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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Cannot access web server at my house when I share an external IP [duplicate]

For years I've used Comcast and have had port 80 open to a web server at my house, without issue. I switched to CenturyLink fiber last week and port 80 forwarding works and my server is also visible ...
0 votes
1 answer
63 views

Networking and access

I do not know all the networking terminology so I'll try to explain what I want to do. I would like to bridge my neighbor in to my network wirelessly using CPE's, but I do not want them to have full ...
0 votes
1 answer
108 views

What is this port, 15x4, missing (13,4), possibly video

I am trying to connect to an old (circa 2007) Linux box that I use for image processing. I've never had to connect to the box physically, I always did everything over telnet. But now I want to access ...
1 vote
2 answers
313 views

Firewall and Torrent

I use my university internet network and all incoming connection is blocked on every port.(they use netasq firewall) They have no other restrictions which stops me from using a torrent client. Using ...
0 votes
1 answer
947 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. TPG (my internet provider) said port forwarding is possible with them and they don't block any ports. Multiple port checkers state the port is ...
1 vote
1 answer
690 views

Determine what process is talking to a remote port on Windows Server

I took over a product from a contractor at my place of work. The tool collects metainformation. The exact nature of the information isn't important to the question, but it exists as either a flat file ...
2 votes
3 answers
44k views

Using nmap to traceroute on a specific port

The short version of this is that from client A to server B, some connections are getting all the way there, and others are being dropped in transit. I know they're being dropped in transit because, ...
7 votes
4 answers
107k views

How to test port by telnet command on localhost?

I have windows Xp , I want to test some port , someone advice me to use telnet command on localhost to test it . but i don't know how i can do it (syntax of telnet command on local host) ?
0 votes
1 answer
436 views

Explaining output of netstat -lntu

When I do netstat -lntu on a server running my web application, I get the list of services running on the system. I originally did this to see which ports were open. The list I see is given below. ...
0 votes
2 answers
2k views

Conduct ADSL over an Ethernet cable

I have a DSL (actually VDSL2) socket in the wall in one room, it looks like this: source And I have an Ethernet cable (CAT6) running from that room to a second room. Currently, a modem/router is ...
0 votes
0 answers
95 views

Minecraft Server port opens but wont STAY open

I've been hosting a Minecraft (FTB Infinity Lite, to be precise) for some friends for about a week now. My issue: Port is forwarded, once server is started, players can join perfectly fine, all is ...
3 votes
2 answers
26k views

I don't see a port forwarding option in my router, how can I set up a ssh server then?

Sorry if this is something too basic, but I'm new in this kind of stuff... so I started a personal project a couple of days ago and for this little project I would like to connect to a notebook that I ...
0 votes
1 answer
965 views

Ubuntu + Jetty: Permission required for service using port above 1024?

I am trying to run jetty as a service on ubuntu 16.04 on port 8010. It fails with a SocketException: Permission denied. As far as I know ports above 1024 are free to use, so I'm wondering why I get ...
0 votes
1 answer
50 views

Port Tunneling for windows

I have one AWS instance with public IP <52.14.142.152>. Now I have installed one application on port 5555 and able to access the same from internet. I have installed another instance of same ...
7 votes
3 answers
26k views

What type of port has a logo with one long line and three short lines under?

On the side of my laptop (ThinkPad x40) there is an odd place for connecting wires, directly under one of the USB ports. The port looks similar to those for USB, with a similar rectangular shape and ...
1 vote
0 answers
2k views

Are applications able to open ports in modem without permission?

Yesterday i logged into my modem's admin page and saw that some ports are open without my permission. There were 2 apps that were using these open ports EA and Whatsapp. I rarely connect to my modem, ...
0 votes
1 answer
224 views

Communicate with a single-user Ethernet-connected device — OK to use shared LAN?

