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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how to limit number httpd process for port 80

So lets say I have 10 instances of httpd on port 80 and another 10 on 443. I run everything through 443, so I don't see the need to balance the connections (80 is used only to redirect to 443) How ...
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1answer
23 views

Change NFSv4 Bound Port?

I need to use port 2049/tcp for another purpose. Is there a way to change which port NFSD binds to? I don't need NFSv3 or NFSv2 so I am not using rpcbind service. I cannot find that config option...
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1answer
149 views

Change the order that an IPTABLE CHAIN is read (Using Fail2Ban)

I have some experience using iptables and fail2ban. Both are working as they should, but I would like to optimize the way packets are "DROPed" when IP & port probing occur. Fail2Ban is doing a ...
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1answer
1k views

Getting 'ERR_CONNECTION_REFUSED' when trying to browse port mapped to Docker container

I have pulled a Docker image: $ docker pull ghost And run a container from the image: $ docker run --name test-ghost -p 8080:2368 -d ghost ...
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0answers
71 views

Is firewalld blocking return traffic?

I'm on Debian 7 trying to forward requests to other machines through firewalld and have the following setup: --HOSTNAME-- ----IP----- ------------Configuration------------- Firewall 192.168.0.2 ...
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8answers
42k views

How do I get rid of sockets in FIN_WAIT1 state?

I have a port that is blocked by a process I needed to kill. (a little telnet daemon that crashed). The process was killed successfully but the port is still in a 'FIN_WAIT1' state. It doesn't come ...
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4answers
291 views

azure endpoint for cassandra does not work for ports 7000, 7001, 7199

I have setup apache cassandra on a centos7 compatible linux machine in azure. I can telnet directly to port 7000, etc on the IP address on the machine, however I cannot telnet to that same port from ...
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0answers
63 views

interface not showing on port-channel (dell S5000 switch)

Our trunk went down due to a faulty cable, but when we had it replaced, the interfaces (speficially TenG 0/4 and /5) are not being shown on the port channel group even if they are physically up: Our ...
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1answer
73 views

Prevent port from being used by anything but one application

Is there a way to make only java be allowed to use a certain port? OS: Windows Web Server 2008 R2 No access to router (hosted box).
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0answers
28 views

Cant configure NAT in iptables

Есть два сервера с линукс. Первый выполняет роль роутера, он имеет два сетевых интерфейса, один из которых подключен к интернету, другой к локальной сети. Второй сервер подключен к локальной сети. ...
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1answer
101 views

iptables outgoing default policy is accept, but some ports appear blocked

I'm new to servers and iptables. I have a web app (happens to be bugzilla) running on my Centos 6.7 apache/httpd server, and it attempts to connect out to the web (updates.bugzilla.org) via port 80. ...
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1answer
69 views

only allow a specific port that can be connected by only one ip address at the same time

I have a open port, 40002, I want to limit that at the same time the port can only be connected by one ip address(not specific address). if there is an ip address conntecing to that port already, ...
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3answers
648 views

Is there a top like tool that shows processes and ports, live?

I'd like to be monitoring ports in "realtime" and the processes that use them. Is there any tool that can handle that? I imagine somethinkg like top, but with a column that lists all ports the process ...
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3answers
3k views

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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1answer
70 views

Tomcat and Apache parallel usage on different subdomains

I have just set up an Ubuntu server with Tomcat7 and Apache2. Apache is running on port 80, Tomcat on port 8080. What I want to do now is to redirect certain subdomains to Tomcat. mydomain.com ...
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2answers
231 views

Can't make nginx listen on nonstandard ports (3000, 35729)

This is on a fresh install of Ubuntu 14.04 running on a VPS. For example the following will work: server { listen 8080 default_server; root /var/www; location / { try_files $uri ...
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0answers
142 views

Nginx listening on different port but not accessible from outside

OS: Ubuntu 12.04 I have both Apache and Nginx running. Apache is listening on port 80 and that is why I want to make Nginx listen on different port, in this example it would be 90. Below is the ...
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2answers
43 views

