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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3
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3answers
838 views

How do high traffic sites service more than 65535 TCP connections?

If there is a limit on the number of ports one machine can have and a socket can only bind to an unused port number, how do servers experiencing extremely high amounts (more than the max port number) ...
0
votes
0answers
231 views

Change default ssh port on Fedora EC2

I have changed my /etc/ssh/sshd_config adding multiple ports for it to listen: $ grep Port /etc/ssh/sshd_config Port 22 Port 80 Port 443 However, after a service sshd restart (which shown no ...
-1
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3answers
152 views

Hosting a web service on port 22… Is that possible? frowned upon? [closed]

I am trying to resolve a client's problem and I had an (bad?) idea... The problem : Client has two web servers running behind his wan router. (physical servers in his building) Each server hosts a ...
0
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1answer
101 views

access application through a specific node/app server in websphere

i have an application hosted in websphere 6.1. there are 4 application servers in a single node. each app server has its own http, listener port numbers. what i am trying to do is access the ...
6
votes
3answers
316 views

What is the difference between these 2 iptables rules?

Trying to allow incoming ssh traffic on port 22. Default behavior is to DROP all incoming traffic. I came across 2 articles on how to allow traffic. However, they are different. ## open port ssh ...
1
vote
1answer
157 views

Using Group Policy create Local Port that points to C:\scanbookdata\epl.txt

I'm trying deploy a local port printer which points to c:\scanbookdata\epl.txt using Group Policy. Below is screen shot of what I'm trying to do : I'm lost as how to go about this. Any help would ...
-1
votes
1answer
30 views

statistics on port 22 blocking [closed]

What are the statistics on port 22 blocking by firewalls in small and medium sized enterprises? We have a product that a customer installs on a PC, which communicates via ssh to our cloud server. It ...
0
votes
2answers
139 views

server sending hpoms-dps-lstn packets to unknown IP

I have a server running pacemaker with corosync and some standard services as mails, web, ssh... When I run wireshard in my network I keep getting those packets that my server is sending to the IP ...
1
vote
1answer
576 views

Configure Glassfish http-listener to Port 443/ 80

I want to configure the http-listeners in Glassfish 3.1.2.2 Build 5 under Linux. I changed the settings for the http-listener-1 to the port 80 and the settings for the http-listener-2 to the port 443. ...
13
votes
2answers
344 views

Ethernet port plastic plug blocking port access on server

I have Dell Poweredge server with plastic blockers inside their ethernet ports. My problem is that I don't know how to take it out. You can see photo of the plug here: I tried to pull them out, or ...
0
votes
1answer
73 views

Iptables log clent IP to file

Im trying to track whether some ports are being used, and what by, as I want to close them. I have made some iptables traffic counters, and have worked out is a small amount of traffic, coming into a ...
0
votes
2answers
308 views

Cannot restart RabbitMQ Service on Windows

I stopped RabbitMQ for a short time on my Windows (2012) server. However, when I tried to restart it, it would shut down again within about 30 seconds. The Windows Event Log had the following ...
0
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2answers
54 views

java http service on mac server with Apple server admin

I've written a simple com.sun.net.httpserver.HttpServer program that runs on a non-server mac. When I visit http://localhost:39600/test in a web browser, it gives me the correct response: "Here's my ...
0
votes
1answer
53 views

Securing SSH for cross site access

We have 2 servers, one each located at different geographical locations where we are considering using an rsync script to keep certain folders in sync. Our setup disables root login and password ...
1
vote
3answers
1k views

How to check a route exist between two hosts for a particular port?

How to check whether there is a route between two hosts for a particular port (e.g. 1433).
-3
votes
2answers
334 views

Remote Desktop listen on 2 different ports [closed]

I have a server which in the local network I would like to access remotely through the default RDP port 3389. Due to filtering services at work, the port 3389 is unavailable as many other ports. ...
9
votes
3answers
257 views

advantages in closing a port where no services are running

Are there advantages in closing a port where no services are running? What do I gain in terminating a connection at iptables level instead of what does it next (I guess OS).
0
votes
1answer
84 views

Redirecting port A -> B and blocking externally B

I want to redirect port A to port B and EXTERNALLY block port B. A = 9922 B = 22 (Yes, it's ssh, and NO I cannot change it in configuration.) I have three interfaces: lo (loopback) p36p1 ...
-1
votes
2answers
96 views

Nginx cannot work on ports other than 80 [closed]

I had Ngxin working just fine. But now I want to change my site to another port. I tried with my Drupal site and my bare-bone php script site. Both not working. My vhost is simple. server { ...
0
votes
2answers
76 views

Make Windows firewall list port numbers instead of port names

How can I make Windows firewall (Windows 7 or 2008R2) use port numbers for all ports instead of unhelpfully give you "PlayTo Discovery" or similar as the local port? In other words, no name ...
1
vote
1answer
363 views

Can Telnet to port 21 but not 25, 110

I am running postfix and dovecot on my Centos Mail server. Now I can send mail from the server to the outside, BUT I cannot receive mail from the outside. TELNET: When I telnet to my ip address to ...
0
votes
1answer
1k views

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 ...
1
vote
2answers
184 views

Limit FTP client ports?

Okay so I use the simple linux ftp client to download/upload files off ftp servers. I have an iptables firewall which blocks most of the ports and I have to close the firewall for it to work. Although ...
-1
votes
1answer
109 views

Real trouble for opening port in SQL Server 2008

I'm having trouble trouble opening port in SQL Server 2008 R2 Express Edition (http://www.microsoft.com/en-us/download/details.aspx?id=30438) even by disabling the Firewall. I also installed the ...
-1
votes
1answer
114 views

Access phpmyadmin (which is on a non-standard port) from my office network

On my webserver I have set up phpmyadmin to operate over port 8084 for security reasons. So to access it I would normally visit http://mywebsite.com:8084 In my office, it seems like this port is ...
0
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1answer
323 views

How to change default listening port on webbserver IIS 7?

