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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Solaris ethernet ports: nge2 and nge3 are missing

There is a Sun X4100 with an interface nge0 which is configured and working. The server has a group of 4 network jacks in the back and nge0 corresponds to ethernet port 0. I tried enabling ethernet ...
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2answers
130 views

Linux Port 80 to redirect to a Windows box

I have 2 servers here at work. One is a Windows 2008 Server R2 (for safety's sake, lets use 192.168.1.100) and the other is a Fedora 14 (192.168.1.101). Currently when you hit our subdomain, ...
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2answers
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fwbuilder: port forwarding incoming 222 port requests to a local machine 22 port

I am using fwbuilder to setup my iptables rules for a public server. The idea is to forward external requests from the 222 port to a local machine's ssh port. The settings i used are: NAT section ...
4
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1answer
607 views

How to install newer port (PHP >5.1) on older release/world?

On my FreeBSD (home) server I have installed 6.2-RELEASE-p8. This "includes" PHP 5.1. I need to install PHP 5.2 now (because of a dependency, 5.3 would probably also work). Now my (newbie) question ...
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1answer
180 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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5answers
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Can't launch glassfish on ec2 - can't open port

I'm trying to start glassfish on an EBS-based AMI of Ubuntu 10.04 64-bit. I have used glassfish on non-ec2 servers with no problems, but on ec2 I get this message: $ sudo -u glassfish bin/asadmin ...
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3answers
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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) ...
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7answers
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Stealthed vs Closed Port

I was reading a website about the difference between stealthed and closed ports. http://www.grc.com/faq-shieldsup.htm A closed port will echo a packet if closed. However, a stealthed port will not ...
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2answers
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check port open without telnet [closed]

What do people use when Telnet is not installed to check a port is open and reachable? E.g. I used to use the technique of telnet <destination> and know it was there, even if telnet could not ...
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2answers
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Force apache to server different directories on different ports?

For example, say I have my htdocs in: ~/public_html and those documents are being served on port 80. Is there any way to make apache server documents in: ~/public_html/something on a different ...
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5answers
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What is MonkeyCom on port 9898?

In /etc/services on a few machines I've checked, port 9898 is associated with a service called MonkeyCom: monkeycom 9898/udp # MonkeyCom monkeycom 9898/tcp # MonkeyCom The first ...
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4answers
646 views

Varnish on 80, nginx on 8080, on which port to put jenkins?

On my staging server, I have Varnish + Nginx. They are on port 80 and 8080. Given that I have to install jenkins, on which port I have to bind it ? (which is usually 8080 but it's already taken)
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3answers
342 views

Open Ports: Apache vs. IIS

I just had an interesting meeting with security guys and the main point of this meeting I wanted to have some backup on is: Apache is secure, because it only needs port 80 and 443 (for http and https ...
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4answers
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How do I save iptables config?

I have just installed Webmin on a Ubuntu server. According to the docs you need to open up port 10000 (which is what Webmin runs on), with this: iptables -A INPUT -p tcp -m tcp --dport 10000 -j ...
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4answers
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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 ...
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2answers
612 views

How to open port 555 on Linux / Debian

I want that phpmyadmin to work at mysite.com:555 (555 port) # phpMyAdmin default Apache configuration <VirtualHost *:555> Alias /phpmyadmin /usr/share/phpmyadmin <Directory ...
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1answer
155 views

Firewall Port Mapping, Good or Bad?

Is it worth the trouble to map open ports in the firewall from some inconspicuous port number to the correct port number for a given service? Or is it simpler and similarly secure just to present ...
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1answer
585 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 address: play.example.com. After many ...
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2answers
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How to determine which TCP/UDP ports are being opened by a given process (linux)?

I know how to do the opposite (find out what process has a given port open) using lsof or netstat, but extensive research on Google hasn't helped me solve the reverse problem. I know I could use ...
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1answer
5k views

What is “Radan HTTP”?

There is a service using the 8088 port on a Linux server I use. It identifies itself as radan-http, and indeed it's on the IANA port list. It is apparently being used by Nginx. But, despite a fair ...
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3answers
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How do I check if a port is open on Red Hat Linux/CentOS

I've written a program that is suppose to implement SLP (rfc2608) and I'm having trouble testing it. I'm not sure if the port is closed or there is something out there dropping my multicast ...
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3answers
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OpenBSD has open ports in default installation

I have been considering replacing Ubuntu with OpenBSD to improve the security on my local server. I need to have ssh access to it, and I also need it to serve static web content - so the only ports I ...
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3answers
882 views

Ports being used on Windows XP

I have a MySQL db running, or I want to see if its running. What command may I use to see which ports are active and what they are running?
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2answers
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is TCP port exhaustion real? [closed]

How fast would one need to allocate ephemeral ports in order to get into the TCP port exhaustion condition? I was told there are ~4k (older Windows), ~16k (newer Windows) or ~28k (RH Linux) ports ...
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2answers
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How to Identify Port to a Process?

