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

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2
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1answer
2k views

How do I allow local subnets in ufw?

I recently got IPv6 connectivity at home and now I would like to allow connections to my home server via IPv6 from the LAN only. The trick is that the IPv6 address/prefix assigned to the server is ...
1
vote
1answer
187 views

Unable to connect through Java programs in Ubuntu

I am unable to connect to any host through Java programs, getting java.net.ConnectException: Connection refused. Does it have anything to do with Ubuntu firewall configurations or any other ...
0
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1answer
2k views

UFW 'default deny incoming' doesn't work

I have UFW enabled, 'default deny incoming' set and no any additional rules, but I still can access all ports from other PCs. I have to manually block each port. What can be wrong?
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0answers
103 views

Running wifi hotspot on 12.04 without stopping the ufw firewall?

I've been using 12.04 LTS for a while, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports: TCP 80, 443 for web-browsing ...
0
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0answers
65 views

Allow hotspot service to run on Precise without compromising the firewall?

Well, I've been using Ubuntu 12.04 LTS for a while now, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports: TCP 80, 443 ...
20
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3answers
773 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 ...
2
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2answers
3k views

What could be the cause for these strange UFW block entries in my syslog?

I've recently noticed a large number of recurring UFW blocks in my syslog. This surprised me as I have no UFW rules set: $ sudo ufw status verbose Status: active Logging: on (low) Default: deny ...
0
votes
1answer
700 views

How do I configure ufw to only allow outgoing/established connections for a IPv6 network?

How do I configure ufw to only allow outgoing/established connections for a IPv6 network? I am using an old computer with 12.04 installed to create an IPv6 router for my local network. I would like ...
1
vote
1answer
402 views

Setup firewall: ask user to allow new incoming/outgoing traffic?

I'm using Ubuntu 12.10 and as I know there is already a firewall on any ubuntu system. It's ufw and because I like fancy gui stuff I can use gufw, that's very nice. Now I would like to configure this ...
6
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3answers
1k 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 ...
0
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1answer
247 views

Forward [open] Ports 7777; 2106

Hi i am new to Ubuntu (12.10) x64 Trying to forward ports for gameserver on my pc (Lineage II) Ports are opened in UFW Ports are opened in my Router Even if i disable UFW others still cant login to ...
0
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4answers
111 views

Simply safe internet access

Is it necessary to configure a firewall like iptables or firestarter when the goal is only to surf safely? For me, there is no need to open any port (i.e. samba, etc.).
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1answer
4k views

How can set these iptables rules to run at startup

I usually run my iptables rules whenever I login. From the terminal I type ; sudo sh firewall.sh Setting up my sister's computer, I want to give her some basic firewall protection. She wont be ...
5
votes
2answers
696 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 ...
2
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0answers
431 views

How I can connect the syslog-ng with a mysql database?

Hi guys I want to use a syslog-ng server for logging data from the firewall and I get Data from the Firewall in the file /var/firewall.log but now I want that the logs go to a database. For this I ...
0
votes
1answer
761 views

How do I firewall my computer so that only traffic go through the VPN?

I have read "How to configure an Ubuntu server so that all traffic goes through a VPN?" and found it doesn't apply to my case. I am only interested in the client-side of the VPN connection as I am a ...
2
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2answers
718 views

All ports are closed until they are opened manually by the user? Is it true?

I am new to Linux and Ubuntu. I googled and read some articles stating that all ports are closed until they are opened manually by the user. Is it correct? And what do you mean by "listening on a ...
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vote
2answers
1k views

Firefox cannot find website servers, what is wrong?

Recently, I tried to access the internet using Firefox. I have a good wifi signal according to the toolbar at the top, but Firefox says "Firefox can't find the server atwww.example.com." I tried ...
1
vote
1answer
686 views

How to allow PPTP VPN access through APF firewall

I'm attempting to connect to a PPTP VPN. I have opened ports 47 and 1723 in the ingress rules. When APF is turned on, it fails. When APF is turned off, it works fine. I have turned on as many logging ...
0
votes
1answer
234 views

Want some advanced configuration with ufw

I've read the ubuntu developer docs regarding the ufw here, but couldn't find what I was looking for. It allows me to set rules for controlling in/out traffic based on source IP or port numbers, but ...
5
votes
4answers
366 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 ...
0
votes
2answers
424 views

Updating 10.10 to the latest version through a firewall [duplicate]

I've had Ubuntu 10.10 on my server since I bought it several years back. I've tried to upgrade in the past but I'm always thwarted by my company's firewall. I receive messages like these: W:Failed to ...
47
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8answers
3k 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 ?
1
vote
1answer
410 views

using proxy with online flash games

when I try to play this flash online game "tankionline.com" using our university proxy I get this error "Cannot establish connection (host: 62.152.57.11, ports: 4444,5190,5223,5222,5050)". In windows ...
0
votes
1answer
166 views

block outgoing internet calls from inside a container

This question is not similar to my earlier post. This is pretty simple I think, I just don't know enough about networking and the ubuntu firewall. I followed this article and setup a linux container ...
3
votes
2answers
4k 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 ...
2
votes
1answer
1k views

Why can't I allow access to port 22 on Ubuntu 12.10?

