a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts

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How do I with ufw deny all outgoing ports excepting the ones I need?

I did the following: ufw default deny outgoing, sudo ufw allow out 80 which I thought would let me use the Internet but didn't can y'all help? Also are there any other ports used by Ubuntu for which ...
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1answer
122 views

Juju security model issues

What plans are there to extend the security model in Juju? We see two significant issues with the current model - no internal firewalling within an environment, and the inability to expose ports to ...
2
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1answer
349 views

ufw firewall disabled - How to turn it back on?

I am using Ubuntu 12.04 and just recently noticed, that my ufw-firewall is turned [off]. I know It's turned [off] by default, but when I set Ubuntu up, I turned [on] the firewall with: sudo ufw, but ...
3
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1answer
647 views

basic security tools and packages that should be installed on a public facing web server

I'm a newbie in this world and I do not have a lot of knowledge about how security works on Linux systems. I recently created a droplet on DigitalOcean with Ubuntu 13 and I've been setting it up by ...
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1answer
310 views

Ubuntu forward ports, default state, forwarding not working?

im running ubuntu 12.04.4 server. I been googling the nett for answers, but could not find any.. I would like accsess a few web-gui's on my server. I have forwarder the ports in my router, worked when ...
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2answers
1k views

Problem with ufw enable: libkmod: ERROR ../libkmod/libkmod.c

I am trying to enable ufw and this is the output: root@p:~# ufw enable Command may disrupt existing ssh connections. Proceed with operation (y|n)? y ERROR: problem running ufw-init libkmod: ERROR ...
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1answer
585 views

Iptables and bind9 to forward to google's dns

Hello i have a very hard time on getting along with iptables and bind9 as my internal network dns server. It's configured to forward my queries to google's dns (8.8.8.8). The main problem is i can't ...
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2answers
214 views

Why does DEFAULT INCOMING DENY not stop Firefox from working?

If UFW is actually not an application layer firewall but a "interface to iptables", how can it be if I have by DEFAULT INCOMING DENY and OUTGOING ALLOW setting that ANY internet application is ...
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1answer
235 views

Need help to make this file work in iptables

I came across the following example of how to use iptables to block internet access when the VPN connection is terminated abruptly: iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ...
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1answer
666 views

Server unexpectedly closed

So I know that similar veins to this topic have been posted, but mine specifically deals with the fact that my SSH login through Putty worked from my desktop and my laptop. However, after carrying ...
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3answers
818 views

apt-get does not work without an internet connection. How can work around this?

I have a host which is firewalled to the point where apt-get is unable to download packages. That host does not have access to a proxy. I know in gentoo I could work around the problem by fetching ...
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1answer
169 views

enable port 9696 on ubuntu server

I am using ubuntu server lts 12.04 on vmware virtual machine. I need to enable port 9696 which is blocked or filtered. When i use the nc -v -w 1 localhost -z 9696 command it shows me the following ...
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3answers
601 views

using nmap for information regarding web host

am trying to get info of host run in linux about open/closed port the host is attacked randomly by hackers changing the content of the page.deleting files,homepage content changed. how can it be ...
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0answers
69 views

Port won't open! [duplicate]

I have a server that want to allow connections into it through port 25565, but when I test on http://www.yougetsignal.com/tools/open-ports/ it says they are closed? I have no outfacing interface ...
7
votes
1answer
364 views

Why are certain things able to get through ufw firewall?

I should say up-front that I am TOTALLY new to Linux, Ubuntu, and the technical side of networking. I am setting up Ubuntu on a server computer and have learned a bit about configuring the ufw ...
2
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0answers
369 views

UFW is DENY/DENY, but PACKETS are still getting out of my ethernet device. Why is this?

Hello, I have a question. I would like to use the UFW Ubuntu Firewall to lock both Input and Output completely from the server to ensure no packets are sent initially as a baseline. I enabled UFW, ...
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1answer
146 views

Setting up Ubuntu server with firewall - do I need 2 NICs?

