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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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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Port forwarding to internal IP [on hold]

I just installed the apache2 webserver on my raspberry pi, and tried to forward port 80 & 443 to it. It has the internal IP 10.0.0.11 . The pi is behind two routers. (router-IP 192.168.1.13, or ...
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35 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
15 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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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
142 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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4 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
29 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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16 views

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
54 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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52 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
211 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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20 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
32 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
92 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
32 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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88 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
56 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
36 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
40 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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34 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
84 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
116 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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81 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
30 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
339 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 ...
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1answer
22 views

What does unknown connection state mean [closed]

When using a port monitor, I noticed that the states of some of the connections where categorized as "unknown". What does this mean?
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2answers
95 views

Unable to add allowed VLANs to trunk and port not trunking

I am unable to add any VLANS to be allowed on trunk and the port is not trunking. I've tried: Switch0#configure terminal Enter configuration commands, one per line. End with CNTL/Z. ...
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1answer
62 views

Unable to remove a port from default VLAN

I am unable to remove a port from my default VLAN. I've tried: Switch(config)#interface FastEthernet 0/1 Switch(config-if)#no switchport access vlan 1 It has no errors but when I check it using: ...
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XenServer 6.2 not forwarding ports to VMs

I have a XenServer 6.2 with OVH with 4 additional IP addresses. For 2 VMs that are installed all is working fine. I created now a new VM with CentOS 6.6, added the virtual MAC OVH assigned me for ...
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Many webapps, one vps

Might be a noob question, Google and SF searches didn't turn up anything super useful. Could be using the wrong words here. I've got a vps, with one port 80 app running on it. I'd like to add two ...
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1answer
93 views

What is the best way to measure latency via a “telnet to port” test, preferably with built-in Linux tools?

I'm writing a Graphite/Diamond collector measuring network latency. Specifically it should measure the time it takes to open up a connection to a port on a remote server. And it needs to work via ...
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1answer
29 views

Solaris 11 / OpenSolaris - stop processes from listening?

I would like to write a script to secure Solaris 11 servers in preparation for internet access. In addition to enabling ipfilter, I would like to disable network-accessible services that are not ...
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1answer
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Port 5005 on my VPS is listening, but closed

I have a program running on port 5005, and the port is listening and accessible via localhost: znc-admin:~/.znc$ netstat -tulpn | grep 5005 (Not all processes could be identified, non-owned process ...
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1answer
94 views

nfssvc: Address already in use

I have installed nfs server using yum in my centos 6.3 box. But I couldn't start it. Any idea? # /etc/init.d/nfs start Starting NFS services: [ OK ] Starting NFS ...
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1answer
113 views

Domain controller is not listening on port 445

Is there a way to find why the DC is not listening on 445? -> Firewall rules checked , no denies found and the traffic is allowed. -> file share and print share services running. What else to check? ...
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1answer
228 views

AWS EC2 Ubuntu 14.04 Instance smtp port forwarding from 25 to 2025

I am trying to step up port forwarding from port 25 to port 2025 on the same AWS EC2 Ubuntu 14.04 instance using iptables. I am using port 2025 to receive income emails using Alfresco. The first step ...
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138 views

OpenVPN Port forwarding on a OpenVZ VPS

I've been trying for the past 3 hours to forward the 443 port from my client to the 20443 port on my server (CentOS 7 on OpenVZ), so i can access it on myserverip:20443. I have OpenVPN Access ...
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3answers
66 views

ProFTPD and firewall configuration for PassivePorts

I use ProFTPD on my server, and when I try to connect to my server with FileZilla or WinSCP, I have this error : Command: MLSD Error: Connection timed out Error: Failed to retrieve directory ...
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1answer
124 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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70 views

Can't access directadmin webinterface [closed]

Since today I can't access my directadmin webinterface (using port 2222). I gues it's a bind problem with port 2222. [root@server directadmin]# ./directadmin b200 Debug mode. Level 200 Converting ...
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2answers
112 views

IPTables only solution to block any IP address who has made too many connections or reconnections

I’m looking for an IPTables only solution to block any IP address who has made too many (e.g. more than 5) connections or reconnections within a short period of time (e.g. 1 minutes) on a certain ...
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1answer
333 views

Does closed Port 25 cause mail to be marked as spam?

I have a web server where I have installed Postfix for sending emails only. All incoming mails will be handled by google apps and not my web server. Using iptables rules, I have blocked all incoming ...
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60 views

Do blocking input ports increases security?

1-Do blocking unused input ports in firewall increases system security? How? (as there is no daemon listening on those ports anyway) 2-Do dropping those unused ports will positively or negatively ...
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241 views

Test port reachability from a remote host even though the port is not bound to a service?

I need to check whether a remote host is able to reach a specific port. At the time of test the service bound to that port will be down. The possible issues that the test would address would be : ...
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2answers
122 views

Cisco 887VA - Cannot open port 110

I am trying to configure a Cisco 887VA at work to open port 110, but no matter what I try, it doesn't seem to work. The router is accessed from within the building via a web UI but require CLI ...
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1answer
58 views

tomcat-webapp not accessible via port after windows-update

we are running 4 Virtual Machines on a MS HyperV Host. On one of the VMs (192.168.50.15) we have multiple Tomcat-Webapps on separate ports - 9010: Jenkins - 9020: Atlassian Jira - 9030: Wiki .. ...
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151 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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275 views

Node.js websocket error “Error: listen EADDRNOTAVAIL Error: listen EADDRNOTAVAIL”

Application work fine on localhost .but when its connect to server it getting error. I connect server through port 22 But my app connecting server port 80. This is the error Error: listen ...