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23
votes
3answers
53k views

Get a list of Open Ports in Linux

I need a Linux command to list all free open ports for use in an application lsof -i TCP| fgrep LISTEN Does not seen to be helping as the Ports it lists are not necessarily free for use. How do I ...
18
votes
5answers
4k views

Is there any difference between front and back USB ports?

I bought a flash recently, In the warranty card there was a caution saying "Always use USB ports on the back of the case" . Is there any difference between front and back ports? They are all connected ...
8
votes
3answers
7k views

How to find exe listening on port?

I try with netstat -ab -p tcp -n and among the results get: TCP 0.0.0.0:47001 0.0.0.0:0 LISTENING Can not obtain ownership information I am running as administrator and ...
6
votes
3answers
17k views

What is USB root hub?

What is a USB root hub? My computer shows three USB Root Hubs in Device Manager. The first USB root hubs show four ports, the second shows three ports and the third shows eight ports are available. ...
5
votes
4answers
7k views

Safe to use high port numbers? (re: obscuring web services)

I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to ...
5
votes
1answer
10k views

How can I open listen ports on an Amazon EC2 instance?

I'm using Amazon EC2 micro instance with Ubuntu 11.04 on it (official AMI by Canonical). I have created a new security group for this instance: Inbound: 22 (SSH) 0.0.0.0/0 80 (HTTP) 0.0.0.0/0 ...
4
votes
3answers
916 views

Why don't p2p connections need open ports?

I mean, if someone is downloading a file from me, doesn't that means that I'm the host and he is connecting to me? Or am I connecting to him? Either way one of us need an open port, no? I don't ...
4
votes
1answer
7k views

How can I disable these Windows-specific ports?

Let's see what ports are opened by which processes, taking those that are specific to Windows itself: C:\Windows\system32>netstat -anb Active Connections Proto Local Address Foreign ...
3
votes
1answer
674 views

How can I check what outbound ports are allowed in a network?

On some networks (primarily corporate ones), the firewall restricts outbound connections to some port number. The allowed ports generally comprise of port 80, 11, 443, etc. Is there a way I could do ...
3
votes
1answer
90 views

How to forward urls without ports from one machine to urls with ports on another machine

I'm new to sys administration, so I play some things virtually at home. And so, I have one virtual linux with two nodejs applications running there. They listen on two different ports. Lets call the ...
3
votes
2answers
230 views

Blocking ports with iptables

I have a server with multiple interfaces (IPs). I'd like to block all ports on one of the IPs (I don't want to change anything for other IPs/interfaces), but allow outgoing connections from it. For ...
2
votes
1answer
809 views

What does COM Stand for in terms of Serial Ports

In terms of Serial Ports what does COM actually stand for. I can't find any reference to it. (To be clear I am not talking about Component Object Model but the Hardware Interface used in Windows ...
2
votes
1answer
2k views

Netstat -a command : Difference between 0.0.0.0 and 127.0.0.1

When running netstat -a on my local machine, i see ports on the 0.0.0.0 address listening. I would assume that 0.0.0.0 is my local machine, except that i also see 127.0.0.1 listening to specific ...
2
votes
3answers
4k views

NAT vs public IP (and blocked ports)

I have a problem with my ISP. They say that they don't block any ports and I have public IP, while I think these both statements are false. Before I talk to them again (which is really tough when my ...
2
votes
1answer
7k views

How can I disable any TCP/IP port on a Windows 7 machine?

I need help on finding out how to disable any particular TCP/IP port on a Windows box whenever a need arises. I googled before posting the question and I got links to articles mentioning only ...
2
votes
5answers
18k views

How do I limit packet capturing in Wireshark to only a specific protocol?

I would like to listen to HTTP traffic on port 8080. When I start capturing packets in Wireshark, it's flooded by packets using the SSDP protocol on port 1900. I would like to limit the packet ...
2
votes
1answer
54 views

Help with iptables

I recently installed Oracle Linux 6 on a home server, and I've been having trouble with allowing ports past the firewall (iptables). I've tried adding ports with the command iptables -I INPUT -p tcp ...
2
votes
1answer
1k views

What's up with port 8080 on my OSX box?

