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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Where do I start to troubleshoot this strange activity from my firewall?

I noticed that my firewall yesterday blocked outgoing attempts starting at port 61494 and worked its way up to 62381, making a TCP outgoing attempt at each port once. The remote IP address seems ...
0
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1answer
35 views

How to protect a port from attackers

I want to host a home server(i.e a minecraft one) which runs on port 25565. Is there a way to protect my home internet from attacks while this port is open? Or I should select an more unusual port? ...
0
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0answers
24 views

TCP and UDP do not work with firewall

I can not connect my TCP-Client to my TCP-Server. Here is my Code: http://stackoverflow.com/questions/35661591/tcp-server-does-not-work-with-firewall I have already opened my TCP-Port "8888" in the ...
0
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1answer
128 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. Router setup page. TPG (my internet provider) said port forwarding is possible with them and they don't block any ports. Multiple port checkers ...
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3answers
14k views

Does it matter what UDP port a WOL signal is sent to?

i have seen many WOL instances use port 7 and many use port 9, does it matter? Isn't it just looking for a WOL packet at layer 2 or ethernet?
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3answers
3k 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. ...
1
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1answer
35 views

Are different port numbers assigned for different tabs opened in a browser

I want to know if different port numbers are assigned to different tabs opened in a browser. Since on a network every tab inside a browser is running a different process,there must be some way to ...
0
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1answer
44 views

Why does my browser hang when I visit google.com:8000, but error at google.com:443?

I'm learning about ports and was mucking around. I found out that when I visit http://google.com:8000 (a port I chose at random), my browser times out after hanging for a while. But when I visit http:...
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2answers
10k views

Trying to run Apache, but VMWare Workstation is blocking port 80

When I run Apache server it shows port 80 is busy because WMware Workstation is blocking it. How can I run Apache?
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2answers
2k 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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1answer
23 views

How are Ports Used and Represented in an Operating System? [closed]

How do ports exist in an operating system? Is there some file for every port that exists? And how are the ports then used? Is data in some form directed to be sent to a specific port? I do not ...
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2answers
37 views

random open ports on nmap scan

My machine has the IP address 192.168.1.50 . When i do the following nmap scan nmap -p- -sT -Pn 192.168.1.50 from the same machine, i get at each scan some random open ports. And these random open ...
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1answer
1k views

Why does my Belkin wireless router has eMule port open?

I have a Belkin F6D4230-4 v1 router. When I port scan it with nmap I get the following: $ sudo nmap -sS -A -T5 192.168.2.1 -p- Starting Nmap 5.00 ( http://nmap.org ) at 2010-04-17 11:40 CDT ...
0
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1answer
291 views

Windows Command to check if a remote server port is opened?

I have two Windows Servers.. Server A and Server B. There is a service configured on Server A to listen on port P. Is there a way to check if the port is opened in Windows Server B irrespective of ...
51
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2answers
5k views

Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port?

Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port? Is there a reason or was it is just defined that way?
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0answers
30 views

bsd (osx) pf nat - change source port on outgoing UDP packets

I am running docker-machine on osx. docker-machine is running NAT so when my container send out a UDP packet on port 1812, NAT is translating it to some random port. I am playing around with pf nat (...
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0answers
38 views

UDP port 9987 wont open on my firewall

I have a zywall-usg-200 and i have tried to open ports, i managed to open two TCP ports but the UDP port 9987 fails, cant connect to it. Does anyone have the same problem? Or is it just my firewall
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0answers
88 views

Cannot Connect to server

I'm developing an application, and I need to connect to the server by app through port 5222 (TCP). My host doesn't have a domain name (just an IP address). In my local network I can simply connect to ...
0
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1answer
61 views

I am not able to connect my software with my public IP

please help me in port forwarding. i m stuck in the middle. suppose my local ip is - 192.168.0.103 and public ip is - 49.248.xx.xxx I have D-link DSL-2520U ADSL2+ modem router so here is what i do, i ...
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0answers
22 views

I don't know what kind of port this is [duplicate]

I wanted to find out what the port next to the USB port is called. I don't know the full specification on my laptop but it is a Dell XPS laptop.!
4
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2answers
4k views

Minecraft servers - 1 external IP, 2 servers, 2 ports - avoid specifying port in game - SRV record

I have two minecraft servers, on sub-domains. www.server1.example.com and www.server2.example.com. server1 is port 25565, server2 is port 25566. When users want to connect to a non-default port in ...
2
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1answer
928 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 ...
1
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1answer
134 views

FTP connection error with one service provider

I’ve had FTP access to a number of websites for some years using Dreamweaver on a Vista PC with Norton 360. I’ve just changed to a Windows 10 PC with Norton 360 and transfer the Dreamweaver ...
0
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1answer
64 views

How to set a proxy to disconnect network actions of an application from its configuration?

I'm trying to disconnect some application from network using its proxy configuration. I tested random ip and port values in my Mozilla Firefox browser but Firefox continues to open pages normally. Is ...
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0answers
2 views

Can I tell zenmap to apply a command to all known hosts?

