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

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-3
votes
4answers
6k views

What ports should I open for listen and/or transmit in my firewall to keep internet ok? [closed]

What are the minimum ports and services that should I allow/open for listen and/or transmit in my firewall (I am using Firestarter) to keep my internet running ok? Some talk about what services, ...
1
vote
0answers
2k views

UFW Settings - Application Integration [closed]

I have installed the Ubuntu system, and deny both incoming and outgoing ports loosing internet access. Now I want access only for my Firefox that I have installed separately from the Firefox website ...
5
votes
1answer
14k views

What are ICMP redirects and should they be blocked?

After enabling ufw and the Tiger security auditor, I see warnings saying: The system accepts ICMP redirection messages What are ICMP redirection messages? Should they be disabled for security ...
2
votes
2answers
3k views

iptables mac address filtering not work

I block every port default by ufw and add iptables rules like this: sudo iptables -A INPUT -p tcp --dport 1723 -m mac --mac-source 00:11:22:33:44:55 -j ACCEPT then I list iptables INPUT rules: ...
6
votes
2answers
4k 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
0
votes
2answers
1k views

How to make an internet server as firewall using ubuntu 11.10

i have one static broadband connection which is coming to my Ubuntu server with 2 lan cards, there are 10 more PC's to which i need to provide internet connection through Ubuntu server as well as i ...
0
votes
1answer
326 views

How to update firewall to pass NFS traffic?

I have set up the NFS Service using these instructions and it was working fine last week but today I get this error: Root-NFS: Unable to get nfsd port number from server, using default I ...
1
vote
1answer
512 views

How do I check the status of apf firewall?

How to check whether apf (Advanced Policy Firewall) is running after the reboot? It doesn’t have any status, so how can we know?
1
vote
1answer
332 views

Interactive Firewall

I have Ubuntu Server 10.04 serving as router/firewall with iptables. Also have number of client computers in LAN. So far so good. Now what I need is some sort of interactive firewall software on ...
0
votes
1answer
856 views

Cannot ping between computers, but I can connect (only one way though)

I am new using Linux, so I would really appreciate a simple as possible answer. I cannot ping between two computers, neither to nor from. I can ssh from one computer to another, but not the other way ...
0
votes
2answers
596 views

Firewall configuration and consequences

I'm using Ubuntu 11.10. And I want to know something about firewall in Ubuntu, because I want to know if it could be the reason why my application doesn't work properly. Little background: I'have ...
0
votes
2answers
6k views

Why isn't Transmission working?

I'm using the latest version of Ubuntu and Transmission. According to Transmission, the file I am downloading has 0 peers and is idle, even though there are a few peers seeding it. Here's a batch ...
2
votes
0answers
556 views

UFW give errors and won't auto start at boot [closed]

I just tried to enable ufw on my server, it gave me this error : ERROR: problem running ufw-init When I tried the second time, it worked. When I tried to set the default rule "sudo ufw default ...
1
vote
0answers
70 views

Should I be using a firewall in Ubuntu? [duplicate]

Possible Duplicate: Why is the firewall disabled by default? I installed both gufw and Firestarter but I'm hesitant to activate one of them because I don't know too much about firewalls in ...
1
vote
2answers
1k views

How Can I Use Ubuntu As Firewall Server

Can Ubuntu be configured as a firewall server , if yes how ? , if no why ?
6
votes
1answer
306 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 ...
0
votes
1answer
655 views

Blocked port 5000?

I am trying to use my Ubuntu laptop with a Heroku hosting (it's a kind of VPS hosting). Their support says my port 5000 is blocked. Any way I can check it? Does it make any sense? Is it my pc, or my ...
1
vote
1answer
847 views

Remote access my desktop through router

How can I remote access my computer desktop that is behind a router with my Android Tablet?
0
votes
0answers
330 views

does ubuntu 10 04 lts have a built in firewall and antivirus [duplicate]

Possible Duplicate: Is there a preinstalled or automatic firewall? Do I need to have 'antivirus software' installed? I have just installed ubuntu 10 04 lts on my laptop and I am ...
1
vote
1answer
1k views

How can I set up GUFW so that only firefox connects to the internet

I only want http, https and DNS to be open. I'm having troubles with setting up port ranges in the UFW GUI. How do I input configs into the feilds? Basically, something along the lines of this, but ...
2
votes
0answers
597 views

Is there an application firewall for Linux, like ZoneAlarm [duplicate]

Possible Duplicate: How to control internet access for each program? I've tried Firestarter and Ufw, but in the end, decided to write my own iptables scripts. I basically let http and ...
2
votes
1answer
337 views

Shorewall is breaking packets/sessions when connecting out to internet

I am happy to forward any further data if required like firewall rules etc. Would appreciate if someone can skim through my config and see if there are any glaring errors. Problem: Everything working ...
3
votes
2answers
936 views

Is there any software for bypassing the firewall?

