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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What ports does WeChat use to transfer data?

I want to block the messenging service, wechat, on my netgear router. Does anyone know the TCP/UDP ports that wechat uses to communicate? WeChat is a Chinese messenging application developed by ...
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Multiplatform: Is it possible to perform network scan for a certain open port on a certain IP address with just one click?

When I want to scan for a certain network's open port (say 8080) in a certain IP address (say 111.222.111.222), I go to http://www.t1shopper.com/tools/port-scan/ And I fill the fields port ...
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648 views

Using Telnet: Port number

With using telnet I used port 25. Example: telnet x.x.x.x 25 I had another server today that used port 23 instead. For the future, how would one easily know which port to use? Does this port ever ...
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2answers
232 views

Torrent ports and firewalls

I use this uTorrent program, under its settings 'Listening port' I set up a port of 46301, and also open that port in firewall. But whoever connects to me to leech, they connect to random ports ...
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1k views

Xampp error, port 80 in use with PID 4 in virtualbox

I noticed there is a lot of information about port 80 errors with xampp, however, there is not much information about this error on virtualbox. On my main computer, xampp works perfect. On my ...
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1answer
3k views

Port forwarding with IPTABLES and VBox

I have a small problem with getting a proper configuration of iptables under Ubuntu. But before, let me describe the network configuration: I am using xDSL line terminated with modem+router+DHCP ...
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1answer
10k views

Unable to connect to the MKS: Failed to connect to server xxx.xxx.xxx.xxx:902, the port is closed

I have a server with Vsphere ESXi 5.5. when i try to start a virtual machine with the vsphere client i get this error: Unable to connect to the MKS: Failed to connect to server 172.16.63.3:902 and ...
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1answer
374 views

Reinstalled Windows 7 - Now cannot connect to any activation server or Microsoft Exchange

I reinstalled Windows 7 this morning, and now I am unable to connect to any activation servers for any Adobe software, and I cannot connect to Office 365 Microsoft Exchange server in Outlook 2013. ...
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7answers
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How to “restart/repair” an USB port?

My laptop has two USB ports, but one is broken, so I use a USB hub in the other good USB port. In that USB hub, I use a mouse and keyboard. Suddenly, that USB port doesn't detect the mouse and the ...
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1answer
83 views

How can I check which ports are in use from the Linux command line? [duplicate]

I'm running a Node.JS application and need to figure out if something is using a certain port. How can I do this from the linux command line?
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83 views

Port forwarding does not work

I am connecting to office network through VPN. I have two servers A and B. I have ssh/tomcat access to A through VPN but not to B. When I ssh into A, from there I can ssh into B. Also, B is running ...
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1answer
327 views

Opening a port on CentOS server not working externally?

I am trying to to setup a Ghost blog instance on port 80 of my CentOS 6 virtual server. There are no pre-installed web servers occupying port 80. If I run Ghost in production mode as a background ...
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1answer
703 views

PID not shown under Services in the Task Manager on Windows 8

I'm trying to run a program that defaults to port 9000 but there is an unknown source using that port. I found the PID by using, netstat -aon | more and went to the task managers service tab ...
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5answers
2k views

Cannot Delete Unwanted COM ports - Windows 7

I recently installed a Cannon wireless printer for temporary use, the drivers of which set nearly all my COM ports to be constantly in-use (an occasionnal bug noted in the ReadMe after installation ...
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1answer
222 views

After recover sshd_config on my VPS my TeamSpeak 3 client can't connect with server

I'm destroy my default sshd_config file in /etc/ssh/ on my VPS and I'm recover this to default one. After this I'm trying to connect with my TS3 server on this same VPS. OS says me TS is ON and ...
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1answer
90 views

Test connection to a port without actually connecting to it

I have a python socket server (single-threaded, accepts only one connection) running somewhere. I connect to that port and do my things. How can I detect whether port is open or closed without ...
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2answers
331 views

How to list all hosting services on Windows 7?