In zenmap (an nmap gui), you can apply various scans, and it remembers the results, keeping a list of hosts you have successfully scanned. Can you tell it to apply a command against all known hosts (...
1
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1answer
196 views

NMAP Always says host is down (when using -Pn it says ports filtered)

I am running Kali 2.0 (Kali sana) and I have problem with NMAP, it everytime says that host is down when i scan it (even myself with firewall off)... When I try online nmap (https://pentest-tools.com/...
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1answer
354 views

Suspicious activity on antivirus detecting port scans

Within 3 hours Bitdefender blocked 4 port scans of different IPs and Countries...I don't know what's happening. Can anyone suggest me what's going on? These are the IPs blocked! 197.89.232.231 121....
0
votes
1answer
149 views

Stop a reverse ssh tunneled port from listening on remote machine

I have a few devices that may get serviced through a server. Since the devices connect through a GPRS network with inbound connections blocked I make them check with the server every few minutes. The ...
93
votes
3answers
84k views

Finding the process that is using a certain port in Linux

I'd like to be able to find out which process is currently using a certain port in Linux. Is there any way to do this?
0
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1answer
127 views

Setting alternative port - what are the best practises?

I'm setting up a jBoss EAP Server (right now on my local machine), in a rather strict security environment. The default port is 8080, which is also the proxy is for the network. What port should the ...
0
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1answer
129 views

Synology Diskstation has two ssh ports after changing standart port on DSM 5

I was trying to change the standard ssh port on my Diskstation, running DSM 5, by editing those two files: /etc/ssh/sshd_config /etc.defaults/ssh/sshd_config and uncommenting and changing the line ...
3
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2answers
599 views

Can’t get Nginx to work on port 80. Works fine on any other port

I’ve just setup Homebrew’s Nginx on Mac OS X 10.11 (El Capitan). If I set my Ngnix config like this: listen 127.0.0.1:8080; listen 127.0.0.1:81; listen 127.0.0.1:75; It’ll work. ...
4
votes
1answer
69 views

mysterious port 80 blockage

Okay, this has really stumped us. This all takes place on an internal LAN - no routers involved. A computer running Windows 7 has an application that serves a webpage for users. It seems to be an ...
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1answer
44 views

VPN tun interface ports are closed

I have an issue with accessing my server of Cryptully chat under vpn. What I did (S - server side, C - client side): S: python cryptully.py -s -p 1242 S: sudo netstat -autpln | grep 1242 tcp 0 ...
0
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3answers
59 views

broken usb port , adapting serial to usb

Dell Inspiron running Vista sp2 has broken USB port; can I obtain an adapter to use off the 9 pin serial port that will convert to USB? If so, will it be reliable or slow compared to USB 2.0?
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0answers
49 views

Forward port 443 on DSL-N55U

I am trying to open port 443 on my Asus DSL-N55U (Annex A). I defined the port forwarding rule with no problem, but the port remains closed from the WAN. I have read that it might depend on the ...
31
votes
4answers
111k views

PID:4 using Port 80

I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my Web Server it says: "Web Server Port: 80 Occupied". So I decided to check what ...
3
votes
2answers
13k views

OSX Lion, open a local port so people on my network can access it

I'm running django's simple HTTP server (using python manage.py runserver). It's currently running on port 8000. How can I open a port on my macbook and allow network traffic to visit my host on ...
0
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0answers
28 views

sony vaio laptop windows 7 drivers got corrupt

I have tried upgrade my sony vaio laptop from windows 7 to windows 10. The upgrade failed and all my windows drivers gone corrupt. Please let me know how to get at least the USB driver running. Where ...
0
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2answers
2k views

Stop listening port 135

I have done following things Navigate over to key: HKEY_LOCAL_MACHINE \ Software \ Microsoft \ OLE At the right column, locate the value "EnableDCOM" and modify the value to "N". [3] Navigate to ...
0
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2answers
29 views

How to port forward for certain domains on OS X?

I'm running Virtualbox on OS X Yosemite and using it for web development. I added lines such as the following to /private/etc/hosts: 192.168.33.1 www.mysite.dev Virtualbox then has these port ...
0
votes
1answer
45 views

port forwarded to my router but not forwarded to my pc

I have forward a port to my router successfully but it is not forwarded to my PC. My router is Dlink, DIR-600m, firmware version:-3.01 and the hardware version is C1. I searched for a ...
1
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0answers
155 views

Is it possible to bind an application to a specific WAN port using a DI-LB604 dual wan Router

What I'm trying to do is bind applications to specific WAN ports to maximize internet usage and prevent applications from getting all the bandwidth as well as categorizing which ISP they should be ...
0
votes
1answer
20 views

How can I change my routers management interface from port 80 to port 81

I have a TL-WR1043 router and I want to port forward a webserver on port 80 but the router is in the way. So how can I change the router management interface from port 80 to port 81? I heard that ...
3
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2answers
586 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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4answers
47k views

How to get a Port to listen on Windows 7?

I have followed the step by step instruction to open a port on Windows 7, setting both Inbound Rules and Outbound Rules to following specification: Protocal Type: TCP Local Port: 55000 Remote Port: ...
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2answers
1k views

Source port 443?

I'm might embarrass myself with this question, because of something really obvious, but I'm puzzled. My home broadband firewall log says it has been blocking incoming TCP traffic with a source (!) ...
12
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4answers
81k views

How can I check which ports are busy and which ports are free on my Linux machine?

Is there any command line command or any other way to find and list out the busy and free port numbers on my Linux machine?
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0answers
175 views

Cannot open ports on my router

I have a server for a game, but i can't open ports, after i open the port on router, "You get signal" port checker says my port isn't open. Before I can port forward and players can join my ...
0
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1answer
288 views

Disable Fortitoken on a Fortigate Firewall

I made an error while configuring my admin account on the FortiGate 60d and enabled forti token for 2 step authentication. Thing is I enabled the wrong token and I do not have that device with me. Now ...