Port is a generic term that can refer to port number (software related term), and computer hardware port. Here, questions referencing this tag refer to port numbers.

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List of ports and applications

How do I get a list of active ports and applications using them in a Windows Server 2003 box? Any free utilities? Thanks
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3answers
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Changing IMAP port for Dovecot

I'm running Dovecot to let people access their email on my server. Unfortunately, some are on networks where they can't connect on the normal IMAP port, so I'm trying to change it. I changed the ...
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2answers
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Nginx 502 Bad Gateway - 111: Connection refused, port not being listened to

I'm aware there are many other similar questions but the solutions from those questions I feel I've already got in place. I've got 3 sites running locally on a VirtualBox Ubuntu 12.04.4 LTS Server, I'...
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1answer
833 views

Can a FTP server use control port other than 21 (default control port)?

Can a ftp server listen on any other port than 21 (default control port to which any FTP client initiates the connection to)? If yes, how does the client know on which port it has to initiate the ...
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3answers
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Port 80 and 443 won't forward?

I live in Australia, and my ISP is Bigpond (ADSL2) with a "Thomson TG782T" Router, and my port 80 and 443 won't forward. I have set up an Apache server before years ago (I was in a different location),...
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2answers
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Forwarding traffic to a specific port on to different IP

My friends have a Mine craft server with an ip to connect (206.217.128.131:25571). This is obviously not ideal as a true domain name would be more user friendly. Although I share a VPS with a friend ...
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1answer
692 views

Cloud Server Port says connection refused?

I'm playing around with using a Rackspace Cloud Server (running CentosOS 5.5) as a server for the Beanstalk Message Queue system. I'm starting Beanstalk with the command line of "Beanstalkd -d -l ip ...
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2answers
601 views

How can I block an application binding to a port (all OSs)

Following up from an issue today, I have a question, possibly stupid, but here goes. How can I block/prevent an application binding to a specific port? This pertains to linux/unix, but I'd be ...
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1answer
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Nginx setup, 443 open but no respons on https://

So i just integrated my certificate and my nginx conf verifies it when i restart. When i do a: netstat -anp | grep 443 it returns: tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN ...
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2answers
333 views

Can't SSH, but can TeamViewer [closed]

I would like to SSH into a computer behind a firewall that blocks SSH connections (incoming and outgoing). Amusingly, I can still access the computer using the remote-desktop software TeamViewer. I ...
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1answer
936 views

Port 8080 remains closed even when opened with iptable and nodejs is listening on it [duplicate]

I am trying to install a nodejs server listening to port 8080 that I opened with iptable but when I run nmap or a web tools I always get the message that the port is closed. I'm on a Ubuntu vps. ...
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1answer
162 views

How to restrict access of a process to specific ports?

How can I restrict access of a process to use only specific ports, or block it if it uses non-allowed ports?
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1answer
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Windows Server 2012, application needs administrative access to open port

How can I grant an application access to listen on one particular port, without running it as Administrator or disabling UAC? Per policy, had to transition from an old server (Windows Server 2003) to ...
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2answers
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Explain how to bind a service to a ip and port [closed]

Yesterday I had a discussion about running the same service, for example SMTP, on the same port on a server. I think this is possible by assigning multiple ip addresses to the server and bind the ...
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1answer
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OpenVPN and port 1194 closed

I installed openVPN on my server. By default, the port 1194 is choosed. The problem is that when I am running: sudo nmap -sU localhost -p 1194 It shows me: PORT STATE SERVICE 1194/udp ...
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2answers
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How does server handle multiple clients on the same port? Multiple sockets or multiple ports? [closed]

I have a misundertanding about some networking theory and because I couldn't find a definitive answer online (most resourceas are theory and theory etc without concise examples) I'm asking here. ...
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2answers
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Apache / Tomcat port information

I have few questions regarding the Apache HTTPD server and the Tomcat web server port configurations. Through netstat and TOMCAT/conf/server.xml I understand that: 80 and 443 ports are used by ...
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2answers
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How can I make Jenkins inaccessible to the outside world?

