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

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2
votes
2answers
675 views

List firewalls on the local machine

In Windows besides the Windows firewall a user could have installed a firewall program, or there is another service listening to that port. In Ubuntu how can I see what blocks/filters open ports? ...
2
votes
1answer
3k views

Firewall settings for Dropbox LAN sync

I have two Ubuntu 12.04 computers on a wireless home network, kept in sync using Dropbox. I use Dropbox rather than Ubuntu One because of its LAN sync feature - preferable to doing everything via the ...
0
votes
2answers
276 views

How do I get my VPN to work even when my firewall is active?

I have subscribed to a VPN service, but it seems that it does not work whenever my firewall is active. I have up until now used Firestarter to configure my firewall, but it has no options for ...
2
votes
1answer
4k views

What GUI firewall manager should I use to replace Firestarter?

Apparently Firestarter is no longer maintained, and it does not have any options in its interface for handling the connection to a VPN. Right now, my VPN does not work if my Firewall is activated. I ...
0
votes
1answer
3k views

Port listening on localhost:8000 but not on ip:8000

Hello I'm running a web application on port 8000. When I access it from the host server localhost:8000 it responds ok, 127.0.0.1:8000 also works, but 192.168.1.7:8000 does not work. 192.168.1.7 is the ...
-1
votes
1answer
1k views

Firewall settings for VLC (streaming)

I'm watching online TV with VLC and http://mafreebox.freebox.fr/freeboxtv/playlist.m3u. Does anybody know which ports and protocol must be enabled in my firewall settings? I've been searching on the ...
3
votes
1answer
1k 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 ...
1
vote
1answer
474 views

Firestarter preventing Firefox accessing internet

I have recently had an issue with Firestarter preventing Firefox accessing the Internet. I have used Firestarter in the past with Hardy Heron and recently switched to Precise Pangolin. The policy ...
3
votes
1answer
2k 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 ...
2
votes
1answer
464 views

Linux Firewall NAT Port Forwarding Issues

At my home I have a Linux server (it's only job is NAT, DHCP, and DNS) with Ubuntu 10.10 Server 64-bit. I have webmin installed on the server too, but I do know my way around a command line quite ...
1
vote
1answer
430 views

How do I set up user level restrictions on a gateway?

I am aware that Ubuntu Server can be used as a gateway to allow Internet connection to a LAN. Then we use IP tables or other firewall settings to restrict (for example), certain websites from being ...
1
vote
2answers
3k views

How do I find my firewall is blocking mysql?

I'm very new to Ubuntu. I couldn't able to connect to mysql via my programming language. I know all my property file in my code is correct. But still I couldn't able to connect to mysql. I guess my ...
0
votes
1answer
616 views

Firestarter exits after closing

I'm using Firestarter on Ubuntu 12.04. I configured Firestarter to run even after closing in the preferences menu. But still it exits after closing. It doesn't minimize to system tray.
2
votes
1answer
342 views

How can I prevent applications sending data over the net without my consent?

Recently I had a couple of instances of programs sending data (copies of some of my config files) out over the net. I consider this very bad form on behalf of the writers, and I want to prevent it ...
1
vote
2answers
600 views

Need a Firewall application similar to one that ships with Fedora

I've used Ubuntu since more than a year now, as the Oneiric Ocelot has more than exceeded my expectations and provides most things out of the box. However, there is one feature that both Windows and ...
0
votes
3answers
87 views

APT downloading without my consent

I installed natty (11.04) and wanted to play a video. Went through the process the cancelled because it was slow and files were relatively large unstable and it was late .(Internet very expensive for ...
2
votes
1answer
616 views

How do I block a protocol using iptables firewall

How to block a specific protocol using iptables firewall? For example block Yahoo messenger?
1
vote
1answer
18k views

Port seems to be open, but connection refused

I am trying to open port 3000 on Ubuntu 12.04, cause I have a web server listening there. I'm a bit out of my confort zone here, and spent many hours trying to solve the problem without success. Port ...
4
votes
2answers
648 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 ...
1
vote
1answer
2k views

Installed Xubuntu desktop on Ubuntu 12.04 server and now can't connect via SSH

I have a ubuntu 12.04 server that I could connect to fine using ssh over the internet. I installed the xubuntu desktop on it, didn't change any settings, then suddenly ssh stopped working. I can ...
0
votes
1answer
563 views

Ubuntu Windows Installer - Firewall

I installed Ubuntu with the Windows installer to use it along side. I could not find anything to activate a firewall so I thought its inbuilt and running. However now I read that I have to activate it ...
3
votes
2answers
8k views

How to configure UFW to allow IP Forwarding?