Firewall setup - Input and Output

Sorry for my english. I am having some troubles understanding if I should open ports via input, output, or both. For instance, let's take the basic HTTP port 80. To set up a standard client. If I ...
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4answers
6k views

netbios-ssn Port 139 open on Linux machine

all. I'm desperately trying to pass a Security Metrics test, I've been trying for a few days, but I 'm always left with the same problem: NetBIOS available on Linux Service: netbios-ssn Port 139 ...
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0answers
102 views

Error when viewing database mirroring monitor in SQL Server with non-default port

I have database mirroring set up (with witness) on SQL Server 2014 Standard. Both servers use default instance on a non-default port (not 1433). Mirroring works perfectly fine. However, when I try to ...
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1answer
92 views

Docker run command, expose port private only

docker run -it -p 8080 myimage /bin/bash I would expect the code above to expose port 8080 private. However when I run: docker ps -a It shows: 0.0.0.0:32770->8080/tcp How does one set port ...
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0answers
108 views

How should I set up my sub-domain to allow it listen on a port for web socket transfer?

This may be a really beginner question, but I really want to make sure I'm going in the right direction before investing time in this. Heres what I have. charlieli.me @ 45.55.33.185:80 ...
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2answers
140 views

Do network administrators block outgoing traffic to not-well-know ports? [closed]

I've written a Java server to listen on port 49474. My client runs on Android phones all over the US. Of course, they will be connecting from a variety of networks: home, work, school, library, ...
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0answers
21k views

Cannot telnet to SQL Server on port 1433

I've been working solidly on this issue for the past three weeks. I cannot seem to find where the actual issue is. I just recently found this article on how to troubleshoot the connection. I made it ...
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3answers
1k views

What port does OpenLink ODBC Driver use?

I use Avaya Reporting Services and OpenLink ODBC Drivers for db connection. I know that it uses port 5000 for handshaking but after that I believe it uses an random port for communication. I want to ...
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1answer
1k views

Windows SMTP Service - Configure Smarthost for Specific Domains over different ports

I have a client that was recently acquired by a company. Their email system now resides on the parent company's network. Currently there is no VPN setup between my client and the parent company. I ...
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3answers
4k views

Allow iptables to allow ip range only on specifc port

In this question I see a line like this that will allow me to say "allow these ip addresses to connect" iptables -A INPUT -m iprange --src-range 10.50.10.20-80 -j ACCEPT Now, I want to further ...
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5answers
3k views

What ports are least likely to be probed on the internet? [closed]

Suppose you've got a server that runs insecure software and you have to make it publicly accessible, what ports are "safest" for providing that service on the internet. By "safest" I mean least likely ...
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3answers
6k views

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
31 views

okay to allow any outgoing port for sending mail

I have a small app on my centos6.6 server i am running that allows the user to send an email on a custom port and I am allowing any port to be used. Is there any security risk for allowing this app to ...
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0answers
75 views

Debian Openvpn port closed

Newbie in linux! there is already similar questions are asked here, but the solutions are not working for me. can somebody help me with this issue: I have been installed openvpn server on debian 8.1 ...
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2answers
91 views

How to list open but not used (by a process/program) port?

I have a VPS with debian wheezy installed on it. A firewall is active on the it with all ports not allowed by default. The firewall can be managed through the web interface of the provider of the VPS ...
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2answers
140 views

Multiple protocols on the same port [closed]

From my understanding, Facebook Messenger uses 443 for both HTTP and MQTT (or whatever protocol they may use now) traffic. That seems to be a good strategy, as in some very constrained networks only ...
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2answers
64 views

IIS can't use port 80 in w2k3

I have a w2k3 server running IIS and exchange. IIS is used for sharepoint interface. Recently, i had to install a self-certificate in the server to use IMAP over SSL with a tool named Selfssl. No ...
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0answers
37 views

amazon server using RedHat EL 7 on port 3306 so that i can access mysql database remotely

