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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nginx - connect() failed upstream under load testing

I've been doing some load testing with wrk of my nginx reverse proxy -> my web app setup and I noticed that when I get to 1000+ concurrent connections, nginx starts returning 502s and the following ...
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1answer
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Openning an RTSP port in linux

I want to check if a client can access a server via rtsp://192.168.1.5:554. As you can see the rtsp protocol and port #554 must be open and working on the server. Can I add iptables -A INPUT -m ...
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3answers
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Which ports are required in order to authenticate against a ldap server in another domain which is behind a firewall?

I have a Linux domain running with sssd, let's call this domain NJ. I'd like machines on the NJ domain to be able to authenticate against an Active Directory ldap server which resides on a different ...
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SCOM 2012 R2 Gigabit - Level switch ports show no data

Ports on my HP V1810-45G Switch show no data, it should show atleast sent/recieved bits (should show CPU usage aswell, but atleast ports...). It's a CERTIFIED Device, all ports seem to be monitored: ...
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1answer
25 views

serving html remotely from mac os x [closed]

TL;DR: simple HTTP server is accessible locally, but how can I make it available remotely in order to view the served files from another computer on the network? I'm using a zero-configuration ...
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2answers
44 views

Redirecting RDP (port 3389) with iptables

I have a Debian server with an IP 10.10.10.5 and a Windows computer with an IP 10.10.10.7. My plan is to make the Debian server forward all RDP traffic to the Windows computer with these iptables ...
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0answers
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Cisco multi switch / multi VLAN monitoring

I have a DMZ and a internal LAN with VLANs that I wish to port monitor by means of a NIDS and three switches, if this is possible. Switch 1 (DMZ) 2950 / VLAN 10 & trunk port to Switch 3 Switch 2 ...
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2answers
23 views

How to see the java process that is using a port

I have a small Java ServerSocket application that is running on port 4444. I wanted to see the process using that port in my OSX terminal, and my first thought was to do the following: netstat -a | ...
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1answer
46 views

Is there a way to port forward a port to alternate between 2 ips [closed]

I have a server on a laptop that I move a round. if I am at my station I have Ethernet IP-address e.g. 192.0.0.1, and when I'm not I have the wifi IP of 192.0.0.99 is there way to make my router to ...
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2answers
67 views

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
62 views

Unable to connect via apache port

I created a new VirtualHost file with the folllowing parameters: <VirtualHost *:6060> ServerAdmin xxx@xxx.systems DocumentRoot /var/www/xxx/httpdocs <Directory ...
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25 views

Opening port 8000 for WCF on Azure

I created a virtual instance on Azure and deployed a couple of WCF services for testing, and also installed IIS. Then I added TCP endpoints for ports 80, 8000, and 8001. The services run on ports ...
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1answer
33 views

Enabling LDAPS: Cannot get to open port 636

I have a domain controller, which has Active Directory (AD). I want to turn on LDAPS on this AD, so that I could access the AD via secure connection. I have followed the following guide: ...
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0answers
26 views

Hadoop namenode port getting blocked

I have installed 7 VM instances of Ubuntu 14.04 LTS servers. First instance runs the namenode service and all other 6 nodes run datanode service.I think my NameNode is getting crashed or blocked due ...
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1answer
31 views

Passive FTP high port range - could the port actually be different?

When using Passive FTP, is it possible that the port number specified by the server could be altered in any way? For instance, if I see in the logs on my server the following, is it possible that the ...
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1answer
52 views

How to block every port except specific ones to a user with iptables? [closed]

I'd like to block every port except 80, 443, 1005 to a specific user (owner) with iptables. What command should I use?
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1answer
33 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
46 views

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
44 views

Can I configure a server to use a user port(>1023) for NTP?

Can a linux server be configured to use a high source port(above 1023) for NTP synchronization with a Stratum 1/2 server? Are there any disadvantages to doing this?
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1answer
64 views

ACL Rule to Open UDP Ports

I have the current rules in an attempt to open port 5060 and 10000-20000 for my VoIP provider. We are on a Cisco 1921 router. This ACL is applied to the WAN port on the router facing the ISP. Nmap ...
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1answer
35 views

cobbler managed dnsmasq is not listening on the correct interfaces

I have a cobbler server I am trying to get installed. Unfortunately dnsmasq is not listening on the correct interfaces. It should be listening on my 192.168.10.2 network which is assigned to br1 ...
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0answers
11 views

What part of the reboot cycle in Linux is WinSCP detecting as FTP port 21 being available?

When I rebooted one of my boxes running Ubuntu Server LTS 14.04.1 today, I received a strange message from WinSCP during the automated reconnect attempt that I've never seen before: ...
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Ubuntu 14.04 LTS, RDIFF-BACKUP, data source and destination on remote machines

i've got a problem with rdiff-backup... I have three systems: System-A: Data source, SSH on port 1234 System-B: Backupspace, SSH on port 22 System-C: Executive system which runs rdiff-backup. my ...
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2answers
52 views

Redirecting to game ports based on subdomain? [closed]

I've been browsing, looking for an answer and there does not seem to be one that works. Here's the situation: I have a web server (running Apache) that I only have access to the files for. It hosts ...
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1answer
33 views

LDAP communication between two local server

I want to make my LDAP Port accessible inside my private network. Is it possible? Operating System : Ubuntu 14.04 x64 My LDPA Server configuration: eth1 Link encap:Ethernet HWaddr ...
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48 views

How to prohibit connections on port 25 except from real mail servers - exim, ubuntu

I'm fairly new to email servers, and my VPS has being blacklisted (for the second time) IP Address 45.56.85.76 is listed in the CBL. It appears to be infected with a spam sending trojan, proxy ...
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1answer
24 views

http requests working on KVM virtual machine, mysql not?

