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 open port 8080

I'm running a VmWare with an application under JBoss starting up on port 8080. I'm able to access the app from outside the VM if the iptables are off. However, I must turn on iptables due to some ...
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0answers
15 views

CS:GO SRCDS and iptables (firewall)

I have very strange problem. This morning I wanted download, install and host small server for CS:GO on my VPS. I used this tutorial: ...
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0answers
8 views

How to open port in windows for node.js server [on hold]

I have my app running on http://192.168.1.6:3000/ . I want to open it on my phone. It doesn't work. When I turn off the firewall, it works! But is there a safer way. I even tried opening up the 3000 ...
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0answers
828 views

Port forwarding on a Huawei EchoLife HG8245

The problem is port forwarding in my EchoLife HG8245 router. I am able to port forward, and I know it works. But after some time I've came with the conclusion that my router only accepts 1 connection ...
0
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1answer
25 views

Where do port knocking services listen for incoming knocks?

I'm trying to understand how a port-knocking daemon is able to monitor for knocks, independent of the firewall rules (e.g. accept/drop/reject packets). I've installed knockd, which listens for lets ...
39
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9answers
117k views

Manually closing a port from commandline

I want to close an open port which is in listening mode between my client and server application. Is there any manual command line option in Linux to close a port ?? NOTE: I came to know that "only ...
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0answers
21 views

What is the equivalent of Port Forwarding command in Mac Os x Yosemite

ifconfig eth0:0 192.168.1.215 netmask 255.255.255.0 /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE /sbin/iptables -A FORWARD -t filter -i eth0-m state --state ESTABLISHED,RELATED -j ACCEPT ...
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5answers
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What is ::: in the Local Address of netstat output?

This is the output of netstat -tulpn that I get: tcp 0 0 127.0.0.1:2208 0.0.0.0:* LISTEN 2055/hpiod tcp 0 0 127.0.0.1:631 ...
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4answers
13k views

Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...
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2answers
7k views

Can't access my IP camera over the internet

I have an EasyN F3 (F3-M166) IP camera. It works fine on local IP address, but I can't access it over internet. This is what I have done step by step: I configured the local IP (camera_ip) and port ...
0
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1answer
19 views

List all open sockets in /dev/tcp/localhost/

Is it possible to list all open sockets in /dev/tcp/localhost/ on a Linux machine? I want to list all sockets where the following command would return 0: timeout 2 bash -c "cat < /dev/null > ...
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0answers
17 views

is it ok to keep port open so that client does not close its connection [migrated]

I am trying to write a Java code for client and server and I don't want to close the connection from both the ends. i.e. both the server and the client should remain open until it is manually closed. ...
0
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1answer
48 views

Firewall status: “Allowed, Restricted” on a port

I'm trying to run something on my localhost through a port (8080) but I am getting a 404. It should be working properly but I'm not sure why. In my Resource Monitor, under Network -> Listening ...
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1answer
3k views

How to open a port for all users: NSA 2400

I'm trying to open up port 8332 for all users behind my firewall but can only find instructions for doing so for a single IP address. How do I make sure all my users can use a specific port? I've ...
2
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4answers
2k views

Which Powershell Function could check whether a certain port is in LISTENING state on localhost?

Introduction Aim: to check whether a port is in LISTENING state on localhost by using a PowerShell function The following command: New-Object Net.Sockets.TcpClient.Connect("127.0.0.1",10389) ...
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3answers
3k 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 ...
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3answers
42 views

Checking open ports on a netgear router

I'm having troubles connecting to ftps via Filezilla. They told me it could be router ports. Some say 21 port (exit traffic?) is always open, some say it's closed. How do I check if it's open? If it's ...
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2answers
1k views

What ports/protocols are used by Windows' “Computer Management”?

I usually connect to other Windows computers on my network using My Computer > [right click] > Manage and then Computer management > [right click] > Connect to another computer. I would like to know ...
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1answer
51 views

Amazon-EC2 ports not opened despite Security Groups and iptables configuration

I just rented an Amazon EC2 server, made to host a node.js app which listen to client on port 9001. I did configure the Security Groups and added inbound and outbound rules on this port. There is no ...
0
votes
1answer
2k views

Firewall open ports for vSphere

I need to open ports on a firewall, so that a client could 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 ...
0
votes
1answer
10 views

change audio output ports from mic to front

Lately my front audio jack has died. The microphone jacks still works seamlessly and I would like to remap the front speakers output to the microphone if it is possible. I use Ubuntu and I have Aspire ...
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0answers
19 views

port forwarding and hiding your IP [duplicate]

can i hide my public iP address by using the port forwarding ?
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0answers
4k views

Simple way to open Port for Transmission for a Mac Snow Leopard

I am a complete noob when it comes to TCP/IP, but would like to open up my port for the Transmission bit torrent client on Snow Leopard Mac. Also, I am based in the UK if that has any relevance.
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1answer
299 views

Nmap shows 554 and 7070 open on EVERY machine even when they are closed/filtered

Every single machine I scan shows port 7070 and port 554 as open regardless if the ports are closed/filtered. It will still show those two ports as open even if the target is offline (and the scan is ...
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2answers
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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 ...
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0answers
16 views

Finding ports that are not showing up as available

Disclaimer: I have looked at the other threads on "Find processes using a port" This is in reference to a question on stackoverflow ...
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1answer
24 views

change port no on which tomcat is installed in ubuntu using SSH

I am accessing an Ubuntu instance through SSH, I installed tomcat7 on it. By default installed on port 8080. I need to install on port 9090, is there a way to change the port? Or how to install tomcat ...
7
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4answers
18k 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... ...
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2answers
94 views

Testing a Firewall against outgoing UDP ports

I'm trying to test which outgoing ports are allowed through a firewall. At the moment I can do this for TCP by port scanning portquiz.net (which is a server with all TCP ports open) from inside ...
11
votes
3answers
6k views

Netgear router listening on port 32764?