On a development server, I have installed the tool Jenkins for automated testing. This runs on port 8080. If I go to www.mysite.com:8080 I can see the command panel for this. I want to make this ...
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2answers
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Which TCP ports to use?

Is there a TCP port range which I can be sure will not be used by anything else for traffic between two machines? If I am reading RFC6335 correctly, I can be sure that no other applications will use ...
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1answer
101 views

Forward Requests to Subdomain to another Server [duplicate]

Possible Duplicate: FTP reverse proxying based on hostname/domain I have 3 servers which all have FTP on the same port. They are all at the same ip address behind the same router. The router ...
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2answers
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iptables: Allow port range but deny to certain IP

I am running a server which needs UDP ports 1000:11000 opened, as well as TCP 10011 and 30033 open to function. I have a set of iptables rules set to allow SSH and those ports, and intentionally left ...
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3answers
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Examining Multiple Ports When Running NetCat (nc)

I am looking to test if specific ports are on a host are open. I am using: nc -z host 22 nc -z host 80 nc -z host 443 nc -z host 8080 which works, but it would be nice to use a one-liner like: nc -...
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2answers
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How to redirect ports for on a virtual interface?

There are two IPs associated with one physical network interface eth0 and eth0:0. The following works fine for the first interface: iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j ...
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2answers
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IPTables - Change Port of outgoing and incoming packets

Is it possible to configure IPTables in a way that all outgoing packets to a certain IP and Port are altered with a different port and do the same for incoming packets? I have to work with a server ...
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1answer
449 views

Recommended ufw port configuration to secure tomcat web-application ubuntu server?

Assuming an ubuntu server operating web applications on Tomcat (with redirection from apache 80 to 8080). What is the recommended port configuration to secure the server? Thanks. P.S.: I would like ...
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2answers
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MDaemon cannot start IMAP server, seem that “something else” is blocking it

We were using our MDaemon email server on Windows Server 2003 for years without any issue. Since a few days, the IMAP server suddently stop and gave us one error message: Winsock Error 10013 ...
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3answers
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Port rerouting alternative to IPTables?

I am trying to reroute ports on a specific IP. Is there any way around this without using iptables? BACKGROUND I am using node.js & socket.io as a real time server. To ensure this server is ...
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1answer
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How to fix customer display pole that displays garbage?

I have an Openbravo POS workstation with a customer display pole. The pole is VFD-860. When I click on the products on the Sales page of Openbravo, the display responds but displays garbage: When I ...
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1answer
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Bind Xvfb on localhost rather than *

I am using Xvfb to run an a wine background application that needs a valid display. It appears that it binds to *:x11. For security reasons I would like to avoid opening any unnecessary ports. Is ...
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2answers
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How can I check if a particular port is open from one site to another?

I want to know if port 139 TCP is open from a server on one domain to another. How would I do this? I know that I can use Telnet to test port 25 to a server with Exchange installed - but that only ...
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2answers
7k views

How to test firewall connectivity?

Somehow I have been charged with the task of organizing the installation of a new production environment involving 4 servers. I have to make requests to the Network administrator to open up ports on ...
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2answers
480 views

Redirecting to port 8080 if accessed by a certain domain

I am running Apache on port 80 of my server, and JBoss on port 8080 of the same machine. How can I have Apache redirect requests with a certain domain name to the JBoss server on 8080? I'd like to ...
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3answers
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DELL switch 6248 port and mac mapping using SNMP

I have a Dell 6248 switch. I connect some of my servers to it and want to know which server nic connected to which switch port. I try using snmpwalk to get this information, but I just can get mac/ip ...
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3answers
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How do I configure Windows Firewall for FTP Server

What ports do I need to open for me to be able to access Windows FTP server (running on Server 2008) for both active and passive FTP? Opening 21 on it's own is not enough.
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2answers
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Windows Server 2012 R2 port 443 open, stopping IIS doesn't work