I thought a web server process I brought up was listening on localhost:8080, and tried to connect to it, but kept getting connection reset errors. As it turns out, I was mistaken and my process was ...
2
votes
1answer
299 views

I want to send email from my Debian server but My ISP block port 25

I have put private server on Debian, I would like to be able to send mail but port 25 is blocked by my ISP. I checked it by opening a telnet connection to another mail server. The good news is that I ...
2
votes
1answer
1k views

FreeBSD 9 ports: How to make quiet installations?

Just wondering how do I make ports installation - without config options (blue) window popup? Assuming that I accept default options of the installation. make install clean
2
votes
1answer
733 views

port 3389 for RDP is listened to by vchost.exe

how do I get port 3389 for RDP to not be listened to by vchost.exe on win7-64 bit? I used a port checker and it says that that port is locked by another program. so I did "cmd\netstat -ano" and the ...
2
votes
1answer
247 views

Do people use dbus, pipes or ports usually for interprocess communication? [closed]

It's hard to find dbus libraries for the programming languages I've been using though the idea looks neat. Sockets are the most supported way but it also eats one of my computers ports and then I also ...
2
votes
1answer
3k views

Stopping Apache from listening in port 443?

Pretty self-explanatory. Is there any way I can make Apache stop listening in port 443 (Https). So that it only listens on port 80 (http)? I'm working on a Windows 7 PC. Edit 1: I installed Apache ...
2
votes
3answers
880 views

Which Ports manager to use on FreeBSD? (8.0 and above)

There is no clear answer which one to use on the net. Tried searching but couldn't dig up anything useful. Also, the user manual mentions them altogether, won't list the advantages/disadvantages, ...
2
votes
1answer
25 views

What are the dangers of unblocking ports to remotely connect to a network?

I am trying to create something like a cloud where I will be able to connect to a device from other networks, apart from my local one. In order to do that my provider must unblock some ports... My ...
2
votes
0answers
122 views

Limit user bound ports to arbitrary ranges

Is it possible to allow user to bind only certain ports? For example, I was trying to achieve this: user1: can bind only on ports 4001 and 4002 user2: can bind only on ports 5001 and 5002 and so ...
2
votes
1answer
119 views

SSH Port closed although forwarded correctly

I'm having an issue with opening my SSH port. Here are the symptoms. Within the local network I can ssh to the machine, including both locally (ssh localhost) and from alternate computers. I have ...
2
votes
0answers
494 views

Port 53 on a Windows 7 machine is inaccessible from LAN

Installed a nice dns filter (Acrylic) on my server running Win7. Wanted all machines on the LAN to use it for name resolution. On the server NETSTAT shows Acrylic is listening on DNS port: UDP ...
2
votes
0answers
168 views

Generate random port traffic windows

Without installing any third party software is there a way to generate random traffic for a port of choice in Windows 2003? I'm testing a few Port Forwards and just need some random test data. I'd ...
2
votes
2answers
653 views

Keyboard partially stops working while playing games

I've recently got back into playing some PC games, however yesterday I started experiencing some weird problems. Whenever I'm inside a game, the keyboard either chooses not to work at all, or it ...
1
vote
4answers
4k views

Send message to specific port on Windows cmd.exe

I'm playing with a program on desktop. It's listening on port 5060. However, I don't have anything sending to this location/host. If I open my laptop's command line, is there a way to send a ...
1
vote
1answer
2k views

Can't free up port 80, no matter what I try

Trying to get WAMP working again, and testing to see that the Apache server is working. It keep saying port 80 is being used by Server: Microsoft-HTTPAPI/2.0 - I've removed IIS, I've removed SQL ...
1
vote
2answers
88 views

What does it take to get software added to FreeBSD ports system? [closed]

What does it take to get software added to FreeBSD official ports system?
1
vote
3answers
6k views

What is the range of ports that is usually used in the traceroute command?