I cannot host on port 80, because there is an application on the background, which hosts on port 80. How do I find out which program it is?
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2answers
7k views

How to access NodeJS server on LAN?

I'm not the most knowledgeable guy ever with networking, but here goes... I've created an application with NodeJS and I'd like to test the application on my LAN with my family. The application ...
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1answer
2k views

Netcat error: Can't grab 0.0.0.0:80 with bind

When I tried to listen on port 80 in Windows 7 with netcat, I get this error: C:\Users\sashoalm>echo "hello, world" | netcat.exe -l -p 80 Can't grab 0.0.0.0:80 with bind On the other hand, ...
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27 views

Bad Results from Port Check Sites

I'm not a network expert, though I know how to set up a static IP and forward ports. I've always wondered how port checking sites like http://ping.eu/port-chk/ work, because whenever I try them on ...
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0answers
443 views

'fail to add torrent' error nexus 5

Trying to use torrent download on nexus 5 modded rom slimkat 4.4. Keep getting error ~ 'falied to add torrent from source target'. Tried using utorrent and ttorrent-lite, and have not had any success. ...
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25 views

USB port cut on

I need to use my computer to charge several items. If I leave my computer for any length of time it shuts down Of course the things charging stop the charging process and I have t cut my system back ...
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420 views

Port forwarding on Parallel Desktop

My situation is like this. I have a Windows 7 VM run by Parallel Desktop, on which I run ASP.NET on localhost:1240 (Visual Studio development server). Is it possible from my host machine (OSX 10.9) to ...
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1answer
2k views

Why can I not connect to a reverse SSH tunnel port remotely, even with GatewayPorts enabled?

I require constant SSH access to a host in our department, whose IP address is dynamically allocated. I've set up a remote SSH tunnel from the target host to one of our hosts that does posess a static ...
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2answers
1k views

I have 2 computers with Linux, how can I send with ftp files from computer1 to computer2 (shell command)?

I have 2 computers with Linux. How can I send with ftp files from computer1 to computer2 them (shell command)? Steps that I think should be done (miss shell commands): Find inner IP address of ...
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2answers
214 views

Port Forwarding a Specific Port (e.g. 22)

I'm still confused about establishing an SSH connection (port 22) between two computers on different internal networks. For example: I am on my computer with internal IP address IIP-1, connected to ...
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661 views

Installing and running two postgresql versions on different ports (or two instances of same server)

I have postgresql 9.1 installed on my machine (Ubuntu). I need another postgresql server that would run next to the old one. Exact version does not matter, but I'm thinking of using 9.2 version. How ...
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312 views

UDP port binding to loopback interface

I've been trying to play a video game in multiplayer, but after trying a lot of time, I begun to realize there was some problem with my loopback interface (Windows 7) I have UPnP activated in my ...
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1answer
202 views

Ubuntu + SSL ports + AVAST

I have an interesting problem with communication via standard SSL ports. Fresh installed Ubuntu 14.04 server + Postfix + Dovecot, SASL authentication provided by Dovecot, self-signed certificate ...
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1answer
1k views

How to forward blocked ports by ISP

So I've been trying to setup a TeamSpeak 3 server on my pc but ports (9987,10011,30033) are blocked by my ISP, I've contacted them to unblock them but they didn't accept, and it's the fastest ISP in ...
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260 views

Can't connect to a game over remote LAN

First of all I want to say that I'm not entirely sure if this question can be asked here. If it can't, then please tell me and I will delete it. There's this game called Killing Floor, which can be ...
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1answer
477 views

Where to place a port-mirroring switch for home network monitoring

I want to start monitoring traffic that goes in and out of my home network. I'd like to collect information like bandwidth usage and (specifically) HTTP requests from home computers to websites. From ...
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81 views

how does the software firewall affect the hardware network card?

