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

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5
votes
1answer
229 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
8k 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
244 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
1k 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
2answers
3k 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 ...
30
votes
9answers
19k 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
296 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
448 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 ...
2
votes
2answers
467 views

Updating UFW (uncomplicated Firewall) doesn't affect existing connections

Can anyone tell me whether or not new or updated rules made to ubuntu (v10.10) UFW should affect existing connections? I have noticed that these only take effect the next time I try to reconnect, ...
6
votes
6answers
6k 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 ...
14
votes
5answers
10k 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 ...
2
votes
2answers
8k views

How can I use smbclient to connect to Windows shares by hostname when a firewall is enabled?

I can't connect to file shares on Windows computers using smbclient -L //hostname when the firewall is enabled. This occurs whether I'm using ufw (which allows outgoing traffic and replies back in ...
2
votes
7answers
3k views

How do I open up firewall while keeping it safe?

Since I've installed Firestarter I have encountered connectivity issues that are all resolved by disabling the firewall. I'd prefer to have the firewall running and allow all the traffic I normally ...
5
votes
3answers
8k 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 ...
12
votes
8answers
3k views

Is a Firewall really necessary these days? [closed]

should I install something like gufw?
39
votes
4answers
15k 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.
22
votes
3answers
14k views

How to block internet access for wine applications?

How can one prevent specific or any wine applications from accessing the internet? When using certain applications under Windows, they were trying to access the internet from time to time without ...
1
vote
2answers
541 views

Firestarter and DHCP Failing via Wireless [closed]

I recently installed Firestarter to implement a firewall for my server - an Ubuntu 10.04 installation. Now, when ever a wireless connection attempts to connect and get an IP address via DHCP, it fails ...
2
votes
5answers
861 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 ...
12
votes
4answers
18k views

How can I block ping requests with IPTables?

and stealth specific ports?
2
votes
2answers
3k views

Autostart Firestarter GUI on Boot?

Since Firestarter GUI needs Admin rights to start, does it make sense to autostart firestarter on boot and how can i do it?
5
votes
2answers
1k 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 ...
2
votes
3answers
273 views

Can I install a firewall interface without `menu`?

I need an interface for ufw (uncomplicated firewall) that does not depend on "menu", which is outdated and messing with software updates/installations. I don't mind building from source but prefer a ...
18
votes
5answers
6k 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 ...
4
votes
3answers
3k 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 ...
5
votes
2answers
2k 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 ...
1
vote
1answer
6k views

How to open ports for outside traffic? [closed]

I recently installed Ubuntu Server on an old machine, to set up a website with family photos etc. It is connected to the Internet via my home router (WRT160Nv2). I set the connection up with a static ...
6
votes
3answers
1k 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 ...
10
votes
3answers
8k views

How can I open a range of ports in ubuntu using (g)ufw for use with membase?

I have membase (membase.org) installed and I have to open a bunch of ports in order for the cluster to function Adding the single ports was easy enough but I can't work out how to open the range ...
2
votes
3answers
489 views

Is it possible to configure Ubuntu as a software firewall?

I have some systems running on Ubuntu in the private IP range 192.168.2.0-255 . These systems are connected to a switch and the switch is connected to the ISP's modem. Neither the switch nor the ...
8
votes
3answers
28k 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 ...
3
votes
5answers
2k views

Cannot ssh/ping an Ubuntu machine over WiFi

I have an Ubuntu 10.04 running on a laptop, connected to a local network via WiFi. This machine does not respond to pings/ssh connect requests, as if it was firewalled. However, if I ssh from this ...
1
vote
1answer
900 views

Ubuntu Linux UFW Firewall, Local Intranet Access

At home, I have Ubuntu server with the UFW firewall. What command do I type to turn on local intranet access to my web server, but keep the outside world out from my DSL modem?
0
votes
1answer
693 views

Ufw causing trouble with DHCP or WPA? [closed]

It appears that enabling UFW is causing my network connection to drop periodically on a WPA-Enterprise network, according to the network-manager GUI app (and the lack of a server response to web ...
0
votes
2answers
643 views

Trouble with UFW blocking stuff from NAT machine to inside of NAT

I've got a NAT box (Ubu 10.04) running ufw with the following sudo ufw status verbose: Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip To ...
8
votes
2answers
7k 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 ...
12
votes
3answers
58k 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 ...