I want to remotely access mysqld on port 3306 but when hen i telnet from public ip address i get a connection time out error. Whats happening here. But within the server telnet is working just fine ...
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3answers
5k views

Cannot change PostgreSQL port

I run Postgresql 8.4 as a service on a CentOS 6.2 server. I set port = 21444 and listen_addresses = '*' in /var/lib/pgsql/data/postgresql.conf and I changed 5432 to 21444 in postmaster.opts and ...
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1answer
527 views

Run Service Control (sc.exe) command on secure port

Our team runs the following commands to turn on and off Windows Services (e.g. JBoss Native) from the Windows command line as well as through source code in a program. It connects to a remote box. ...
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4answers
3k views

What firewall rules should be used for a home based system [closed]

I'm just setting up a home wireless network with connection to the internet. The router has settings to configure the firewall rules. Currently it's set to INBOUND ALL ANY and OUTBOUND ALL ANY. ...
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0answers
69 views

IIS 7.5 - Not listening 0.0.0.0:80

I am using IIS 7.5 on Windows Server 2008 R2. From this server, I can access the localhost (standard IIS start page is displayed). But I can't access it from any other machine belonging to the same ...
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0answers
183 views

iptables open port to an LXC container with public IP

I've encountered a strange problem I have no idea how to fix. I'm trying to close all ports on my server, and open only the ports I need in the directions I need. Thus, I ended up with: IF=eth0 ...
0
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1answer
237 views

How many data channel ports do I need for an FTPS server running behind NAT?

As the title states, I currently have an FTP server accessible via FTP or FTPS (explicit) running NATed behind a router. The server is running Windows Server 2012 R2 with IIS 8.0 (I believe that is ...
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4answers
10k views

How to run node.js app on port 80? Are processes blocking my port?

I believe the port 80 on my remote instance is blocked, and I am trying to run a node.js app using port 80. I have experimented with ports 3000 and 3002, and both ports are working fine, but I get an ...
0
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1answer
60 views

Only a certain subdomain accessing a certain port [closed]

Is there a way of having only a certain subdomain access a port? Let's say I have a Minecraft server running on default port 25565. I also have domain.com which is pointed to the IP of the server, ...
0
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1answer
142 views

What might be using my smtp port on a new CentOS machine?

I'm trying to setup a simple email server using node smtp-server. I'm the only one that's ever accessed the machine (a CentOS 6.5 box on Digital Ocean), and I've only set up 2 http servers. I'm ...
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1answer
16 views

Which log file can I use for server port analytics?

Ideally I'd like to use piwik to track conversions from ads to server connections on port 5000 and port 5001 but I highly doubt that is even possible. I'm willing to settle for [ipaddress,time ...
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1answer
54 views

Load tomcat application via DNS without typing 8080

I am having a Amazon EC2 Ubuntu instance. I have installed LAMP server and tomcat 7. I also have application running in tomcat. Now, my URL for apache is - ...
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3answers
2k views

Windows Server 2008 - unable to bind any TCP port

OS: Win Server 2008 RC2 Windows firewall on (no effect when off) I have suddenly been plagued by an issue in which I cannot find any similar ones with a search. I am running about 20 game servers ...
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3answers
2k views

Port forwarding with proxy server

I'm behind a firewall with incoming connections blocked on all ports. I'd like to run an Apache Web Server on my machine. Is it possible to configure a free public proxy server to forward the incoming ...
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0answers
127 views

create tunnel in order to access https via port 443

I have win machine that connected to Linux server 192.9.100.10 And Linux server has connectivity to the IBM blade center management GUI - 192.9.100.200 From my WIN machine I not have connectivity to ...
1
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1answer
255 views

Can't access to a port (which is running Spring boot jar) via it's public ip

I have deployed my spring boot app jar to centos server with this command: nohup java -jar black-0.0.1-SNAPSHOT.jar > log_black.out & In my application.properties I set the server port ...