about socket programming, and I have the following function to set up a socket:
29 int CreatePassiveSock(char *protocol, char *portstr, int qlen) {
30 ...
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1
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173
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"Can't connect to ('0.0.0.0', 80)" when asking Doccano to serve on port 80: what is the issue?
I use Doccano on Ubuntu 22.04.
I get the error "Can't connect to ('0.0.0.0', 80)" when asking Doccano to serve on port 80: what is the issue?
Asking Doccano to serve on port 8000 works fine....
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113
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What is "mtr --report --tcp --port=22" telling me?
RHEL 8.4
Here's the output of mtr to a server for which the firewall is open to port 22:
$ mtr --report --tcp --port=22 --no-dns Server1
Start: 2023-08-09T21:49:20-0400
HOST: foo.example.com ...
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207
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How to safely open ports in ubuntu 22.04 for Cyber Protection Agent
In Ubuntu 22.04, I have installed the Backup Agent for Linux Servers "Cyber Protection Agent" on vps.
I have followed this link https://www.ionos.com/help/server-cloud-infrastructure/cloud-...
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2
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485
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what is BHFHS protocol port 248?
I am pondering using port 249 for NFS RDMA in RHEL 8.8, using the NFS export secure option requiring the port be below 1024.
https://www.iana.org/assignments/service-names-port-numbers/service-names-...
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618
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NFS4, insecure, port number, rdma contradiction help
With RHEL 8.8 currently, and RHEL 9.x, the latest NFS version is 4.2.
When NFS 4 was introduced, it did away with a few things in NFS3 one of which was multiple port numbers:
NFS4 mandates all ...
- 6,122
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28
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Netcat uploads hanging after a certain point
I'm working through an introductory cybersec challenge that requires me to upload a word and brute force a 4 digit code to a port. I put the combinations in a file, and tried to use netcat to upload ...
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192
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Curl always trying to connect with http in home network
Tldr;
From my home network on a (MacOS Venture 13.4): curl https://ifconfig.me works but curl ifconfig.me or curl http://ifconfig.me not working.
When connecting to other networks both work fine. Is ...
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264
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Understanding dsi system in device tree
Let's say there is a video bridge like sn65dsi86. It has a driver ti-sn65dsi86.c in kernel source tree. It should be enabled with device trees. There an example for device tree. But it is not complete....
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64
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Nmap scans are not persistent after reboot
I use Zenmap on Linux 6.0.0-kali3-amd64 which runs on Oracle VirtualBox to see open ports in Metasploitable2. When I save the Zenmap scan to /home I can successfully open the scan again until I reboot ...
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68
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TCP port visible from inside nor outside
I've used autossh (reverse) connecting to my server. The ssh side works like used to. But in an ARM64 system, my Ubuntu has less possibilities but this is another story (...).
So what I see whit nmap ...
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3k
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Telnet connection refused
I have been trying to connect using telnet. I keep on getting Connection refused.
After checking ports listening, I observed the port is listening to the localhost IP 127.0.0.1 but I wanted it to ...
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1
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159
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limit connections per port
My question is about setting a connection limit to each port.
I've made a v2ray server for VPN using x-ui.
When I create a new config for users, each config uses to a random port. Now I want to limit ...
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205
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How can I forward port 8080 from my linux machine to be visible on port 2007 of my internal network using ssh?
I have a linux server hosting an applcation on port 8080
Inside putty, i have create a port forward from port 2007 to 8080 by specifying the public IP of my server, where's covered in red below
How ...
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255
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vsftp : understanding passive mode, extended passive mode, and how to configure them
I installed a vsftp server. It works, with command line 'ftp' I can connect to it and upload ('put') files. But if I type 'ls', then it hangs after displaying:
Entering Extended Passive Mode (|||<...
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269
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Which systemd service this port use?
I have installed a program that uses systemd
sudo netstat -lntp | grep 10700
tcp 0 0 127.0.0.1:10700 0.0.0.0:* LISTEN 2444/systemd
tcp6 0 0 ...
- 9,437
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80
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Is not possible change MySQL's port at Fedora Server 36
For Fedora Server 36 was installed MySQL 8 Community through the .rpm from MySQL Community Downloads. Now according with the Editing Conf. Files section is indicated to use the /etc/my.cnf.d/community-...
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524
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Ubuntu Server can't Access the apache outside localhost
I know this question is already posted alot but I already read them all and not solve my problem.
I already have fresh install ubuntu 20.04 with fresh installed mysql,phpmyadmin,apache
when i open my ...
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27
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Open port on Ubuntu Dektop not accessible out of machine
I have opened 9591 port with 0 0.0.0.0:9591 on Ubuntu Dektop machine,
$ netstat -tulpn | grep 9591
(Not all processes could be identified, non-owned process info
will not be shown, you would have to ...
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704
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Ports not reachable after reboot
after I rebooted my server, I can no longer ssh into it. I am running headless Ubuntu 20.04.5
After investigating the problem, I've noticed, that all ports on my server appear to be closed (using an ...
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Server hosted on virtual machine with VPN can't be accessed on host machine using same VPN?
I am an absolute novice so there may be misunderstandings etc. any and all forms of help are very appreciated.
On a virtual machine (Virtual Box) using Kali Linux I am hosting BeEF with OpenVPN ...