How do you change the default port to which the webbserver IIS 7 is listening for incoming traffic to whatever portnumber? e.g. I have web application named "mywebapplication" published on SSL port ...
0
votes
2answers
228 views

Ubuntu Server SSH Connectivity Issues (Potentially Router) [closed]

I have a server set up with Ubuntu 12.04. I've installed OpenSSH, and I'm trying to access it from another computer, on another network, using this command (modified for the correct values): ssh ...
-1
votes
1answer
325 views

Iptables - source or destination check first?

So I'm running a server with iptables config and I've only been checking for destinations. Here is what the config structure is. Top of config has a list of ip addresses to drop followed by ...
0
votes
1answer
72 views

Open loopback port for remote access

I have a pyLoad machine in my local network which connects with autossh to my hosted virtual server so that I can access pyLoad from wherever I am. Now I want to have access to the API port which is ...
0
votes
4answers
1k views

connections on port 80 suddenly refused / server not responding

my dedicated server stopped responding to requests on port 80 today out of sudden, i havent touched anything in more than a month. its ubuntu 10, varnish + nginx + php-fpm, only 1 website. load is ...
1
vote
2answers
156 views

How can I release a port that is still in use but not bound to a process?

I'm running a Python application that spawns multiple processes. It uses port 56008 to listen for client requests. Sometimes after closing it the port it used is still "in use". There are still some ...
0
votes
1answer
340 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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votes
1answer
848 views

Port 22 is not responding [closed]

I'm trying to make the jump to VPS from shared hosting for better performances and greater flexibility, but am stuck with the fact that I can't access the machine via ssh. First of all, the machine ...
0
votes
1answer
66 views

Unable to setup HTTP Server so that external clients can access

I am running Red Hat Enterprise Server 6. It has Apache Server (httpd) installed and running on boot by default. My document files are kept in /var/www/html/web and I can access them on my computer ...
1
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1answer
236 views

Why does DHCP have fixed client and server port numbers

In most client-server-applications, the port number of a server is a well-known number, while the client uses a currently available port number. DHCP is different. Here, both the client and the server ...
1
vote
1answer
72 views

What happens, if the server runs out of ports?

If the client joins to a server, then there is a local port, and a remote port in each connection. What happens, if more than 65535 client tries to join to my server?
0
votes
1answer
363 views

Ubuntu 10.04, Paralles Plesk 11, Change apache port

I googled for the past hew hours just to found few sources which didn't help so far. My task is to change apache port to anything but 80. So far I have changed ports.conf which is included into ...
0
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1answer
53 views

Blocking Port 22 From Unknown IPs Security Measure

A server I'm working on has blocked all unknown addresses from accessing port 22 (via a firewall). An IP address has to be added to the firewall first via a control panel (or command line) before it ...
0
votes
1answer
38 views

Configure Firewall settings for local and public network

I have a VM on windows azure that is running an SQL server 2012 on windows datacenter 2012, I want to define a firewall rule so that the sql server can be accessed from anywhere in the private ...
0
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2answers
2k views

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. ...
0
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2answers
1k views

Difference between trunk and tagged port

I am reading some wikipedia articles and RFC 5517, studying VLANs, and I don't recognize the difference between a trunk port and a tagged port. From what the material I am reading says, a tagged ...
0
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0answers
167 views

Access Denied for Specific FTP Client

I have a couple FTP servers setup which I am unable to access using a particular client machine. The client is a Windows 2012 server in my company's network over which I do not have admin rights. ...
0
votes
1answer
68 views

Opening ec2 ports using security groups

I'm trying to open all ports up to a micro instance that I have set up, but it doesn't seem to be working. This is what I have: http://i.imgur.com/PHekagS.png Using paping, I find that port 22 is ...
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vote
7answers
1k views

Changing port 80 to 8080 in Apache

I'm trying to change the port used by a website from 80 to 8080. Here is my /etc/apache2/ports.conf: NameVirtualHost *:80 NameVirtualHost *:8080 Listen 80 Listen 8080 Here is my VirtualHost file: ...
0
votes
1answer
672 views

Block SSH access from specific countries

I found this handy script online, and would like to modify it to only block SSH access but I don't know anything about iptables and Im afraid Ill kill my system as i have no physical access to it. ...
-1
votes
1answer
143 views

jabber connection to another servers doesn't work under firewall

When firewall turned on, jabber server do not connect to another jabber servers. When turn off - all good. The config is (deny by default, allow all outgoing connections): Source Protocol Remote ...
2
votes
1answer
287 views

Setting up SRV records for a Minecraft server

I have a Minecraft server listening on port 25566, and I'm trying to set up an SRV record on my domain so you can access that game server by just typing the ip: play.gameserver.com. After many tries ...
0
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1answer
54 views

Multiple webservers behind firewall done correctly?

Basiclly I have a firewall and behind it i have a webserver which is a webportal for clients, a second webserver that hosts their webpages and a DNS server I want to route the traffic through that ...
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votes
1answer
118 views

How do iptables ports work? [closed]

Let's say, for instance, a user on the network makes a HTTP request to http://serverfault.com. I believe the destination port (dport) in this case is 80. What is the source port (sport)? If the user ...
0
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5answers
204 views

What are valid ports to use for SSH?

I have an internet facing web server that I also need to be able to SSH into. I'd like to update my server to change the SSH port from something other than 22 so there are fewer hits for unauthorized ...