a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
42
votes
8answers
2k views
What are the risks of NOT using a firewall (home computer)?
Since a password is required to be a superuser (to install and modify programs), what are the risks to not use a firewall under Ubuntu ? More particularly if I am using a NAT router ?
20
votes
4answers
4k views
Why is the firewall disabled by default?
Why is ufw firewall included in Ubuntu, when it is not enabled and pre-configured by default? Most users don't even know it is there, because no GUI frontend is provided.
15
votes
5answers
3k views
Is there a preinstalled or automatic firewall?
Does Ubuntu come with a preinstalled or automatic firewall? If not, do I need one?
I've read some articles about the advantages of linux over other operating systems about security (no need to have ...
14
votes
3answers
243 views
What automated intrusion notification/detection setup is good for home desktop use?
I've been using Linux for quite a while now and I always feel the need to have a passive software / script setup which can alert me of any suspicious network activities like scans, failed login ...
12
votes
1answer
4k views
How to block internet access for wine applications?
Is it possible to prevent specific wine applications or any wine application from accessing the internet? When using certain apps under Windows, they were trying to access the internet from time to ...
11
votes
8answers
2k views
10
votes
2answers
17k views
How do I know if my firewall is on?
I installed Firestarter, and configured my firewall.
But I'm in doubt : On boot, I sometimes see a [FAIL] marker, and to the left, I guess it was something like "start firewall". I can't be sure ...
10
votes
7answers
2k views
Alternative to Little-Snitch app-firewall?
I'm trying out Ubuntu. Been a Mac user. I like ubuntu a lot but I'm uncomfortable not having an app-firewall that reports what connections are being made to the internet. I find it unnerving to not ...
9
votes
1answer
491 views
Precautionary security measures for a home user? (firewall, antivirus, etc)
I just recently made the switch from Windows to Ubuntu, and I'm just a little paranoid when it comes to security measures.
I've looked around and from what I've read, security is not as big a concern ...
9
votes
6answers
6k views
How to control internet access for each program?
I would like to use a software to control which program may connect to the internet. I know that this behaviour is associated with the word "firewall", but some Linux users are very upset if somebody ...
8
votes
2answers
3k views
How to set up an Ubuntu 10.04 machine to accept ssh requests only from within the local network?
I am about to install 10.04 (from bare metal to replace 9.04) and I want to set it up so that I can shh into the machine, but only from other machines on my local network. (I.e., I want to reject all ...
8
votes
3answers
6k views
8
votes
1answer
269 views
Replacing my firewall rules
I've had an init script for many years that configures iptables for me and it has worked like a champ until now. After upgrading from 10.04 to 12.04 I started having firewall problems where the ...
7
votes
3answers
493 views
Can I be notified about blocked connection attempts?
My computer is running Ubuntu 10.10 and I would like to know if there is a firewall that actively informs me when a certain program is trying to access the internet or when a connection attempt is ...
7
votes
1answer
418 views
Getting Dynamic firewall from Fedora 15 into Ubuntu?
Just tried out Fedora 15 and noticed the pre-installed firewall application that I found much easier to use than any other previously tried out firewall manager.
Definitely miss it at my Ubuntu ...
6
votes
2answers
2k views
What do UFW's audit log entries mean?
I'm sometimes getting a lot of these AUDIT log entries in
...
[UFW AUDIT] IN= OUT=eth0 SRC=176.58.105.134 DST=194.238.48.2 LEN=76 TOS=0x10 PREC=0x00 TTL=64 ID=32137 DF PROTO=UDP SPT=36231 DPT=123 ...
6
votes
1answer
241 views
Securing Riak using Shorewall Firewall
I want to set up a Riak Cluster for a Web project.
However, I want to secure this cluster so that only My Web Server(s) can access Riak Cluster. Basically, I will have one or more Web Servers and 4 ...
5
votes
2answers
696 views
Ubuntu comes with firewall by default?
I understand the Ubuntu comes with firwallul UFW is true? There is a GUI for it? if so, what is his name and where do I download? It is possible that UFW notify us (like in windows with a pop-up ...