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328
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Opening a "closed" port
I am trying to set up a SAP System on SUSE Enterprise, but I'm having trouble connecting to the server.
I added multiple ports to the public section of the firewall and with most of them I am able to ...
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108
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Blocking a specific port
I need to block specific ports temporarily on AIX 7.2 to simulate an application using this port. I am developing a workaround for an application ignoring the entries in /etc/services and using ...
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139
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SSH connection refused on external network with the default username
I recently tried to configure port fowarding on my raspberry pi, to be able to connect through it from anywhere. So, I changed my box parameters to permit it.
It seems to work, as my raspberry pi is ...
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515
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is there any way to limit number of clients (IPs) to connect a port ? (ubuntu 22)
I'm trying to find a way to limit the number of IPs that can connect to a certain port. here is a simple example that returns the number of unique IPs connected to a port
netstat -ntu | grep :80 | ...
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201
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UFW seems to be ignoring allowed ports in specific cases - Solved
I've got a Raspberry Pi set up with UFW firewall to try and secure it as best as possible. Most of the rules seem to work absolutely fine, but for some reason, it's blocking specific connections which ...
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135
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How do I expose a port that an app is only allowing local connections to?
An app on linux-based "headless-box-1" is listening for HTTP connections on http://127.0.0.1:7860. Which restricts connections to self.
But I wish it was listening for connections from any ...
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755
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Enabling outbound traffic on all network ports
I am working on a network gateway implemented with a single board computer running Ubuntu (I can't confirm the version since it is not an off-the-shelf distro, it is built using buildroot). I am ...
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Disable port 8910 and then again enable when required in my linux based server
As you see below jsvc.exe is running on 8910 with PID 23943.
[root@abc-163 ~]# netstat -tulpn | grep :8910
tcp6 0 0 :::8910 :::* LISTEN 23943/jsvc....
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docker exposed port not accessible from outside even when port is opened using iptables command
I have a sample docker tar image in my linux based server and ran that though docker run command as below where 9521f101839f is image id.
docker run -p 0.0.0.0:9895:9898 -td 9521f101839f
So now ...
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907
views
Socat specify source port
How do I specify source port in socat?
In netcat I can simply:
nc -u -s 192.168.0.1 -p 8888 192.168.0.2 9999
I tried
socat udp4:192.168.0.2:9999 STDIN:192.168.0.1:8888
It's failed
STDIN: wrong ...
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How does a telegram bot work in Linux?
I wrote a simple telegram bot and it works great without conflicting with my firewall. But my question is this, in the firewall I have ports 80 and 443 allowed for my site, but when I write a TCP ...
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Unable to connect to a listening tcp port 80, Iptables is not blocking it
I am trying to see if tcp port 80 is open on a debian 11 server. I logged into it using SSH and did curl -v telnet://localhost:80. It says connection refused. If I do the same with port 22, it shows ...
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How can I make a port inside a virtual machine accessible to the host if the virtual interface has its traffic forwarded through a TPROXY target?
I have a virtual machine connected to virtual interface that has all its traffic sent through a TPROXY transparent proxy:
ip tuntap add tap0 mode tap
ip link set tap0 up
ip addr add 10.0.0.1/24 dev ...
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535
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Check what service is running on a specific tcp/udp port
I'm looking for a command-line utility that allows me to check what service (eg: http/ftp/ssh) is running on a specific port of a remote machine.
An example of how I imagine a program like this would ...
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59
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forward outgoing port and sourcenat this traffic
I have crawled the internet, and tried some config, but so far, i am stucked, so i would need a little help if someone has a better experience than me on this. :)
I got a server,server1, behind a ...
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128
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Port forwarding 3389 into local network safety
I've installed xrdp on a system running centOS7 - this allows me to rdp from any pc on the network using the local ip/hostname. I'm looking to be able to rdp straight into the system from outside of ...
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184
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If ports are unpriviledged, why can't I access them if I am root in a namespace?
I've run sudo sysctl -w net.ipv4.ip_unprivileged_port_start=1. However, sudo ip netns exec myvpn unshare -r python -m http.server -b 127.0.0.1 2 does not work. Strangely enough, this does: sudo ip ...
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50
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Cannot connect to other instances within an AWS LAN
My client installed several AWS instances, all in the same region/datacenter.
My task is to install a Redis and a Postgresql instance on one of the machines and make the data store/database accessible ...
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1k
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how to Find the port number according to PID [duplicate]
The following command can be used to find out which process is listening on a particular port:
netstat -ltnp | grep -w ':8011'
How can we do the opposite, find the port number according to PID ...
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347
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iptables not blocking access via ports?
I'm running Debian 8.11 with iptables v1.4.21 and ipset v6.23, protocol version: 6.
I'm trying to block access to certain ports for all but a small set of hosts, but it doesn't seem to be working.
...
- 565
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1k
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Serial port to COM port - no output found
I am using Ubuntu WSL1 in Windows. I want to find my serial port which is currently connected on COM4 and I am running this command:
dmesg | grep tty, dmesg | egrep tty, setserial commands, but ...
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239
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iptables: Failure when trying to block port access for most IP addresses, except for a few
I am using Debian 8 linux.
I'm trying to block input access to a few ports for most IP addresses, except for a small, select list of IP addresses. I am doing the following, but it does not seem to ...
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