I have a workstation that has two network ports. One of them is required to connect the PC to a local area network. The other port is available to accommodate an Ethernet device that I (and nobody ...
1 vote
0 answers
3k views

masscan not showing open ports

I scan an IP with nmap and a port is open, but when I scan with masscan it shows found=0. EDIT: Tried nmap with those same forced options and it did it's job as opposed to masscan. D:\Nmap\nmap -...
0 votes
1 answer
147 views

USB to Serial Adapter

OS is Windows 7 home edition, with a Prolific USB to Serial adapter. The issue is that after rebooting, Radio BOSS sends the command to the serial port adapter but the device does not recognize the ...
2 votes
1 answer
935 views

How Port Scanner tells Hostnames on LAN?

The port scanner software I use is able to list IP addresses along with their hostnames on my LAN. I am very puzzled how it gets the hostnames. For example, I have a few Raspberry Pi's on the LAN, and ...
0 votes
0 answers
3k views

Same local ports and remote ports with Xming

I run some X11 GUI apps (e.g. Xeyes, Xcalc, Xclock) in Windows Subsystem with Xming as Xserver. By analyzing the ports with TCPView, I find that local ports of X11 apps (Xclient) and remote ports of ...
0 votes
2 answers
489 views

How to open port 465 for user

I have the port open and working for root but it is not open for user XYZ. How can I open the port so that user XYZ can access it. OS : Centos 6.9 Thanks
40 votes
3 answers
85k views

No idea what is listening on port 80 in OS X

I'm on OSX Mountain Lion 10.8.3, and I've freshly rebooted my Mac. I want to start a service (like Apache on port 80), but there is already something going on with port 80: telnet localhost 80 ...
1 vote
1 answer
3k views

If I am using a port at localhost:portnumber do I need to open that port in the firewall of the server?

If I am using a port at localhost:portnumber do I need to open that port in the firewall of the server? For example if mysql will only be accessed locally by an application.
0 votes
3 answers
6k views

LGA1151 motherboards with parallel port

USB-3, Thunder Bolt is today's standard, but I'm seeing a lot of boards still coming with a Parallel port on new motherboards with the LGA1151 socket. Is the parallel port still in use for today's ...
1 vote
1 answer
373 views

Default port for calls with Asterisk

I have AsteriskNOW 11.9.0 with FreePBX 2.11.0.43. I moved Asterisk to a non-standard port number, but now I can call extensions only if I specify the port number explicitly in a callee's number, for ...
0 votes
1 answer
1k views

Map local port to public url address

There is two applications Server/Client I use it locally by configure the client app to access the IP and port of the server App. and get some info. Is there anyway to access the Server App. through ...
2 votes
2 answers
763 views

Firewall blocking IRC client

I'm trying to use the Irssi client to connect to irc.freenode.net in my office. I think our corporate firewall is blocking IRC ports. How do I get around this? I'm just trying to do some Node.js ...
3 votes
4 answers
19k views

iptables firewall only allows internet traffic if source port of 80 is allowed

I am configuring an iptables firewall, currently just to allow http and https traffic. It is working but under a particularly strange rule - I must allow incoming connections with a source port of 80....
0 votes
0 answers
476 views

Serial port modem

I'm trying to send commands to my serial port, I have a modem on my USB and I can't connect with putty or minicom for send AT commands. dmesg | grep tty [265301.769187] usb 2-1: GSM modem (1-port) ...
2 votes
1 answer
675 views

Killing listening process port X without knowledge about name

I would like to kill process that is listening on port 5000. I don't know how to do it because when I put: netstat -nlp | grep 5000 I got: udp6 0 0 :::5000 :::* - so I don't know name of process. ...
0 votes
0 answers
100 views

Forward ports for 2 local applications

I have 2 local applications which communicate over TCP/IP using hard-coded (fixed) port. This works ok when there is only 1 user on a workstation. However, the second user of the workstation can't use ...
1 vote
0 answers
3k views

135 tcp port blocked but still listening

I did: netsh advfirewall firewall add rule dir=in action=block protocol=TCP localport=135 name="Block_TCP-135" rebooted my Windows 10 typed: netstat -n -a | findstr "LISTENING" | findstr ":135" ...
6 votes
1 answer
1k views

Close port which has no process attached?

Based on this answer, I tried to close an open port, the problem is that nmap says that there are 5 open ports, but lsof says there is no current process using those ports, so my question is how can I ...
1 vote
2 answers
2k views

How can the port numbers of all active reverse SSH connections be listed?