I have UFW, OpenVPN and Virtualbox installed on my home server. I have a host-only network for my virtual machine guests (vboxnet0) set up with the IP range 10.0.1.0, and another IP range of 10.0.0.0 ...
2
votes
0answers
250 views

Why is SSH not accessible after installing KDE on Ubuntu Server?

I installed KDE onto my Ubuntu server, which is operating as a file server. It installed a firewall that wasn't there previously. I can't reach any of the services I had operating on the box now, ...
6
votes
1answer
8k views

MySQL server not accessible from remote machine

I have installed MySQL server in my local Ubuntu server (11.10). I can't connect to the server from a remote machine. When I tried:- nmap localhost , It shows the following PORT STATE SERVICE ...
-1
votes
1answer
933 views

Setting up port forwarding on my router to Ubuntu machine [closed]

I just loaded up a older computer of mine to run a server for a game I'm working on, (it's a template server) and I need to forward ports 3200 and 3201, so that it can be accessed both on my local ...
3
votes
1answer
21k views

Currently what is the best Firewall & Internet security for Ubuntu? [closed]

Currently what is the best Firewall & Internet security for Ubuntu?
0
votes
1answer
108 views

New User to Linux in general (Setting up a hardware firewall, needs interface config and ufw config help!)

I'm very new to this new environment (coming from Windows) and I need some help setting up a hardware firewall and web server combo. I already have my website set up and I would like some guidance on ...
2
votes
2answers
12k views

How do I allow all possible IPs for Gmail servers through my ufw firewall?

I am currently using the following rule: ufw allow out from my_local_ip to any port 587 This is a little too lax for my liking. I would like to tighten it up and restrict it to only gmail's smtp ...
7
votes
2answers
4k 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 ...
2
votes
2answers
1k 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 ...
3
votes
1answer
527 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 ...
0
votes
2answers
1k views

iptables problem

Hi guys i have the follwoing iptables file for my ubuntu 12.04 server. ITs a bit messy because i tried different ways to fix it but the problem is it doesnt allow apt commands such as apt-get to run. ...
1
vote
1answer
225 views

How do I use “ld_preload” to control what apps can and cannot connect to internet?

I'm trying out Ubuntu. Been a Mac user. I like ubuntu a lot but I find it unnerving to not have any control over what apps can & cannot connect to the internet. I was advised that "ld_preload" can ...
14
votes
8answers
6k 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 ...
0
votes
3answers
2k views

Is the firewall active or not?

I'm confused about the status of my firewall. Using the Ubuntu Software Center, I have installed Gufw. Problem: When the Firewall is locked, it looks like it's inactive. But when I unlock it, it's ...
1
vote
1answer
96 views

How to add a rule for loggin packets in ufw

I'm seeing a lot of connections with source 0.0.0.0 and destination 0.0.0.0 in conntrack. I want to log these packets which have source 0.0.0.0 and destination 0.0.0.0 so that I can digg this issue ...
3
votes
1answer
2k 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 ...
1
vote
1answer
1k views

How to set fail2ban with apf?

I just installed fail2ban and the apf firewall. Those 2 seems to be not working together. Fail2ban have added some ipatble rules but they are not working. When I issue "/etc/init.d/iptables status" ...
1
vote
1answer
748 views

Different responses when telnetting into mysql's port via hostname

I'm trying to connect to mysql server installed on my computer. When I enter "telnet localhost 3306", I get some garbage characters meaning that I'm connected to the server. But when I enter "telnet ...
-3
votes
4answers
7k 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 ...
6
votes
1answer
18k 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
4k 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
331 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
614 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
361 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
914 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
630 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 ...