I have an Ubuntu server with KVM virtual machines. I allowed SSH in the firewall so I could access the host. Also I allowed incoming traffic that has state related, established. This is the full ...
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48 views

SharePoint link to Cognos TM1 Server causes 403

We have a strange issue where a direct link from SharePoint to a Cognos TM1 URL causes a 403, however if we refresh or paste-in the link directly it works. The cause might be related to the leading ...
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1answer
619 views

Failed to connect to 127.0.0.1 port 80

I have running nginx server (doesn't matter which server): $ sudo netstat -tulpn | grep 80 tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 4268/nginx tcp6 0 0 :::80 ...
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9 views

Ganglia server in Google Cloud

Fairly new to the google platform. I needed to open up port 8649 for a ganglia server environment. When I modified the default network and added the port it shows that tcp:8649 is opened. I'm able to ...
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1answer
33 views

Iptables: some ports are closed despite being open by my iptables; can it be something else?

Beginner question. I set up the following iptables rules: #!/bin/sh # Réinitialise les règles sudo iptables -t filter -F sudo iptables -t filter -X # Bloque tout le trafic sudo iptables -t ...
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PCI says port 36141:TCP is blocked. But 36141:TCP open on iptables

PCI compliant scan fails due to port 36141:TCP is being blocked on website. I verified I cannot connection via 36141 on same server to itself: # nc -zv 127.0.0.1 36141 nc: connect to 127.0.0.1 port ...
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Port not opening even after adding security group rules on Amazon EC2 instance

I have an Amazon EC2 Linux instance. I recently installed SmartFoxServer in my instance. For that I needed to open 9933 port. So I just created inbound rules on Amazon EC2 Manager console website. My ...
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1answer
95 views

Port suddenly closed. How to re-open?

I've written a software module in PHP that manages the saving of data in different data stores (MySQL, ElasticSearch and Redis). To test the module, I've created several test plans in Apache JMeter, ...
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2answers
64 views

Port not accessible on Linux server

I started local server using php on my server php -S 0.0.0.0 8283 -t testServer/ using curl localhost:8283 I am able to get the result of the index.php file but when I access it using my server ...
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1answer
238 views

Sendmail is not listening to any port

I am using VPS hosting with CentOS 6. I've installed Sendmail, but it's not listening to any port. I've checked, IPTables is disabled (or stopped I guess; service iptables status command returns ...
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32 views

IIS 7 Reverse Proxy based on subdomain and port

Using a single Windows server with IIS7 I would like to reverse proxy three sites rewrite: http:// site1.mydomain.com --> http:// internal:111 http:// site2.mydomain.com --> http:// internal:222 ...
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1answer
35 views

How can I test my specific port is open or blocked?

I want to run a service which require to connect with some source using port 20000 but it is not connecting. I want to test my this port is blocked or open.
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4answers
106 views

Change SSH Port, but spoof on port 22

I have changed the SSH default port (by updating the Port attribute in the /etc/ssh/sshd_config file). But what I would like to do is still make it appear as if everything is working as expected if ...
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2answers
39 views

How does Apache know which site to load when having multiple sites at the same port?

I have setup 2 sites at my localhost. One at localhost:8197 and one at fc.localhost:8197 Of course, to make this work, I've edited my /etc/hosts file to include fc.localhost 127.0.0.1 So, these ...
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2answers
126 views

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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1answer
94 views

Cannot connect to port over the internet (works from localhost)

I'm running something (=Faye server) on port 9292: david@theta:~$ lsof -ni tcp:9292 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ruby 2406 david 13u IPv4 1579461398 0t0 ...
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1answer
49 views

iptables port forwarding from public ip but not from 127.0.0.1

i have an issue with my network setting and i need a port forwarding a bit advanced. I need : - All packets that arrive on my public_ip on port 54321 to be forward on port 12345 but i don't want any ...
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1answer
55 views

Is there a well-known port for logstash-forwarder?

I'm setting up a few logstash-forwarder agents which will send logs to a central Logstash server, and need to choose a port for Logstash to listen on. After doing some searching, there doesn't seem to ...
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43 views

Forward ports Fotigate, multiple ports

I need a you guys help. I can not solve , I need ideas . I am implementing a FortiGate 140, my difficulty being to perform port forwarding , I need make redirecting a ip in the case . example : ...
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1answer
117 views

How does Windows 2008 specifically select ephemeral ports (does it test to avoid conflicts)?

I have a server application which uses permanently connected incoming ports within the range that W2k8 now uses in the IANA recommended range of ~49000-65000. (For legacy reasons it's extremely ...
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2answers
280 views

Ports Open but Not Accessible Ubuntu 14.04

I've read so much and tinkered with so much that I don't even know where to start. Port 80 and 22 are open and accessible both inside and outside the local network and work fine. However, 443 and ...
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216 views

Nginx secure port 443 is not opened/ connection refuse

I have installed nginx on my ubuntu VM. There I want Nginx to listen 443 port. My configurations are as follows. server { listen 443; server_name wso2test.com; ssl on; ...
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1answer
37 views

Measuring request response time by port

So, I'm currently working on a project in which I spin up a set docker image on a number of different machines and configurations. This image basically contains a web server that accepts a number of ...
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2answers
762 views

nginx - [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

this made me crazy! I want to use nginx on port 81 and apache on 80. apache works correctly but when I want to start nginx I get this error: nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address ...