5
votes
4answers
6k views
What rules to use for UFW?
I've decided to enable the UFW that comes with Ubuntu just to make my system even more secure (especially after watching a video of a person whose computer actually got infected!), and I've enabled ...
5
votes
3answers
9k views
How to enable ufw firewall to allow icmp response?
I have a series of Ubuntu 10.04 servers and each one has ufw firewall enabled. I have allowed port 22 (for SSH) and 80 (if it's a webserver). My question is that I am trying to enable icmp echo ...
5
votes
2answers
6k views
“FirewallD not running” error when trying to install a printer
When trying to add my printer in a fresh install of 11.10 I get this error message. What does it mean, and what do I have to do? It worked fine in 11.04 (with hplip).
5
votes
1answer
1k views
What does this UFW log mean?
CC-02 kernel
[ 399.656733] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=192.168.2.11 DST=192.168.2.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=14158 DF PROTO=TCP SPT=47368 DPT=22 WINDOW=5840 RES=0x00 SYN URGP=0
...
5
votes
2answers
151 views
Reverse Firewall or Application Firewalls?
Firewalls are typically employed to prevent bad "packets" coming in from the outside world. But these days we are mostly behind routers and a lot of that danger is mitigated by the router. The danger ...
5
votes
1answer
185 views
How do I accept inbound connections for a specific program?
Windows firewall allows to specify a program that will accept inbound connections no matter on which port(s) is listening (instead of specifying the port(s) to allow for that program). Is this ...
4
votes
1answer
6k views
System log error when running Firestarter configuration program
Running latest Ubuntu ver. 11.04. Using Firestarter firewall configuration (ver.1.0.3). When Firestarter is run, an error message is returned, "Failed to open the system log. No event information will ...
4
votes
3answers
564 views
How can a non-geek set up a proper firewall?
Maybe a non-geek that knows of the existence of a firewall is already some kind of a nerd. If you have been a windows-user then it was rather easy to set up a firewall (I don't know if it was a good ...
4
votes
2answers
4k views
How can I make a specific set of iptables rules permanent?
Is there a "best practice" or standard to make a few iptables rules permanent? I mean: automatically applied upon a system reboot?
I am using a VPS with Ubuntu Server 10.04 LTS (Lucid Lynx).
Thank ...
4
votes
2answers
278 views
What additional security measures should I apply for Ubuntu?
So on my Windows 7 install, I've got multiple free malware/virus scanners and a firewall up. But I've heard that Ubuntu (or Linux in general) is much more secure by default.
So what additional ...
4
votes
2answers
2k views
UFW is not logging how do I troubleshoot?
I have set logging to high.
I am not seeing any log messages.
I do see the empty ufw.log file.
No messages in dmesg
4
votes
3answers
2k views
Firewall Settings for Personal File Sharing
I have ufw set up to allow samba connections, but this does not seem to allow files to be transferred through Ubuntu's "Personal File Sharing" using the Public folder. The share can be seen, but not ...
4
votes
2answers
98 views
Is it possible to block a webpage using ufw?
basically I have two machines X and Y.
I want to block "http:// <IP-of-Y-Here> /AFolder/" from machine X on HTTP port 80 using ufw.
Trivially, this can be completed (awfully) using ufw ...
4
votes
1answer
91 views
blocking all outgoing ports and its consequences
Is this the right way to block all outgoing ports? : ufw default deny outgoing
But what are the consequences of doing this on amazon ec2?
I'm running possibly unsafe perl scripts on my instance and ...
4
votes
4answers
240 views
How to protect Ubuntu12.10 from Viruses, Spywares, Spamware and Intruders?
I have been using Windows OS for a long time and there i needed to install a separate Anti virus Program (included with firewall, anti spam) etc..
With my mentor's recommendation, I have replaced ...
3
votes
3answers
7k views
How do I turn off the firewall in Ubuntu 12.04? [closed]
How do I turn off the firewall in Ubuntu 12.04?
Thanks for the answers. The reason for turning it off was twofold: I often cannot make a wireless connectin to internet and get the server is unable to ...
3
votes
2answers
3k views
Why UFW has to be (re)started at boot time if it's only iptables rule manager?