I've got a Netgear DG834G running firmware V5.01.01. From the LAN side, if I port scan it, it's listening on tcp port 32764. Trying to telnet into this port gives me the response ...
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0answers
23 views

UPnP Port Forwarding doesn't appear to forward my telnet port

I used upnpc to set up some forwarding rules for HTTP and TELNET (I'm aware of the security risk, it's a test): upnpc -a 192.168.0.30 23 23 TCP upnpc -a 192.168.0.30 80 80 TCP Everything looks OK ...
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2answers
86 views

Linux command get unused port

I'm looking for a command or script which returns an unused port on my ubuntu linux system. I have look on internet and the only thing I find is about the used/Listen port with the nestat command. ...
0
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1answer
977 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 ...
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0answers
32 views

Opening port 80 in router and Tor network doesn't work

I closed port 80 in my router . now when I type "192.168.1.1" to browser, I can't access the page of router settings to change settings and open port 80. Also 443 , 8088 ports open and 8080 has been ...
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0answers
13 views

Opening Gre port

Hi I've constructed VPN server.(My server is windows server 2012 datacenter.) But it error keeps on going when I try to connect from windows 8 and android. It says GRE protocol needs to be opened. ...
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0answers
17 views

What is the client's “open to LAN” port range for Minecraft? [duplicate]

Does anyone know what the port range for Minecraft LAN is? it appears to be a random port every time, but there must be some guideline (i.e. min - max). As far as I can tell min is ~5000 and max is ...
0
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2answers
25 views

Blocking ports without any firewall?

I want to close ports on my windows computer without using any firewall or similar software? Also i only want to open them when i use an explicit command. I didnt tried anything because i have no idea ...
0
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0answers
26 views

If nmap reports a port is open, does that ALSO mean a service is listening on the port?

I have a Thompson TG585v7 router/firewall whose firewall is configured to FORWARD several ports to a computer X54 within the LAN. These ports are in the range 1024 through to 2500 That X54 ...
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0answers
20 views

Check if ports are open for talking

I have a software (HP BSM) installed in a Windows server 2008 R2 Std This software needs to "talk" through a specific list of TCP ports and "listen" through other TCP ports. How can I know/check if ...
3
votes
3answers
3k views

VNC via SSH tunnel: channel 3: open failed: connect failed: No route to host

I used to connect from A to a system B through VNC with SSH tunnel via C. I do the following: In B I start the vncserver: vncserver and let's say I get the :12 In A I open the ssh tunnel: ssh ...
0
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0answers
40 views

Port forwarding WAMP server (for external access)

Basically I am having trouble allowing people to access my local WAMP server through the internet, I am running a HG523a Huawei router but I'm not sure on my next steps. I have set my config files to ...
0
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0answers
15 views

How to diagnose unconnectable port from client side?

I have a machine that can't connect to a certain port number on a server. I've disabled all firewalls and security software. It can connect just fine to 80 and 443, but not 7777. Is there a tool or ...
5
votes
7answers
2k views

Dos and/or Windows versions of Unix SCRIPT command

Back in university, when we had to submit an assignment in CS, we would have to perform a series of steps including running script, date, whoami, etc., and then running our program. The script ...
0
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0answers
25 views

Configuring Bittorrent

I have used Bittorrent without problems for the past year. Then a couple of weeks ago I changed my internet provider (now I have Fastweb.. I live in Italy) It is much faster, but Bittorent does not ...
50
votes
6answers
114k views

Test if a port on a remote system is reachable (without telnet)

In the old days, we used telnet to see if a port on a remote host was open: telnet hostname port would attempt to connect to any port on any host and give you access to the raw TCP stream. These ...
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0answers
9 views

Redirect outgoint traffic on port to incoming on other port

I would like to redirect packets that are send from localhost to some other port in network, to other port on localhost. Example: Application sends data to 145.125.130.20 port 3554. I would like to ...
0
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1answer
29 views

open port with ip-adress

i want to get access to my server from network. netstat -an | grep LISTEN tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 ...
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3answers
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How to check if TCP port 1723 and GRE protocol port 47 are blocked or not in Windows 7?

I am trying to connect to a VPN Server (BestUKVPN) but I'm failing each time I try. I get a "691 error" but the username and password are OK. I searched and I am told that "port 1723" or 'GRE ...
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3answers
138 views

Some program occupy port 80. What is it?

I am trying to run netstat and this is what I got Proto Local Address Foreign Address State TCP 127.0.0.1:5550 TOSHIBA-PC:49319 ESTABLISHED TCP ...
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0answers
22 views

Change HTTP/S ports in OS X Server?

I am setting up OS X Server on a local computer (for managing a few devices.) I contacted my ISP to allow me to set up port forwarding, and they said that incoming ports 80 and 443 are disabled. Which ...