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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-1
votes
2answers
85 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
1answer
44 views

Use two services/protocols on port 80

i ran into a problem today. I'am running a home webserver with FTP and everything and want also be able to connect to XBox live. The problem is (maybe some of you know) that Live uses port 80 (which ...
0
votes
0answers
96 views

Remote Login to Asus RT-AC87U Router

When I try to "remotely" login to my ASUS RT-AC87U Router, I'm getting below message and I'm not sure what to do? External IP: 17x.xxx.xxx.xxx Internal IP: 192.168.1.xx to login I use: ...
3
votes
1answer
90 views

Can't start IIS website on port 443, even though netstat shows nothing listening on 443

I have to bind my IIS website to port 443. No other port is allowed in my case. In IIS Manager I've bound Default Web Site to port 443: But when I try to start the website it fails with: However ...
58
votes
13answers
189k 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 ...
0
votes
0answers
15 views

How to change transmission-daemon port?

In /etc/transmission-daemon/settings.json I changed "rpc-port": 9091 to "rpc-port": 69, but since then I've been getting ERR_CONNECTION_REFUSED when I try to open website:69. Earlier, I was able to ...
0
votes
1answer
25 views

Trying to find out what's wrong with our external hard drive?

We have had the external hard drive since 2010 and we've had ongoing issues with it for the past 2 years. I'm hoping I can find out exactly what's wrong with it. Details: BUFFALO 500GB Hard Drive ...
1
vote
0answers
22 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
0answers
64 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
1answer
29 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
65 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.
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 ...
1
vote
1answer
59 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 ...
0
votes
0answers
22 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
40 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 ...
3
votes
0answers
3k views

How to close suspicious port 999 garcon, is it malware?

On Mac OSX, I ran the command nmap localhost and I found I have this suspicious open port: 999/tcp open garcon Then I tried to see if there is an associated process, but nothing shows up with ...
81
votes
8answers
258k 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 ...
0
votes
2answers
2k views

Mystery port on my Samsung laptop (NP700Z5C)

What is the port in the picture of my Samsung Series 7 NP700Z5C? It's called a "Display Port" in this image (not from Samsung, admittedly), but it's clearly not (the Samsung documentation even ...
0
votes
1answer
3k views

Port 80 already in use after Windows 10 upgrade

I upgraded from Windows 7 to Windows 10 yesterday. I tried to launch EasyPHP and Apache didn't start because the port 80 is already used by System. I know that I can change the port used by Apache, ...
1
vote
0answers
850 views

How to change dlink dir-524 router link port from 80 to 1088

How to change dlink dir-524 router link(192.168.0.1) port from 80 to 1088
2
votes
2answers
620 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 ...
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 ...
0
votes
2answers
45 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?
4
votes
3answers
9k views

How can I map a domain name to an IP address and port?

I want to give a domain name to the IP address and port for an application in Windows 7. For example, test.com should map to 127.0.0.1:59873. Is there anyway that we can do it by using a web server ...
1
vote
4answers
4k views

How can I determine if a port is open on my server? If it's closed, how can I open it?

I just set up ElasticSearch on my server, but I cannot seem to connect to it remotely (default is port 9200). I can connect to it via localhost, but I cannot connect to it remotely when I specify the ...
0
votes
0answers
27 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
20 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
22 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 ...
7
votes
4answers
43k views

Is there a simple way to detect ISP port blocking?

Is there a way to tell the difference between my ISP blocking traffic on certain ports and my NAT router/firewall blocking that traffic? The sites “Shields Up” and “Can you see me” show my ports ...
0
votes
1answer
98 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 ...
7
votes
3answers
13k 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?
1
vote
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
vote
1answer
32 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
42 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 ...
3
votes
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?
0
votes
2answers
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 ...
-3
votes
1answer
22 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
32 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 ...
1
vote
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
votes
1answer
232 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 ...
50
votes
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?
1
vote
0answers
27 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
33 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
0answers
83 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
1answer
58 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
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
votes
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
votes
1answer
891 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 ...