I am using ubuntu 10.04. Is there any software to bypass the firewall configured by my network administrator. I have seen my friend using software named ultrasurf in windows which bypasses the ...
2
votes
3answers
3k views

What Firewall, anti DDOS and anti Brute-Force managers exist in Ubuntu

I have heard of ufw and of course using iptables but is there any other firewall or port manager for incoming/outgoing connections. I am also looking for GUI based ones apart from terminal ones and a ...
5
votes
2answers
274 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 ...
7
votes
4answers
12k 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 ...
1
vote
1answer
747 views

How to run any program but prevent it from accessing the Internet

I see a nice tutorial on the subject from 2009: http://ubuntuforums.org/showthread.php?t=1188099 But wanted something that will (more likely) work on Ubuntu 11.10. This is a flavor of an ...
2
votes
1answer
1k views

No client internet access when setting up these iptables rules

I have read many other posts but cannot figure this out. eth0 is my external connected to a Comcast modem. The server has internet access with no issues. eth1 is internal and running DHCP for the ...
0
votes
0answers
126 views

novice user…firewall [duplicate]

Possible Duplicate: Why is the firewall disabled by default? I've recently ditched windows 7 for Ubuntu 11.10 64bit... I'm a total novice and was wondering do I need to make any changes to ...
8
votes
3answers
33k views

How do I see which ports are open? [duplicate]

I am running a web server on a machine with Ubuntu 11. Everything is accessible from the local network, but not from outside. What can I do to check to make sure the appropriate ports are open? I am ...
2
votes
1answer
1k views

Configure firewall (Shorewall/UFW) to allow traffic for services on an Ubuntu Server

I have an Ubuntu Server 11.04 x64 which I want to secure. The server will be open to Internet and I want to be able to SSH/SFTP into the machine and the SSH-server runs on a custom set port. I also ...
7
votes
2answers
8k 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).
1
vote
0answers
614 views

firestarter firewall will not start [closed]

After I installed firestarter on 11.10 and started it, it gave me some basic choices to configure the firewall. So I chose eth0 and no DHCP and then started the program. But it showed an error and ...
7
votes
3answers
13k 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 ...
1
vote
3answers
1k views

Block anything from certain IP, injected from ISP when tethering from phone

My ISP injects JavaScript files - most notabily bmi.js - and certain other unwanted additions to web requests when tethering from my phone. It would be OK if the JavaScript was useful, but it is ...
2
votes
1answer
266 views

Enforce outgoing port for a machine inside LAN

I'm running Ubuntu Server (natty) in as a gateway/firewall in front of a private network. I have successfully enabled IP forwarding and NAT so the machines behind the firewall can connect to Internet ...
1
vote
2answers
2k views

How do I fix UPnP Port Forwarding on Ubuntu using miniupnp?

From what I understand, Transmission bittorrent client uses the miniupnp library to do it's UPnP port forwarding of routers, however on Ubuntu upnpc (a test client of the miniupnp library) doesn't ...
3
votes
1answer
287 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.
9
votes
1answer
733 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 ...
1
vote
4answers
1k views

Ubuntu One does not sync: firewall settings?

I'm new to Linux. I installed Ubuntu 11.04 on a partition and I love it, but Ubuntu One does not work. I created a free account and a directory Ubuntu One appeared automatically, as expected. I copied ...
7
votes
1answer
497 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 ...
5
votes
1answer
215 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 ...
5
votes
2answers
7k 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 ...
3
votes
1answer
216 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 ...
8
votes
3answers
868 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 ...
6
votes
2answers
2k views

How to restrict user's access to the internet for time intervals?

I want that one of the users (not in the sudoers list) have Internet access from 14:00 until 16:00 and from 17:00 until 18:30. Is it possible? Can I set different time intervals for different week ...
16
votes
9answers
12k 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 ...
1
vote
2answers
273 views

How do I interfere with domain access?

I've just installed Self Control for Ubuntu. It looks like it just tweaks /etc/hosts and defines some rules in iptables. Some sites aren't getting blocked, and I think it's because they're ...
1
vote
2answers
293 views

How to debug why server is blocking outsite requests

I install ufw, gufw & firestarter yesterday, but uninstalled them all today. Now, I find that I cannot access the server from outsite. When I could before. How can I debug whats blocking these?
0
votes
1answer
2k views

How to configure Firewall

How can I configure firewall for what I use as a web development server. I should be blocking all ports except 80 (HTTP), FTP, SSH? I tried configuring using ufw, gufw, firestarter but I ended up ...