README from source package says:
When installing ufw from source, you will also need to integrate it into your
boot process for the firewall to start when you restart your system. Depending
on your ...
3
votes
2answers
213 views
Is portfowarding to my localhost on my personal Ubuntu computer secure?
After installing Lamp on my personally Ubuntu computer, I am running a application that requires to connect to the web and send SMTP mail; for example paypal needs a www address to notify successful ...
3
votes
6answers
2k views
UFW firewall still blocking SMB despite adding rules
I have an Ubuntu PC with ufw firewall (GUI version). I have added the preset Samba service, in and out, and even tried adding the ports manually (135-139, 445, UDP and TCP, in and out), but it still ...
3
votes
3answers
2k views
See configured rules even when inactive
I'm wondering if it's possible to get UFW to list the configured firewall rules even when it's not enabled. I only have ssh access to the server at this time, and I don't want to enable UFW if there's ...
3
votes
1answer
644 views
Do I need to activate the firewall? I only use Ubuntu for a home desktop use?
I am a novice at Ubuntu (12.04). I have it on my netbook which I use mainly for surfing the net, learning python and remote desktop into my work computer.
Do I need to enable a Firewall type ...
3
votes
2answers
116 views
Hourly events in the firewall-log, originating from Ubuntu12.04-box. How to find the reason? [duplicate]
Possible Duplicate:
How do I disable Online Videos in the Unity Dash?
every hour, the logfile on our firewall (IPCop 1.4.20, 192.168.1.8) lists nine lines, apparently caused by my Computer ...
3
votes
1answer
337 views
How to prevent certain applications from accessing the internet?
I want to prevent certain applications from accessing the internet. When I was using windows XP I had an application (i think it was Zone alarm) which always notified me when an application tried to ...
3
votes
1answer
374 views
local development LAMP server: routing external requests through SOCKS proxy
I've got a (virtualized) local LAMP server on Xubuntu 12.04 that I am using for Drupal development. I'd like to learn how to use web 2.0 integration Drupal modules (eg. youtube, facebook, etc.) but I ...
3
votes
1answer
183 views
Set up a GUI managed firewall for other machines?
What ways are there of setting up a firewall that can be managed with a GUI that allows you to firewall (filter*) incoming traffic routed to other machines?
Can GUFW do it? FireStarter? (or should ...
3
votes
2answers
193 views
Error message when entering iptables command (table does not exist)
I have been trying to install Spotify, but when logging in I get a message saying I have an error 101. This appears to be related to either my proxy settings or to my firewall. Following instructions ...
3
votes
1answer
467 views
How to set up Wi-Fi Hotspot for sharing using 2 wired and 1 Wi-Fi network cards?
I have 3 network cards installed in my ubuntu 10.04 server and I want to configure Internet sharing and file sharing on eth1 for wired users and wlan0 for wireless users.
Static ip:
eth0: 192.168.1.1
...
3
votes
1answer
245 views
How can I block a range of IPv6 addresses?
Are there any IP blocking applications or firewalls that support IPv6?
The ones I know about (pgld, moblock (sunset?) , nfblock, iplist (looks old)) are only for IPv4.
2
votes
5answers
521 views
Blocking Remote Login
Last night, I was shutting down my server and I saw a message asking if I wanted to shut down a "pts/0" session. Odd, I thought. So I logged back in and did a finger and saw that there was someone ...
2
votes
1answer
8k views
Currently What is the best Firewall & Internet security for Linux Ubuntu?
Currently What is the best Firewall & Internet security for Linux Ubuntu?
Thanks for answers.
2
votes
2answers
179 views
firewall ufw is “enable and active” but gufw is off
question concerning the ufw firewall :
sudo ufw enable
returns
Firewall is active and enabled on system startup
sounds fine, but when i start gufw after reboot, it is still off
what does that ...
2
votes
2answers
616 views
How do I set up a linux proxy for my mac
As my title suggest, I would like to set up a proxy in linux. The client that I'm using is a mac osx lion. I think I understand the theory but I keep hitting roadblocks.
I started using set proxy ...