I can't seem to figure out why port 22 will never let me ssh into my laptop. Here's what I'm trying: ryan@gigantic-laptop:~$ sudo ufw status Status: active To Action ...
0
votes
2answers
239 views

How to stop firewall

I am new to Ubuntu. I am developer and working with maven3. I am unable to download dependencies from this site. When I tried in Windows it was a 404 exception but when I stopped my anti-virus it was ...
0
votes
1answer
2k views

What is the default ubuntu 12.10 firewall? [duplicate]

I have been trying to get ubuntu one to work (i.e. sync my files), but it keeps saying that it is "getting information" and "please wait". I only have 338MB used on my Ubuntu, so it shouldn't take ...
4
votes
1answer
241 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 ...
2
votes
2answers
1k 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 ...
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vote
0answers
88 views

Is there a firewall that blocks a process and shows a dialog with buttons Allow, Drop, Disable?

Currently I use ufw and Firestarter, and I'm just learning how to use a firewall. When I used windows there were a couple of firewalls that could block a process which tried to establish connection ...
1
vote
1answer
248 views

Migrate Debian firewall rule to Ubuntu

My old Debian firewall died and I'm migrating saved rules to Ubuntu this way: iptables-restore < firewall_config I get this error: Bad argument `192.168.1.0/255.255.255.0' Error occurred at ...
0
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0answers
961 views

Problems allowing outgoing multicast in ufw

I am having problems configuring the uncomplicated firewall (ufw) to allow outgoing multicast traffic. I am blocking all in and outgoing connections as the default policy. I have supplemented with the ...
2
votes
1answer
259 views

IRC service and UFW firewall rules

I am securing my computer and have created same rules by utilizing UFW at CLI. My question is this, in order to allow IRC services with XChat 2.8.8, and because IRC service uses ports 6667 through ...
8
votes
3answers
73k 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 ...
2
votes
1answer
729 views

Which port does Ubuntu Software Center use?

I have installed the gufw firewall utility and want to make a whitelist of ports (want maximum security, but whitelisting single IPs is currently too tedious). I have so far only entered ports 53 (for ...
1
vote
3answers
864 views

How to disable Internet connection for a single process?

I know the PID of a specific process and I want to disable the Internet access for this process and only for this process, so other process can access Internet. Is there any way to do it? I ...
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0answers
62 views

How to load firewall before network?

How can I ensure iptables gets up before any network adapter gets up? And can network be stopped to be brought up if there is an error in the firewall rules? For exiting and future network adapters. ...
1
vote
1answer
408 views

ubuntu server: can't access apache hosted pages after changing ip

I moved my server to a different office. Since they wanted to access it, I joined their network by changing my server's IP. The server hosts LAMP + postgres. Now I can't get the basic web apps to ...
2
votes
4answers
2k views

issues in installation of mongo DB

I was installing mongo DB on my Ubuntu-12.04 system, but while i give the following command in my terminal apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10 It gives me the following ...
0
votes
1answer
472 views

How to connect to a machine behind a firewall using VNC?

I am trying to connect to my computer in laboratory from home. I have installed Remmina on my laptop home and X11VNC server on the computer in the lab. When I have the laptop in the laboratory I can ...
3
votes
2answers
208 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 ...
1
vote
1answer
157 views

User to access only to specific IP addresses

How can I setup Ubuntu box so logged user can access only to several IP addresses, on all protocols? Additional problem is that Ubuntu uses proxy to acceess to internet. Tried with UFW, but did not ...
1
vote
0answers
512 views

How to change Port 27000 from filtered to open status

In my ubuntu box I am running flexlm licensing software on port 27000 and I am able to pull the license from the this port to run the simulation software locally. I am also trying to run the same ...
0
votes
1answer
1k views

Symfony2 - Apache vhost for app_dev different port

As I'm using url rewriting to access my Symfony2 application, it is directly available from http://my_application.my_domain.net Now I'd like to be able to access the dev environment simply using a ...
2
votes
1answer
397 views

How to pass traffic from static ip on my router through Ubuntu firewall to LAN ip

I have a router that has 5 static ip addresses set on it. These external static IP's are mapped to internal IP's on our LAN. We currently have no firewall or proxy set up, so I cannot monitor user ...
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0answers
140 views

ssh client times out to some servers, works on others

I have a strange problem and I'm not sure where to begin. My ssh client works on some servers but times out on others. Obviously, I checked that the servers are accessible via ssh from other ...
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0answers
2k views

UFW port forwarding

I use UFW and here is my setup: eth0 is configured as a bridge interface (br0): inet adr:10.0.4.10 Bcast:10.0.4.255 Mask:255.255.255.0 eth2 is connected to a private network: inet ...
2
votes
1answer
166 views

Failed network lookup

I'm running Kubuntu 12.10. I am having three networking problems that I think might actually have a common cause, even though they are in apparently unrelated areas. I had them in 12.04 also: When ...