I'm running a RedHat 5.5 and I was wondering how I can identify a port to a process. This is the output of netstat and I am trying to find the process associated with port 35670: $ netstat -tulnp ...
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1answer
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Configure SSH to listen on Port 443 on a specific IP address [duplicate]

Possible Duplicate: Allow SSH only on one of a servers IP addresses I have two IP addresses, IP1 and IP2. Currently I have set sshd to listen on port 22 and port 443. The problem is that it ...
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3answers
881 views

Directing DNS to different ports

Greetings all, I have a server with two tomcat services (one being run on port 80, the other 8080). What I'm wanting to achieve is to have two different DNS records for these two ports, so they'll ...
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4answers
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outbound ports that are always open

What are some ports that can NEVER be blocked outbound in firewalls, as doing so will stop basic internet use? Some I can think of are: port 53 udp/tcp -- dns, blocking this will prevent users ...
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2answers
65 views

Is there a section of ports reserved for in-house use?

Example uses A backend webserver that is called by the world-visible webserver. A static NAT table for the public to use a port number to specify which server they are connecting to. A software that ...
3
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4answers
161 views

Linking Domain Names to Port Numbers

I have a [game] server (CentOS) that has about 10 used ports. For one game in particular, I have 2 servers: a private one and a public one. The IP for them is the same, so to differentuate between ...
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4answers
859 views

How forward one port to other using ssh or any other tool?

I have a legacy application listening on port 5050 bound to localhost interface (i.e. 127.0.0.1). This app runs on a Linux box (an embedded system). I have an app, lets call it App C that runs on PC ...
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3answers
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Which ports to open for DB Mirroring

We have two physical servers on the different area protected by firewalls. We need to use DB Mirroring for our purpose. So which ports we need to open between two area for using MS SQL 2008 DB ...
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1answer
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On Linux, how can I tell how many ephemeral ports are left available?

Is there a method in Linux to check how many ephemeral ports are left available? I occasionally see "Address already in use" errors as a result of running out of ephemeral ports. A machine reboot will ...
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3answers
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Why do nmap -p <port> and nmap -A scans show different results?

I have a C# application that I've written that listens on port 789. It is running on a Windows XP Professional computer. Running netstat -an | find "789" TCP 0.0.0.0:789 0.0.0.0:0 ...
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1answer
303 views

Automatic/scheduled check for open ports on list of servers

I need a way to configure a scheduled check for open ports on a list of servers and to get notified if something has changed from last check. what's the best way to do it? If there is some solution ...
3
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1answer
970 views

Limit maximum incoming connections to a port using iptables

I have a server that has apache listening on a number of ports. Some ports are used for configuring the server, and another is used to download large files. My problem is that when I have a large ...
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2answers
599 views

can visualsvn server be bound to more then one port?

I know i can go to the visualsvn server properties and specify the port and IP address. But what i would like to know is if i can specify a different port for different IP addresses? For example, say ...
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3answers
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Port 135 / epmap

I'm looking at securing a web server (Windows Server 2008). A GRC port scan recommended that I close down port 135 (https://www.grc.com/port_135.htm). However, I've done this before with Windows ...
3
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1answer
395 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 ...
3
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1answer
239 views

Unable to access NTPD server except on loopback address Centos 6

I can only get results from: ntpq -p localhost or ntpq -p 127.0.0.1 If, from the same server, I try it as either the external IP address or domain name then it times out with no response. ntpq -p ...
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2answers
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How do i open the RDP port in Linux?

Prologue I have a MacBook and i want to connect to a remote Windows machine, which is connected to a Linux Server. When i'm at my locally there in the network, i use the ...
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4answers
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how to check connectivity to server by windows tools?

I need to check if client can connect to server on specific TCP port. Server is listening on it. Tried "telnet server_IP port" but telnet is stuck when I see that it's connected to the server. Seems ...
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2answers
203 views

Port Knocking and TCP/IP within the OSI model

I have read that Port Knocking can be subject to false negative (type II error) due to the optimization techniques of TCP/IP. A correct port knock given by the client may be read as incorrect by the ...
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2answers
3k views

MSMQ via HTTP - Why do we need TCP Port 1801?

Context: MSMQ, Windows Server 2008 (either "regular" or "R2" editions) According to MS online documentation here: http://technet.microsoft.com/en-gb/library/cc725576%28WS.10%29.aspx MSMQ messages ...
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2answers
430 views

Is my linux firewall secure?

I am newbie to linux firewalls and trying to setup my systems firewall for a public facing computer. Here are my requirements: Ports 80 and 22 should be open for HTTP requests and SSH logins Since ...
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2answers
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Where is the webmin port number stored? [closed]

I made a typo when changing webmin's port number; now, I don't know what it is. How can I change it?
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1answer
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What port does IIS 7 use to connect to another IIS server?

I'm trying to connect to another IIS server and I know the windows firewall is turned on on both servers. I'd like to be able to create an allow rule, but what port does IIS 7 use to connect to ...
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2answers
4k views

MS SQL Server Dynamic Port Range

I understand that a SQL server named instance will default to dynamic ports, and I know HOW to change that to a static IP: ...
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1answer
364 views

Do NATs verify the source port of a SYN received after a SYN has been sent?

I'm unsure of whether this question is more appropriate for stackoverflow or serverfault. If you think it's more suited for stackoverflow, let me know and I'll delete this and move it over. I have a ...
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2answers
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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 ...