I am waking my computer up by sending magic packets. But if I close UDP port 9 from windows firewall, my computers is not booting. And also, the lights on ethernet port are off. It looks little too ...
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1answer
336 views

Use of ephemeral port for server

In general ephemeral ports are used by clients when establishing connection with the server. For example: Server listens on port 80 A client (browser, FTP client, bittorent client) send a request ...
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3answers
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net use and Windows 8.1

I have a script that in run by some application. The script adds a shared printer to lpt1 port, then sends a file to it so it get printed then removes the printer from the port: Everything works fine ...
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1answer
286 views

How to find what's listening on specific port in Win7?

I'd like to find out what's blocking port 80 on my system. I've found the answer here but... as the result I get "couldn't not determine owner" (or something like that - I use Polish version so exact ...
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1answer
29 views

Port forwarding with two routers?

Can someone walk me through port forwarding with two routers, I will post screenshots as needed. I've tried many tutorials online and I can't seem to get it to work.
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2answers
534 views

Netgear WNDR4500 listening on port 80

I have a Netgear WNDR4500 that I use for my home router. I also have my own domain with a subdomain point to my IP. I happened to browse to it today and noticed the management console was listening ...
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How do I setup my web browser to default to alternate port for web development

I would like to setup a development copy of my site on another port in order to develop it in exactly the same conditions. Is there a way to setup my browser or is there a browser capable of ...
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4answers
264 views

How do I forward a port accessible to the world on my Mac?

I realize that there's a lot of info out there about port forwarding, but here's my specific situation. I need to use Remote in (via VNC) to my Mac. By default, the Mac Remote Sharing server listens ...
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3answers
7k views

Source Address / Source Port vs Destination Address / Destination Port

I am new to TCP/IP and trying hard to learn basics. Well, I really wonder about inbound rules and outbound rules of Firewall and concept of source adress:port, destination adress:port. For example I ...
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53 views

Hiding port number from address.

I have centos 6.5 running some web apps. Currently due the following port forwarding rules, I am only able to access my public content using 127.0.0.1:8080/ Is there anyone to just use 127.0.0.1 ...
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1answer
897 views

Windows Firewall inbound rules still blocks ports

I applied inbound rules for port: 1935, as well as outbound. When I check on canyouseeme.org, it says it (port 1935) times out. When I completely turn off Windows 7's firewall, it works without a ...
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0answers
4k views

Opening port 8080 on Windows firewall

I am not sure if I am just missing a trick here and it will be something rather simple, or if I am trying to do something that just isn't going to work.. Anyway, I have an asp.net site and I am using ...
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1answer
55 views

Blocked port - no process

Working on a Linux Debian machine. When trying to start Tomcat7 a warning about port 80 being block is thrown. Furthermore, the deployed webapps cannot be accessed (404 error). Tried to figure out ...
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1answer
158 views

Is there any reason to use serial port over parrallel port

Serial Port : Serial communication takes place asynchronously, meaning that no synchronization signal (or clock) is required: the data may be sent at random intervals. In return, the peripheral must ...
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1answer
123 views

How to forward a port to a DHCP client?

The following approach works for me. Say my local ip address is 192.168.1.136, I am able to open the port 63102 using the method illustrated in the following image. My issue is, if I configure my ...
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772 views

How can I open port 3690 (svn) to my network?

I've set up subversion about a year ago and have been using it with no problem, checking in files almost every day and updating them on another system on my network. For no apparent reason, it ...
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1answer
307 views

Should a port scan from the WAN side return any open port on a new router (TP-Link ER6020)?

I purchased a new router (TP-Link ER6020), turned it on and connected my computer to it. The router is running in NAT mode, I did not change a setting (despite providing dsl authentication details). ...
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1answer
112 views

How can I check for externally-open ports on a given server?

I need to programatically determine whether a given port on the server that my script is running on is open from the outside world. I'm working under the assumption that the only reliable way to ...