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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UDP/TCP ports on AWS ec2 public IP blocked

My goal is to receive/send UDP packet traffic on specific ports on my EC2 instance (on my eth0 private IP) via my public IP. I am asking because I have set my security group to allow all ...
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2answers
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Check on Linux certain port is occupied

I'm writing a script that will spin up server that want to use certain port number. In some occasions this port is occupied. I want to know how to check it in bash so I can react in proper way. How ...
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0answers
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Haproxy Nginx : How not to forward the local port?

I have haproxy which listening on ports 80 and 443 and behind Nginx listening locally on ports 8000, 8001, 8002 etc... By default, all works fine but when an application web made a redirect 301, it ...
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0answers
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Ports aren't really getting blocked with iptables

I'm on Ubuntu 14.04.4 LTS, I'm under attack from some ports, I blocked all of ports except SSH in my own server, I'm doing that by this way: iptables -F iptables -P INPUT DROP iptables -P OUTPUT DROP ...
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1answer
24 views

Port Scanning Large Sets of Targets

1)How would you check to see if a list of ~10000 IPs if they have port 80 open? 2)How would you go about the same scenario but with a port range? 3)How would you check a list of 10000 IPs to see ...
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1answer
5 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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0answers
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ethtool doesn't show speed

I'm trying to display my servers link speed / port speed and it's not allowing me to see anything.. ethtool eth0 is only displaying the output root@computeapi:~# ethtool eth0 Settings for eth0: ...
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1answer
32 views

How to redirect my request from port A to port B? [closed]

I got a server running on port A, but my network infra only allow port B can be opened to communicate with outside world. Is this possible to receive request via port B, and transfer the request to ...
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3answers
965 views

rsync: ssh unknown option -p2122

I run this command to replicate data from one server to another. It's been working for a quite a while. I have this setup as a cron job. Yesterday for some reason, it stopped working. I ran it ...
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0answers
149 views

IPA Server installation: Error with port number

When I am trying to install IPA server, I am getting the following error : IPA requires port 8443 for PKI but it is currently in use. Aborting installation I checked with netstat -tuplen | grep ...
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8answers
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Port 80 is being used by SYSTEM (PID 4), what is that?

I am trying to use port 80 for my application server, but when I perform "netstat -aon" I get TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 When I look up the process in ...
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1answer
32 views

Unable to SSH to AWS on home network?

I am not exactly sure if this is the right place. I have an AWS EC2 instance which I am trying to access using putty on windows 7. I have been doing it using my phone hotspot successfully. But it ...
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1answer
57 views

How can I open ports in my dedicated linux server? [closed]

I tried using csf using this tutorial. But I am getting some error as below related to iptables. root@s104-238-95-3 [/etc/csf]# perl /etc/csf/csftest.pl Testing ip_tables/iptable_filter...OK Testing ...
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0answers
18 views

Commonly open ports in restricted wifi networks [closed]

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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0answers
26 views

Which ports should I allow in my firewall configuration? [closed]

I'm configuring firewalld on a Linux server and I'm unsure of what ports are safe to leave open. I'm currently allowing the ports listed below. Are any others necessary for standard web server ...
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1answer
32 views

Unable to find a process id [on hold]

I have an app in Erlang which I fail to launch: "Protocol: ~tp: the name my_app@my_comp seems to be in use by another Erlang node",["inet_tcp"]} I've tried to figure out the PID of the Erlang to ...
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2answers
56 views

Run multiple websites/services on different subdomains with only one IP

I'm sure I can't be the first one to ask this, but I was not able to find anything that would fully apply to my scenario. So my apologies in advance, in case this has been asked before. I have a ...
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0answers
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How to configure a USB virtual port interface on Windows-7

I have an embedded board with a USB output, which is plugged into Windows-7 desktop. I installed ST Microelectronics' STM32 Virtual COM Port Driver. It reported that it installed okay. How do I ...
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1answer
55 views

Who's blocked access to my SMTP port?

I have a very small scale personal mail server than I run on a VPS. Yesterday I migrated this, and changed the DNS records with the registrar (godaddy). Because of some limitations on the new host ...
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4answers
24k views

Monitor ssh on non-default port with Nagios

I just deployed Nagios on a Gentoo server and everything is fine except ssh, which it marks as "CRITICAL" because it's refusing connections. But that's because it's running on a port different from ...
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1answer
31 views

Monthly port monitoring

I just created a shadowsocks proxy in Tokyo (AWS) with multiple users on it. Each user has one specific port to connect and log on it. My question is, is it possible to monitor for each port ...
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0answers
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Connection Refused on Host OSX 127.0.0.1:3000 for Vagrant/VirtualBox/nginx Rails App [migrated]

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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1answer
22 views

Using AWS, EC2, can't reach port 1433 for sql server

we're using two AWS EC2 instances, win 2012 servers, one for MS SQL Server and one for IIS. IIS is unable to reach port 1433 on the SQL Server. Here's what we've tried: Checked VPC setting and no ...
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1answer
3k views

Open port 8009/tcp on Fortigate necessary?