I wanted to know if there is a range which is usually used for destination port that is used in traceroute command. Like the starting address for destination port is 33434. but is there some standard ...
1
vote
2answers
186 views

Cross-platform implementation of GNU tools? (Preferably Java)

I'd like to have GNU tools available on multiple platforms, behaving the same. I know there are ports, like http://gnuwin32.sourceforge.net/, but they are different from what's supported by the linux ...
1
vote
3answers
10k views

Ports for NAT'ed Windows share

Simple question: I have a NATed Linux at home that hosts a couple of samba shares. What Ports should I forward from the router to the Linux box so as to be able to access those shares from the ...
1
vote
3answers
2k views

closing open TCP ports under WinXP SP3

I must confess I have not been very security-conscious over the last few years, and I just did an NMAP scan of my computer to see how it was doing. The results amazed me. There were literally ...
1
vote
1answer
771 views

OSX Mavericks: How can I make a webserver launch at boot and listen to port 80 without running the webserver as root?

According to Apple's launchd documentation: [launchd] Eliminates the primary reason for running daemons as root. Because launchd runs as root, it can create low-numbered TCP/IP listen sockets ...
1
vote
2answers
533 views

Why can't nc / netcat sniff http port traffic easily?

I'm NOT looking for advice such as "try wireshark." I'm trying to understand what netcat is and isn't. When I try to listen (-l) to port 80, it says "address already in use." Can netcat not listen to ...
1
vote
1answer
7k views

How to change mysql port

I'm using wampserver. And suddenly mysql wouldn't work. I checked curports from nirsoft and it has red highlight on it. What does it mean?How do I solve this so that I could use mysql again. I'm ...
1
vote
1answer
6k views

Accessing non-port80 web server using IPv6

In a normal IPv4 network, I can go into any browser such as Firefox and browse a server on a IPv4 address not hosted on port 80: http://192.168.42.6:8080/ This accesses the server on port 8080 on ...
1
vote
1answer
42 views

How to customize flash player ports

Is there a way to change flash player ports? I've already searched but without success, all the tutorials usually refer to flash player server.
1
vote
1answer
756 views

Difference between port types

What is the difference between the three port types; Well-known, Registered and Dynamic? Namely, the difference in usage and port numbers associated with each category. Currently I understand the ...
1
vote
1answer
235 views

OS X: how to figure out what prevents L2TP/IPSec from running correctly

It seems that an old installation of Cisco Anyconnect prevents the OS X built-in L2TP/IPSec client from running (I posted a question here: OS X 10.7, can't log into any L2TP VPN server, but didn't ...
1
vote
1answer
139 views

Open Ports - Strange Errors

I was doing an open port check 1-65535 on my external IP from an online tool and I could see 5 open ports! When I opened one of them in my browser myip:3541 and I could see only this response: ...
1
vote
0answers
115 views

How to block an incoming port to a router?

Recently there have been a lot of people cheating on Xbox Live using a modded Xbox and a networking service called Xbox Live Stealth which allows them to bypass the Microsoft servers so their Xbox's ...
1
vote
0answers
150 views

How to configure Jenkins to run on port 80

How can I configure Jenkins to run on the HTTP port 80, only accessible to a certain Apache virtual server only on a specific subdomain? I have one virtual server: business.com running on the server. ...
1
vote
1answer
858 views

FreeBSD portsnap fetch fails

This seems like a really straightforward problem, but I haven't had much luck looking around the internet so far. (A couple message boards are talking about it, but they don't offer any solutions.) ...
1
vote
1answer
122 views

Cannot SSH into ANY host (outgoing) on entire local network

I'm having a rather strange issue with my network here, and I'm hoping you guys might be able to help me out. As of recently, over the past few weeks or so, I've been noticing some strange problems ...
0
votes
3answers
56 views

Why must we supply a port number in addition to an IP when sending a request?

I have a decent understanding of the practical use of ports and how they work. However, I have a few questions I would like to clear up. What happens if we send a request without specifying a port ...