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.

learn more… | top users | synonyms

1
vote
0answers
28 views

Mikrotik RouterOS FTP protocol routing

I have Routerboard 951Ui-2HnD and I am using it to merge/combine two internet lines wan1 and wan2 and it's working fine but I am facing a problem when I am trying to connect to any FTP server or ...
0
votes
1answer
37 views

Can two different applications bind the same port on a host if they use different protocols?

my question is quite clear I think. If two applications use different transport layer protocols (e.g. TCP and UDP or something else) can they open the same port number? How does the OS do the ...
-4
votes
3answers
66 views

What exactly is a network socket? [closed]

I've heard a lot of different definitions online, and having trouble understanding what a socket is. It'd be great if someone could shine a light where it's all dark for me.
1
vote
1answer
63 views

Port forward Apache behind router and modem

I have a D-Link DSL-321B modem and an Asus RN-N12E_B1 router. The modem is connected directly with the internet. The router is the only device directly connected to the modem. My computer is ...
42
votes
4answers
6k views

Do web browsers use different outgoing ports for different tabs?

In a web browser that supports having multiple tabs, such as Firefox, do different tabs that go to different website domains use a dedicated port for each domain?. Or does the browser use a single ...
0
votes
0answers
23 views

Port not accessible

Am using AWS windows EC2 instance. I set the inbound rules in the machine to open all ports for public access. I installed IIS, and XAMPP in 8080 port. Now I could use 123.234.345.456 to open IIS and ...
0
votes
1answer
54 views

Cisco RV320 cannot portforward same port twice

I'm trying to port forward the port 34197 to 192.168.1.100 and 192.168.1.103 on my cisco rv320. Unfortunately in this router the ports are different services, and it won't let me add the same service ...
0
votes
0answers
79 views

How do I get my nginx server on the internet?

I have a personal website and it's very small, therefor I don't want to pay for it be hosted online. After a few days of research I decided to install vmware with linux ubuntu-server 14.04 with an ...
0
votes
0answers
33 views

Teamviewer over SG300-52 52-Port without any others traffic

I have a VLAN1 IP 172.16.0.65, Subnet 255.255.255.244 and a VLAN2 IP 172.16.0.129, Subnet 255.255.255.244. I have set the switch to Layer 3. All I want is close all traffic between PC1 IP 172.16.0....
0
votes
2answers
47 views

Apache installation errors “only one usage of each socket address <protocol/network address/port ”

I get an error message when I try to run httpd.exe. I have tried to resolve port conflicts - I uninstalled skypee, SQL Server Management studio and SQL Server Business Intelligence development ...
0
votes
0answers
35 views

Start router via RJ11 port and cable

What commands one need to send to a router, with the RJ11 cable in a RJ11 port to imitate a broadband connection?
-1
votes
2answers
101 views

Can't telnet to a Linux port

There is the following listener: telnet -na | grep 8000 tcp 0 0.0.0.0:8000 0.0.0.0:* LISTEN I can do telnet 1.2.3.4 8000 from the 1.2.3.4 server and it connects, but same command from ...
0
votes
0answers
33 views

continuous Port Monitoring and logging in Linux VPS

Here I have faced a problem with my ISP. I have a Linux VPS , well configed for my company as a web and mail server. now I am facing the problem! Every time I send Emails from my server the Over ...
1
vote
1answer
21 views

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
votes
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
votes
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
votes
1answer
123 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 ...
1
vote
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
votes
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:...
-3
votes
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 ...
0
votes
2answers
36 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 ...
0
votes
1answer
275 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 ...
1
vote
0answers
29 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 (...
0
votes
0answers
37 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
0
votes
1answer
60 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 ...
0
votes
0answers
87 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
votes
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.!
0
votes
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
vote
1answer
165 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/...
0
votes
1answer
321 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....
1
vote
1answer
124 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
votes
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 ...
0
votes
1answer
122 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 ...
-1
votes
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
votes
3answers
58 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?
0
votes
0answers
47 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 ...
0
votes
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
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 ...
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 ...
0
votes
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
votes
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
258 views

Port 80 used by Microsoft-HTTPAPI/2.0

The port 80 is used by Microsoft-HTTPAPI/2.0 and cannot be stopped. I have tried many solutions, but no one worked. Here is what I have done. Also, here is what is on the page : Not Found HTTP Error ...
0
votes
0answers
59 views

Read data from COM port

I am trying to read data from device(http://www.genee-india.com/interactive-whiteboards/genee-powerboard/) wirelessly. Port Details:. com port Silicon Labs CP210X USB to UART Bridge(COM5). ...
1
vote
1answer
125 views

Port Forwarding on a dd-wrt Router

I want to be able to forward port 5678. Here's my equipment and details: Modem: ARRIS SURFboard SB6121 DOCSIS 3.0 Cable Modem Router: Cisco Linksys E2000 DD-WRT v24-sp2 OS: Windows 10 ISP: Cox ...
0
votes
1answer
123 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
votes
1answer
66 views

Create a personal VPN at home to use with specific ports

I use a network where I'm allowed to use only port 80 and 22, so I can't use many app I need, I thought about VPN and more specifically I thought of using my Raspberry Pi as VPN server (I know it ...
1
vote
0answers
49 views

connecting jenkins vm to github with webhook, Windows 10

I have a Virtualbox guest VM running with Jenkins, in my Windows 10 host. The VM is exposed through a bridge, and I can access it in my browser at my Wi-Fi interface ip address. I have set up a ...
0
votes
0answers
64 views

Block Port 4000 on Window 7

On Windows 7 Enterprise 64 bit system Need to block Port 4000. Under system Firewall by creating inbound rules and outbound rules have blocked port 4000 but its not working. Need your advice. System ...
0
votes
1answer
954 views

Adding thunderbolt port to windows laptop

I wanted to ask if it is possible to add a thunderbolt port via an adapter or some other way to a windows laptop.Thanks
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 ...