Sorry for the bad wording in the title, 'doesn't help' is not allowed as a title, I am definitely able to stop IIS. While trying to install VisualSVN I ran into the problem that port 443 was already ...
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1answer
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openSUSE installs and VMs constantly being hacked and bricked

Sorry if this is a total newbie question, but I'm doing frontend design work for a radical political organisation and ALL my installations of Linux, be they openSUSE, Ubuntu or Fedora keep getting ...
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2answers
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Block specfic port for the access of the application from outside with impacting the access to local host scripts [duplicate]

I have setup one application 'phanthomjs' that is running of specific port 6423 I wish that it should be accessible to script that are run locally on the box 'localhost', not accessible from outside. ...
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1answer
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Port 80: connection refused. How to fix on Mac OSX? [duplicate]

I've noticed some issues with Apache virtual hosts on two Macs that otherwise have the same kind of set up (in terms of httpd.conf, vhosts, hosts etc.) On one Mac, virtual hosts are served without a ...
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2answers
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How can I get a list of the ports that Wireshark knows?

When I need to choose a new port to use (internal to an organisation) I used to look in /etc/services. This is no longer sufficient, as Wireshark knows about many other ports that are not in /etc/...
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2answers
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VMware ESX: Unable to delete PortGroup. 1 active ports

At work we have an ESX 4.1 cluster with some vlan's (Port Groups) configured on a vswitch on each host. A lot of these port groups aren't in use anymore so we decided to clean them up. We don't have ...
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2answers
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Route webserver on 8080 through another webserver on port 80

I have a local webserver that is mapped to port 80 (Windows, XAMPP http://www.apachefriends.org/en/xampp.html) and a domain "mydomain.com" that directs to the local webserver's IP. Everything works ...
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1answer
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Sendmail & IpTable Rules

I need to setup IpTable Rules for a server with nginx, ssh and sendmail. Now, the problem is, with my rules I can not send emails to other hosts anymore. Emails to localhost do work, but sending to ...
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1answer
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proxypass apache over nonstandard port - how can it be that the 192.168.*:9999 works from the computer itself but not another computer on the network?

httpd.conf vhost looks like this: <VirtualHost *:9999> ServerAdmin admin@example.com ServerName www.example.com ServerAlias example.com # Indexes + Directory Root. ...
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1answer
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Putty alternative for windows with support to remote port forwarding

I have been trying to find an alternative to putty for windows. It needs to be portable and it must support remote port forwarding. Putty has had problems with its own implementation of remote port ...
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2answers
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Why am I unable to telnet to a local port that has a listening service?

I suspect this is either a very simple question, or a very complex one. I have a headless server running ubuntu 10.04 that I can ssh into. I have full root access to the system. I am trying to set up ...
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4answers
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Cent OS firewall opening port

I've installed postgre on a CentOS server. I basically followed this guide here: PostgreSQL On the last step it says I need Open TCP port 5432 and to do so I need to add the following line to my /...
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2answers
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General firewall / security procedures for webservers & databases

My webserver and database server are separate. All I've done to secure the webserver is used ufw and denied from all except ports 22, 80, and 443. What else really needs to be done there? On my ...
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3answers
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Check port status on CentOS

I have a CentOS machine, and I opened a port on witch I should get a stream (actually it is the 5004 port - rtp). However, seems like the stream is not received. Is there anyway to check on status of ...
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1answer
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what port do use for vpn?

At the moment I'm running an OpenVPN server on a non standard port. Unfortunately this make some roadwarriors unable to connect because of traffic limitations depending on where they are. Sometimes ...
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1answer
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Which ports does WMI Service in Active Directory use exactly?

I read in the technet, that the WMI Services uses random ports over 1024 because of RPC.. Now is the question does it use 1025-5000 because of the microsoft port reservation or could it use more than ...