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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ASUS RT-N66R won't allow port forwarding of 80

Has anyone else tried to port forward outside port 80 to inside port 80 on an ASUS RT-N66R? I just spent 3 hours trying to get a new web server functioning from the internet (which I've done quite a ...
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1answer
28 views

How to create a subdomain pointing to a different port number?

In my use case I would like to create a sub domain with the main domain's IP address but with different port number. For example: I have the the main domain as abc.com pointing to 192.168.1.1 @ ...
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1answer
15 views

VPN and local Apache port forwarding

I have the following configuration, Apache Web host that is running on my local PC at port 4444. I've registered at noip.com for DDNS, and I've done setup correctly. Was wondering, since I am ...
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0answers
5 views

Windows Server: Ports that a normal user cannot bind to

I have a server application that wants to bind to port 1841 on my Windows Server 2012 and, when run as a normal user, seems to fail at that point. I remember that some port ranges could not be bound ...
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1answer
23 views

receive data from buffer in socket programming

please see this picture. recvfrom() blocks until a datagram is received from a client. Since there is no connection,each datagram may come from a different sender. i can receive data form receiver ...
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1answer
29 views

MySQL Port 3306 on VPS not visible from remote

Newbie here, migrating my site from a shared host to a name-based virtual host on a new virtual private server (Linode) running Ubuntu 16.04. Apache is working. I have installed MySQL and created an ...
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4answers
649 views

Understanding unique ip and port [duplicate]

My browser is Firefox, with 3 open tabs: tab1-->google.com tab2-->yahoo.com tab3-->msn.com All of them use port 80, and so does Photoshop: How does computer know which data belong to ...
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0answers
16 views

Serial port info in Ubuntu

my first post. This is the actual code: int Open( //Serial port name. const char* pPortName, //Is IEC or DLMS used as starting protocol. bool IEC, //Maximum ...
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2answers
31 views

Using nmap to traceroute on a specific port

The short version of this is that from client A to server B, some connections are getting all the way there, and others are being dropped in transit. I know they're being dropped in transit because, ...
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1answer
35 views

Intermittent Port Open/Close

I'm experiencing intermittent port opening issues. I have a server which uses TCP running on port 8080 in CentOS 6. iptables is disabled and port 8080 shows it is LISTENING for traffic. Here is a ...
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1answer
15 views

Port 5588 Connection Refused

Before I make this, please note that I have searched and found no answer to why this is happening. So do not mark this as a duplicate as that's invalid. For some reason when I go to http://...
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1answer
25 views

How to use ethereal to determine what port to open?

Let's say I closed all the ports with iptables and I start a new app like a browser, mumble or any program. Is there a way for me to see with ethereal what ports this application is trying to ...
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29 views

Why doesn't nmap show SIP ports open for this router?

SIP calls on from demo_bob to demo_alice on Asterisk had no sound, so I opened ports on the NetGear WNR1000v2 - N150 Wireless Router: # Service Type Port IP 1 IP_Phone 6670-6670 192....
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16 views

AWS Bitnami Tomcat Stack: Connection refused on :8080

I installed KIE Server and Drools Workbench following this tutorial on an AWS EC2 instance based on a ready to use Apache Tomcat stack by Bitnami. The installation went well and so I'm able to start ...
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2answers
56 views

Iptables - Remove filtered ports and close them

Here's the result of nmap command on my dedicated server from my home linux pc : Not shown: 980 closed ports PORT STATE SERVICE 20/tcp filtered ftp-data 21/tcp filtered ftp 22/tcp ...
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3answers
56 views

why is my processes in task manager showing ports like 100028,103904 etc ? I know only 65535 are possible in any windows system

I am on W10 x64. This is unusual . I haven't seen port number that high .I know only 65535 are possible in any windows system. it is happening from today ( I have rebooted several times). Is it ...
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1answer
26 views

What are the basic commands for ufw firewall in Ubuntu?