Assume a LAN where 4 port ADSL Router, Server and PCs all connect to a network switch. Apart from working with the server, the workstations must have restricted access on what sites they can use. For ...
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2answers
159 views

Where did I fail with my basic iptables setup?

I installed iptables on a VPS (Virtual Private Server from openVZ) - Linux 2.6.32-24-pve #1 SMP Fri Sep 13 07:29:30 CEST 2013 i686 GNU/Linux. I also installed: apt-get install iptables-persistent ...
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1answer
308 views

UFW locks me out of server everytime I run it

Background: I'm setting up a new 12.04 instance on a VPS with a new provider.The VPS provider only offers a 32bit image but that really shouldn't matter here. I have no local access to the machine and ...
2
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1answer
237 views

Can't Get UFW Firewall to Allow Anything

I'm trying to set UFW (using GUFW) to create a firewall that only allows network connections when OpenVPN is connected. So in GUFW I deny incoming and outgoing connections and enable the Firewall. I ...
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2answers
1k views

SSH tunneling over SSL

On one of my systems there is a firewall forbidding any outgoing unless http(s)... Some users have to ssh but they can't.I tried first to run ssh on port 443 but with no success. I googled it and ...
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1answer
48 views

Setting up a basic firewall for 1st time user

Could anyone tell me some basic commands to set up my firewall. I already have ufw. What commands should I use for a basic security?
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1answer
146 views

why Ubuntu Firewall not showing verbose?

Even Ubuntu Firewall in running mode , I am not getting the data. may I know why ? root@ubuntu:~# sudo ufw status numbered Status: inactive root@ubuntu:~# service ufw start start: Job is already ...
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2answers
1k views

UFW not blocking connections to docker instance

I have a webservice running inside a docker instance which was run using the following command: sudo docker run -d -p 4040:4040 .... My UFW rules look like this: ~ sudo ufw status Status: active ...
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1answer
94 views

Firewall Activation Process

How do I activate my firewall through the terminal and is it Necessary or done automatic. My regards team! thmoabw
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3answers
267 views

open ports in ubuntu 13.10

Ubuntu comes with no open ports. Mine is a fresh install with only skype xbmc and wine added. I installed GUFW and set it to ON. When I do sudo netstat -tulpn | grep LISTEN I got: tcp 0 0 ...
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0answers
159 views

Configuring ufw and iPredator VPN

I am running a VPN via IPredator on Ubuntu 12.04 Desktop, which works perfectly, when ufw is disabled. When I enable ufw, I logically cannot establish a connection. IPredator states that I have to ...
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1answer
72 views

Samba problem — is it a firewall issue?

I have just installed Ubuntu 13.10 on a computer I use as archive for other machines. I need Samba working from various Windows 7 machines. I have confirmed that smbd and nmbd are both working, and ...
2
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4answers
3k views

How to deny an ip address from connecting to my system?

Is there a way to deny an IP address from connecting to my Pc? Is there a way to deny an Ip from connecting to specific Port?
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2answers
3k views

how do you create an app profile for ufw?

Ufw has a command that lists out profiles to which you can further explore their profile definitions $ ufw app list And $ ufw app PROFILE {app profile title} I was wondering how you can ...
2
votes
1answer
29k views

How to open a port?

I have ubuntu 12.04 and I'm not able to allow certain port in my firewall. So I basically said I will allow everything but it's still not working. Please help. nmap on this machine from other machine ...
3
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2answers
8k views

Help! My server has been hacked - .IptabLes and .IptabLex in /boot [closed]

I'm running a Ubuntu 6.06 dapper server and it has been hacked. I'll admit up front here that I'm a programmer and not a system administrator so even though I've worked with Unix/Linux for years my ...
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1answer
971 views

how do I enable firewall zones for NetworkManager

I am trying to use the default network manager for ubuntu 13.10 to connect to networks. Despite any config changes for example, enabling UFW, does not allow for the changing of this profile scheme. ...
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1answer
202 views

Is it necessary to have a Firewall in Ubuntu?

