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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2answers
333 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
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1answer
381 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 ...
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1answer
92 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 ...
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4answers
2k 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 ...
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2answers
186 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 ...
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1answer
503 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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1answer
1k 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 ...
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1answer
86 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 ...
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1answer
392 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 ...
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1answer
80 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?
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1answer
454 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 ...
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1answer
59 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 ...
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1answer
41 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 ...
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2answers
3k 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. ...
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2answers
2k 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 ...
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0answers
279 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. ...
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1answer
76 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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7answers
2k 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: ...
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1answer
884 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. ...
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1answer
165 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
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1answer
315 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 ...
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1answer
59 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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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 ...
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5answers
221 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 ...
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1answer
633 views

Open Port 123 to change Server time [duplicate]

How can I actually open port 123 on my CentOS server, so I can synchronise my server with another server's time? I couldn't be able to open 123 port using google guides.
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2answers
215 views

Cannot connect to port 25 despite not apparently being blocked on the network, and firewall switched off

This is driving me up the wall. I cannot telnet/paping port 25 on an a specific host/ip on one server. I can telnet/paping it from any other computer on the same network. I have tried completely ...
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1answer
103 views

Two apache servers using same port?

so I have two apache servers on the same system. Basically what I'm trying to figure out is if since I have 2 different IPs running on my system is it possible to have two different apache servers ...
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2answers
2k views

Debugging a connection refused response on port 21

My colleagues and I are having trouble accessing Heart Internet's FTP servers. We are running a mixture of Macs and PCs and we have a Linux box in the office too. None of our machines can connect. ...
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1answer
785 views

Changing the Virtualmin, Webmin and Usermin default ports

I am attempting to change the default ports for Virtualmin, Webmin and Usermin on an Ubuntu 12.04 server. After doing the below, I am only able to access the Usermin console. Opened port 9988 on ...
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0answers
140 views

set DMZ server on modem that not support DMZ, using port forwarding

I have to see an application server from outside of my network, but the modem that I am using is a Zyxel P-660-HN-T1H that not supports DMZ server configuration.So, which port(s) I should forward to ...
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1answer
571 views

Rewrite domain.com:3000 to port 80 with Apache

I'm hosting two applications on my web server, one is a Drupal site, and the other is an Errbit installation, which is a Ruby on Rails application. The URLs looks something like this: ...
3
votes
1answer
239 views

How to disable Xvfb using TCP ports when using pyvirtualdisplay (Python)?

Trying to use pyvirtualdisplay for Python to start some applications with a virtual Xvfb X terminal. However, we've seen port clashes and would like to disable Xvfb from using TCP ports. I have ...
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1answer
77 views

Whats wrong with my iptables?

Problem I cannot get requests to my server on port 80 to redirect to my client on port 8080 Server I am using a CentOS 6.3 VM as the server, the client is an Arduino Server eth0 - 172.16.145.139 ...
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1answer
975 views

Linux networking port exhaustion

I've done as much research as I could on this without digging right off in the kernel source. There seems to be a large amount of disinformation/incorrect info on the subject, so I hope this answers ...
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1answer
153 views

Programmatically interfacing with Managed switches (Cisco 3750)?

I work at an organisation that has a few thousand computers and around 100 switches. To help with the stock take for the computers I would like to programmatically access the managed switches to find ...
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1answer
861 views

How to get port redirects for two Servers running on same server?

I have an Amazon cloud running which is hosting two tomcat instances (ports 8080 and 8081) with each tomcat running a web application (foo and bar) for different customers. However I am having a ...
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1answer
60 views

How to diagnose why a port is broadcasting a “ZeroWindow” status

I have two CentOS servers (one is an app server, the other is a DB) communicating over a port. Every once in a while, the application server starts broadcasting that the port connected to the DB has a ...
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1answer
141 views

natd redirect_port didn't work

I have an virtual box freebsd 9.0 installation, on which I have working moinmoin2.0. Moin works on 127.0.0.1:8080 and I want to get access by external IP, e.g. 192.168.1.145:80. I try to use the ...
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2answers
180 views

Accessing website from two ports - Apache config

I have a website setup and want to be able to access the same site from two different ports. Does anybody know how I would do this? For example, I want to be able to access exactly the same at ...
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2answers
52 views

IIS way to control remote port openings

After my browser connects to a server page, a numerous backwards connections from server to browser are opened. Assuming I am the admin, is there any way to control the remote ports range from server ...
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2answers
176 views

can't access apache via custom port

I have configured apache to Listen on the port 80 and 4986 I can access it on virtualhost on port 80 but can't access it on port 4986 I have tried lsof -i:4986 : apache2 26669 www-data 6u IPv6 ...
0
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1answer
104 views

Do an os scan with nmap only

Is it possible to do an OS detection scan with nmap without scanning a port? I really need only OS detection and try to reduce the amount of traffic as much as possible. By the way what is the most ...
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1answer
118 views

psad does not detect nmap [closed]

I am new to this and just installed psad. I ran nmap several times on a server but psad didn't log this psad --Status. I configured it like this: ...
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0answers
64 views

Multiple Ports Forwards, Most Working, but Not All?

So I have this ASA5505 setup and pretty much everything works, except a couple key port forwards. Can anybody spot ANY reason why SOME port forwarding would not work? Specifically I know the 50000 ...
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2answers
49 views

Why adding some port to IP address redirect to another IP? [closed]

I have a ubuntu server inside a router. And I have setup a DDNS (for example, example.com is the domain name) to point to my dynamic IP. The port 22 is forwarding to port 22 of ubuntu server, configed ...
2
votes
2answers
1k views

Can I run two server applications on port 80?

I am currently running nginx on port 80, with the configured server names as example.com and www.example.com. I also have a Flask application that I would like to have accessible through port 80, but ...
0
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1answer
83 views

SFTP source port used by client

What port is used by a client when connecting to SFTP server listening on port 22? In which range can be that port? Does that range depend on client application used, or it depends on operating ...
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2answers
303 views

Re-routing incoming network traffic from sub-domain to specific port on Windows 2008

I'll do my best to explain this. I've got a Windows 2008 server with TWO local intranet-sites running on it. The first website will open if you just type in the name of the IP address - ...
0
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1answer
199 views

Firewall connected to a switch using 2 ports (LAN & DMZ), but switch management talks on DMZ port

Someone let me know if I'm off track here. I'm setting up a firewall with 3 ports configured (WAN, LAN, and DMZ). The LAN and DMZ ports both connect to the same switch, on which I will configure a ...
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1answer
43 views

How to alias a range of ports to a specific port

I have a service running at port 3000, how can I forward ports [12000 to 14000] (2000 total ports) to the port 3000 with one command. I don't prefer to manually add each port though. Any ideas?