I want to setup ufw firewall in ubuntu. Please list some basic commands that I need to learn to operate it via termianl.
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1answer
19 views

How to test outoing traffic on random ports? (I'm on OS X)

In some situations or on some locations, I'm struggling with restricted outgoing traffic. For example a restricted LAN where outgoing traffic is only allowed on limited ports. I know how to check or ...
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1answer
29 views

Find the com port of a specific device on command prompt

I know we can find it out from the device Manager under ports. But I want to be able to get this info on command line so I can incorporate it in my python script. I looked at tools like WMI, Devcon. ...
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1answer
25 views

Why does SoftEther VPN listen to random ports? How do I make it stop?

I have SoftEther VPN running on a Linux server with SSTP, L2TP over IPSec, VPN over DNS, and VPN over ICMP enabled, along with management via TCP port 5555. I have disabled everything else I could ...
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1answer
64 views

What is the default range of Ephemeral Ports in Windows 7?

I used the following command to get the Ephemeral Ports range in Windows 7: netsh int ipv4 show dynamicport tcp And the result was the following: Protocol tcp Dynamic Port Range -------------------...
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1answer
60 views

What happens if all of the Ephemeral Ports are used in Windows?

If all of the Ephemeral Ports are used, and another socket tried to connect to a server, will the connection fail? or will the socket be assigned a port outside the range of the Ephemeral Ports?
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45 views

IIS 8 / Windows Server 2012 R2 - PID 4 using Port 443

So I had an issue a little while ago with port 80 being used by PID 4. But I solved this issue here. But now I'm trying to setup a binding to localhost 443 in IIS and again it can't do it. Ran the ...
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0answers
18 views

QNAP Nas File Server outside LAN

I am trying to map my NAS as a network drive outside my LAN however I have very limited knowledge around this. I have a QNap TS-212P which is configured to port forward so I can access it's GUI ...
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2answers
65 views

Why DisplayPort, HDMI port etc. while USB can do the job? [closed]

I've been using HP EliteDisplay E232 connected to my hp notebook HP ZBook 15 G2 through DisplayPort for some time now. Both the monitor and the notebook has Full HD 1920X1080 resolution. I was so glad ...
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41 views

port forwarding - Transmission torrent client

I have a problem related to Transmission torrent client. Specifically on a Fedora 23 Linux distribution. My goal is to increase download speed and surfing on the internet. I found out the best way to ...
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1answer
545 views

Block port 111 on centos 7

I am using a server with centos 7 running kvm/virtualization, I access using VNC server. Today I received an warning about my server being used to attack other server using port 111, I am completely ...
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0answers
27 views

Port translation and websphere application

I have a java application running in Websphere Application Server (WAS) on port 80 (using IBM HttP server, IHS). Now I need port 80 for other purposes on my external ip. I just setup port translation ...
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1answer
23 views

How can i access remote ports other than 80 from my home network?

I am trying to access a remote website running on port 8000. From my home network i cannot (it simply times out), but i can access it from my phone's 3G network. My ISP is Bezeq International and the ...
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1answer
51 views

I cannot connect to a port that is already open in my firewall

I have tried to open port 80 [root@rhel7 docker]# firewall-cmd --zone=public --add-port=80/tcp --permanent success [root@rhel7 docker]# firewall-cmd --reload success [root@rhel7 docker]# iptables-...
0
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1answer
15 views

HP DesignJet hardening / close ports

I am trying to close unnecesary ports at our HP designjet plotter and I still have ports 280, 8086 and 8085 open. I have switched off everyting except raw print 9100 and these three ones are still ...
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2answers
61 views

how to see which process is using which port in windows 8

I am trying to start the Tomcat server at my pc by eclipse. But it is showing the following message Several ports (8005, 8080, 8009) required by Tomcat v8.0 Server at localhost are already in use. ...
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1answer
31 views

What are the default nmap options?