I have multiple machines connecting to a single server by reverse SSH tunnels. So, each machine is running a command like the following: while true; do ssh -X -R 19999:localhost:22 www.sern.pro ...
0 votes
1 answer
139 views

Slow HTTP proxy on certain ports

I am using selenium chromedriver with HTTP proxies. I find that when I use them with port 80, I get decent performance. However, when I assign port 8085 I get a lot of slow page loads and timeouts. I ...
9 votes
6 answers
57k views

USB Ports Not Working

None of the USB ports work anymore on my HP EliteBook 2540p laptop which is running Windows 7 Pro SP1. By "not working," I mean if I try plugging in a thumbdrive or external HDD it does nothing ...
1 vote
1 answer
488 views

How to make secure linux server with firewall

I am installed the ufw firewall on linux server and allow necessary ports using ufw but Is there any other rules need to make secure server like DOS, Sync or any others(i've no idea about this) or Is ...
17 votes
6 answers
102k views

how to disable feature that opened port 445 on windows server?

I'm trying to disable services that I do not need, to improve latency and improve security. I found that port 445 is still open by doing telnet on localhost and port 445. As I do not need port 445, I ...
1 vote
0 answers
288 views

How could I find what is blocking outgoing packet with destination port 25

There is something block outgoing packet that has destination port 25 inside my computer. I cannot open TCP connection on port 25 to any IP address including loop-back IP, even I already disabled ...
0 votes
1 answer
2k views

What are these open ports on my XWRT-based Netgear R7000 router?

I recently flashed XWRT-Vortex on my Netgear R7000 router. Doing a local LAN port scan after the flash, I get the following: $ nmap -p1-65535 192.168.1.1 Starting Nmap 7.40 ( https://nmap.org ) at ...
0 votes
1 answer
592 views

3389 Port Forwarding

I'm trying to forward a 3389 port from a computer over to a router, then to a Modem/Router so I can access this through a public IP address. I'm trying to work backwards here and so far I can only get ...
user avatar
8 votes
2 answers
4k views

Why does USB 3.1 only use two of the four available data lines?

Looking at the specifications for USB-C, I notice that there are four SuperSpeed differential pairs for data transfer, as seen in https://en.wikipedia.org/wiki/USB-C#Specifications. The Wikipedia ...
0 votes
1 answer
362 views

Forward incoming connection on one adapter to another adapter?

I have two adapters on a server. For the sake of this example, let's call them ad1 and ad2. ad1, ip = xxx.xxx.x.x (internet connection) ad2, ip = 192.168.1.1 (this system is the gameway for 192....
0 votes
1 answer
882 views

How to find port number in PAT?

In Port Address Translation, PC with Private IP address sends a packet with Destination address as a public IP address to the router. The router changes the Source address to the public router address ...
0 votes
2 answers
90 views

2 Separate Machines, 2 Static IP Address. No connection Outside ISP Network

I have two separate physical machines. The first one is running CentOS 6.6 x86_64, and the second is running Ubuntu 14.04 LTS. (also 64-bit) Here's the issue. Both servers have a direct connection to ...
11 votes
4 answers
41k views

What is binding this port?

Something is serving content on my port 80, but I don't know what process is doing this. Is there any way to find out what process is bound to which port(s)? Update: This is the output of netstat... ...
0 votes
2 answers
10k views

What is that port with a chain-like logo on my laptop? [duplicate]

I found this port on my new laptop (a LG Gram). It is small, about the size of a mini-USB, and has a logo that looks like a chain. I don't have the documentation with me right now. A Google Image ...
0 votes
1 answer
218 views

FTP server data port [closed]

I'm running Filezilla FTP server on Windows 7 machine which i access using FTP client running on Virtualbox'ed Slackware guest. According with in the active mode after the successful connection ...
2 votes
0 answers
473 views

Port forwarding without admin credentials

I have a TP-link router for which I have to forward ports.But I'm behind admin router and I don't have admin router login password.I am trying to forward ports on my router but I do not have admin ...

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