I was wondering if a Firewall could give some more security, and if yes which one would you recommend.
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0answers
90 views

Allow users to access specified IPs only

I have a computer that offers both a VPN and a SSH server running three (separated) VPN networks. All users log into the server via ssh. However, I want that only certain users can communicate to ...
0
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1answer
315 views

Server not found problem

I've encountered an problem, maybe trivial - when I try to load this page: http://home.thep.lu.se/~torbjorn/Pythia.html I recive classic 'Server not found' page. I'm using Mozilla Firefox on Ubuntu ...
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1answer
98 views

Trace IP from MAC

I have a Virtual Server running Ubuntu at a hosting provider. In the last couble of month I have experienced a dramatic increase of inbound traffic. All of it being UDP packets. Looking in the logs ...
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1answer
2k views

ubuntu server 12.04 and ufw failure on startup, and several module not found errors

I have problem enabling ufw on startup, it works fine if I do: sudo ufw enable. But after restart puf, I've to redo it. I tried: sudo /lib/ufw/ufw-init stop ; sudo /lib/ufw/ufw-init start And ...
0
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1answer
564 views

Connect to mysql database on Ubuntu host from windows guest

I have Ubuntu 12.04 on my laptop and have a Windows 7 guest on (VMWare). I would like to connect to the mysql database on Ubuntu host from Windows guest.Kindly tell me how to do the same. I have tried ...
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2answers
76 views

Can removing GUFW create dangers for my system? [duplicate]

I learned that the firewall settings for 12.04 were by default disabled so I went to the software center and downloaded and enabled the GUFW firewall gui config. I thought having a firewall would be a ...
0
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2answers
5k views

Why can't I connect to SSH server from Ubuntu client? (while windows client is okay)

I have configured an ssh server on a Ubuntu 12.04 LTS machine. I changed the listening port to the one different from the default port 22 (that's the only change I made on the server). I am trying to ...
2
votes
2answers
361 views

UFW and firewall

So I recently installed ubuntu and I have been working with it no problem.While browsing through the security guides (specifically: https://wiki.ubuntu.com/BasicSecurity) I noticed this: "enable the ...
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1answer
69 views

Importing GUFW rules?

Is there an easy way to import ready rules for uncomplicated firewall? like ready in and out rules with IPs and everything.
0
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1answer
297 views

OpenBSD Packet Filter firewall in Ubuntu

Is there a way to use OpenBSD's Packet Filter firewall in Ubuntu?
3
votes
1answer
873 views

Are my ports opened?

Im using virtual server on hosting. There is Ubuntu 12.04 LTS. Im building pool websites, and stratum mining. I can connect to stratum on port 3333 via minerd on server, but cant connect from outside ...
2
votes
1answer
1k views

I can not connect on ubutu service port 3050, from my network

I have the Firebird service running on my ubuntu server and it is working fine inside the server. But when I try to use from another machine it does not work. Like a firewall issue. I did make some ...
0
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1answer
30 views

Unresolved error with browsing a website : Error 404

I am running on Ubuntu 13.04 64amd. I cannot access the website which I built online through all my browsers. It redirect to the server and it says the Error 404. I asked from the server (Through ...
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1answer
155 views

Ubuntu VPS > restrict openerp for some user

In Ubuntu VPS server, openerp is running and anyone can using this web interface. my vps server is: http:// <Public IP>:8069/. I want to allow some mac addresses and restrict to all. Here is ...
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1answer
151 views

How to allow SSH from internet when it is forwarded to a non-standard port

I'm configuring a virtual firewall using Shorewall and have a rule to forward the external port 2222 to internal port 22: DNAT inet lan:192.168.1.2:22 tcp 2222 where 192.168.1.2 is the ...
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1answer
310 views

Remote ACCESS - SSH listening port filtered out by Firewall?

I am trying to access a remote server, with no physical access. I have accidentally changed the previous listening port in SSH and forgot to change it in the firewall rules. In firewall 15000 is ...