Which options are used by default, when the user fires # nmap target without any explicit option? I am going to write the defaults of the three options I consider the most important. It would be ...
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1answer
29 views

port visible but not accessable

I have port 80 open through my router, I have disabled my firewall, and canyouseeme.org sees port 80. yet I can not navigate to my IP address which is my web server. How can my port be visible yet I ...
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1answer
27 views

PID 4 Using Port 80 - IIS Unable To Bind

So I've been having a problem where I can't use localhost:80 on IIS So I ran this: > netstat -ano | find "0:80" And got: TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 ...
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1answer
29 views

Does port triggering from port 80 to port 80 make sense?

In troubleshooting a VoIP quality issue, tech support had me set up numerous port triggering ranges. One of the ranges was: Triggered Range: 80 to 80 Forwarded Range: 80 to 80 Based on my probably-...
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2answers
61 views

IPTables - Redirect traffic based on country

Is there any way how to allow TCP traffic only from specified countries on a specified port and the rest of traffic redirect to another IP/port using iptables ?
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0answers
15 views

Commonly open ports in restricted wifi networks

Which ports except for 80 and 443 are commonly not blocked in open wifi networks? I want to set up a OpenVPN Server on such a port to get around restricted networks. I have experienced the issue that ...
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1answer
35 views

Port not open but still able to download : how does it work?

When using p2p softwares such as a torrent client or emule I am unable to open ports even if I allow them in my firewall and forward them in the NAT configuration. Even after doing those two things ...
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0answers
22 views

given an on-borad port PCI address, how do I know to which NIC it belongs?

Assume we have a server with 2 on-board NICs (no other NIC was inserted to any of the free expansion slots). Given a PCI address of any of the ports of the on-board NICs above, is there a way to know ...
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0answers
67 views

What kind of ports are on this PCB? (Kangaroo Pocket PC)

| Overview Please refer to the teardown of the Kangaroo mini PC (below.) I am interested in finding out as much as I can about this board and the ports associated with it. Any details/specifications ...
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4answers
55 views

Multiple tabs of a browser

Since unique port numbers are assigned to each of the different processes related to network which are going on a system.So,my question is that,if multiple tabs are open in a browser then will ...
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1answer
117 views

Connection Refused on Host OSX 127.0.0.1:3000 for Vagrant/VirtualBox/nginx Rails App

The Rails application is running on port 3000: $ bundle exec rails server -b 0.0.0.0 => Booting Unicorn => Rails 3.2.21 application starting in development on http://0.0.0.0:3000 => Call ...
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0answers
22 views

How to monitor a port bandwidth?

How can I monitor a specific port's bandwidth? I'm using squid cache server, and I want to find out how much bandwidth is preserved. using soft wares like DU METER it's not possible to measure that. ...
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1answer
44 views

Can ONLY connect to ports http:80 and https:443?

I have a problem where I can only connect to the standard http port 80 and https port 443. I can access websites perfectly and play videos and all, but when I try to connect to IP's using other ports, ...
0
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1answer
51 views

What is this port on my 1999 laptop? [duplicate]

My Maxdata Artist Harvard SL Pro laptop, dating from 1999, has this port on its back side. I have never seen this anywhere else, neither can I identify the little icon to its side. The size of the ...
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69 views

Connecting a 2-pair Ethernet Cable to my Home Network

I have a IP video doorbell that connects using a 2-pair telephone line. I have managed to connect it to my DSL router (Linksys WAG320N) successfully and connection is working fine with live streaming ...
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1answer
27 views

Using firewall-cmd to open up a port for INPUT only

I'm using firewall-cmd on centos7 to open up a port. But, I want to open up the port for INPUT only. I currently have this, but it, presumbably, opens it for INPUT and OUTPUT. sudo firewall-cmd --...
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3answers
76 views

My web server and web browser appear to be using port 80 at the same time

If I, on OS X, Start Firefox. Start Google Chrome. Start a Ruby on Rails server on port 80 (using RVM) rvmsudo rails -p 80 Use lsof to look at what is running on port 80 sudo lsof -i:80 Then I ...
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2answers
30 views

Things That Affect NIC Cards' Performance?

Folks, I have a laptop and a tower. And I use EtherCAT (through Ethernet port) on both. But I notice that if I unplug my cables on the tower, I loose a lot of frames, where as in the laptop I may not ...