A nmap scan of a Fortigate Firewall showed that TCP port 8009 open is. According to knowledge base articles this is only to download the client for ssl vpn. Is this port used for anything else, and if ...
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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
1k views

Cannot connect to a port from outside even if Windows Firewall is OFF

I'm getting a strange problem in my Windows 2008 R2 server running on a Hyper-V Virtual Machine. My application is listening to port 8002, which is well listed in command: netstat -na Now I'm able to ...
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2answers
1k views

Stop IIS 8.5 from listing on Port 80, but still listen on port 443 for specific IPs

A have an application server that serves a number of IIS 8.5 applications on a number of IP's. Some use port 80 only, some use port 443 only, some use 80 & 443. For the sites that use 443 only, ...
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1answer
131 views

Iptables are blocking WildFly10 on CentOS 7

I've CentOS 7 server without firewalld but with iptables installed. There's WildFly 10 is running with changed socket binding http port 8080 to 80 in standalone.xml. I'd open 80 port in iptables ...
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1answer
3k views

Mirroring all traffic from one port to another for monitoring in Linux

We recently found a bug in a hardware vendor's ability to port aggregate to a monitoring port. They have given us an estimate og at least 6 months of development to get a fix. As this is an ...
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1answer
1k views

OpenVPN client opens a random UDP port?

We are noticing this on a number of our openvpn clients: [root@box ~]# netstat -tulpn | grep openvpn udp 0 0 0.0.0.0:53950 0.0.0.0:* ...
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2answers
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Bind DNS server respond timeout

I've set up a BIND DNS server on centos 7. I've created the master zone record, it is the following: $ttl 38400 loool.ro. IN SOA ns1.loool.ro. owner.yahoo.com. ( 1421842090 ...
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2answers
612 views

serial port forwarding/virtualisation?

I have a python script(UBUNTU) reading and writing info from local serial port. It works fine! What if instead of using the local serial port, I want to use another machine serial port, remotely? ...
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2answers
37 views

Make user or group own port

In some situations a web application will talk to clients through a reverse proxy (e.g. Apache with mod_proxy) where the reverse proxy is listening on port 80 and the web application is listening on a ...
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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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1answer
64 views

Howto expose port in docker container

I’ve run a web service in a docker container on a custom port (8080). Here, I’m trying to run a container, exposing the relevant container’s port (as seen here), but the no avail. docker run -p ...
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5answers
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nmap on my webserver shows TCP ports 554 and 7070 open

I have a webserver that hosts various websites for me. The two services that are accessible outside are SSH and Apache2. These are running on a non-standard and standard port, respectively. All other ...
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0answers
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Apache vhosts redirect to www.domain.com:PortNumber/

I'm having the following problem with Apache 2.4. I have set httpd.conf file to listen to 2 more ports (8081 and 8082) like this: Listen 80 Listen 8081 Listen 8082 DocumentRoot "C:/xampp/htdocs1" ...
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1answer
71 views

How can a system hold more then 65535 concurrent TCP connections?

As far as I know, a TCP/IP stack can only maintain an absolute maximum of 65535 concurrent connections; while reading the white-paper for some F5 BigIP load balancers, I see that these can hold open ...
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2answers
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Port decisions for email setup in 2016 (Ubuntu)

I have a new Ubuntu 14.04 LAMP server with the UFW firewall setup on DigitalOcean. My goal is to add email for use on my phone(iPhone) and laptop(via Roundcube). There is a lot of old information ...
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1answer
22 views

Can't connect to socket from outside

I have a problem on my server when I start an application that listen to a port: I can connect to it from the same machine, but not from the ouside world. I noticed this problem when trying to create ...
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1answer
25 views

FTP Port Protocol Type

I recently switched to a different VPN provider, therefore did a fresh server installation. Before I proceed, please keep in mind that I am not super experienced with server stuff. I am having a ...
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2answers
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Cannot copy a local file to live server over a port other than 22 [closed]

I am trying to copy a file from my computer to my server through scp command. I have changed the default sshd port from 22 to 36871. Now, the problem is when I issue the scp command over port 36871, I ...
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1answer
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How to set up port forwarding on a NETGEAR ProSafe™ Gigabit 8 Port VPN Firewall FVS318N?

UPDATE: Rule might be right, but app still isn't functional. See more details after the screenshots. I want to forward port 3000 to a machine in the local network (192.168.1.106). So far I've ...
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1answer
93 views

Reject all except for whitelist policy with firewalld

I've been reading on firewalld for about the whole morning, and I came up with the following public zone: <?xml version="1.0" encoding="utf-8"?> <zone> <short>Public</short> ...
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3answers
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How to check if a port is blocked on a Windows machine?

On the Windows platform, what native options to I have to check if a port (3306, for example) on my local machine (as in localhost), is being blocked?
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0answers
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Redirection of ports does not work

I have a VPS, and by some reasons common ports (1 - 1000) are closed. I installed iRedMail, but did not find any ways to change smtp submission ports, so I decided to just forward connection. I have ...
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2answers
45 views

Nginx redirect port to url

I'm running a VPS that has VestaCP installed. The web panel runs on port 8083. I've managed to get it working on panel.domain.com however, some of the URL's in the panel lose functionality when using ...
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6answers
260k views

Check if port is open or closed on a Linux server?

How can I check if a port is listening on a Linux server?
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1answer
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On Azure Windows VM, Why do some ports open fine and others do not?

I am trying to set up FileMaker Server on a new Azure Windows 2012 VM (not classic). The step that has me flummoxed is opening the ports. I have created the inbound end points for the three required ...
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1answer
56 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 ...