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

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ubuntu 14.04 default firewall rules

I would like to know exactly which scripts are responsible for default iptables rules (no ufw, no gufw) in Ubuntu Server 14.04. After fresh installation even with ufw disabled (by default) there are ...
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10 views

Synergy works one way only?

I am running two Ubuntu 12.04 machines connected to the university network. One is a desktop and the other a X230t Lenovo laptop. They are both wired(eth0) to the same network. I am trying to get ...
0
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2answers
12 views

How do I with ufw deny all outgoing ports excepting the ones I need?

I did the following: ufw default deny outgoing, sudo ufw allow out 80 which I thought would let me use the Internet but didn't can y'all help? Also are there any other ports used by Ubuntu for which ...
2
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1answer
43 views

basic security tools and packages that should be installed on a public facing web server

I'm a newbie in this world and I do not have a lot of knowledge about how security works on Linux systems. I recently created a droplet on DigitalOcean with Ubuntu 13 and I've been setting it up by ...
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1answer
78 views

SSH tunneling over SSL

On one of my systems there is a firewall forbidding any outgoing unless http(s)... Some users have to ssh but they can't.I tried first to run ssh on port 443 but with no success. I googled it and ...
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6 views

Juju security model issues

What plans are there to extend the security model in Juju? We see two significant issues with the current model - no internal firewalling within an environment, and the inability to expose ports to ...
2
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1answer
36 views

ufw firewall disabled - How to turn it back on?

I am using Ubuntu 12.04 and just recently noticed, that my ufw-firewall is turned [off]. I know It's turned [off] by default, but when I set Ubuntu up, I turned [on] the firewall with: sudo ufw, but ...
0
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1answer
13 views

Ubuntu forward ports, default state, forwarding not working?

im running ubuntu 12.04.4 server. I been googling the nett for answers, but could not find any.. I would like accsess a few web-gui's on my server. I have forwarder the ports in my router, worked when ...
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1answer
382 views

ubuntu server 12.04 and ufw failure on startup, and several module not found errors

I have problem enabling ufw on startup, it works fine if I do: sudo ufw enable. But after restart puf, I've to redo it. I tried: sudo /lib/ufw/ufw-init stop ; sudo /lib/ufw/ufw-init start And ...
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2answers
36 views

Problem with ufw enable: libkmod: ERROR ../libkmod/libkmod.c

I am trying to enable ufw and this is the output: root@p:~# ufw enable Command may disrupt existing ssh connections. Proceed with operation (y|n)? y ERROR: problem running ufw-init libkmod: ERROR ...
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0answers
14 views

root kit/fire wall [closed]

unable to use terminal to set up firewall. jim-Com2 dbus[632]: [system] Successfully activated service 'org.freedesktop.RealtimeKit1' Apr 8 10:37:44 jim-Com2 rtkit-daemon[1608]: Successfully called ...
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1answer
63 views

Iptables and bind9 to forward to google's dns

Hello i have a very hard time on getting along with iptables and bind9 as my internal network dns server. It's configured to forward my queries to google's dns (8.8.8.8). The main problem is i can't ...
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1answer
120 views

UFW not blocking connections to docker instance

I have a webservice running inside a docker instance which was run using the following command: sudo docker run -d -p 4040:4040 .... My UFW rules look like this: ~ sudo ufw status Status: active ...
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0answers
965 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 ...
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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 ...
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0answers
25 views

Using Gufw create rule to reject traffic from specific subnet

I am connected to two networks one trusted, one not. Untrusted range is 172.18.0.0/16. (I need some connectivity with it, but not all ports open.) I would like to setup Gufw to reject connections on ...
2
votes
2answers
54 views

Why does DEFAULT INCOMING DENY not stop Firefox from working?

If UFW is actually not an application layer firewall but a "interface to iptables", how can it be if I have by DEFAULT INCOMING DENY and OUTGOING ALLOW setting that ANY internet application is ...
5
votes
2answers
700 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 ...
6
votes
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 ...
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0answers
25 views

Need help to make this file work in iptables

I came across the following example of how to use iptables to block internet access when the VPN connection is terminated abruptly: iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ...
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0answers
48 views

Setting up a firewall Ubuntu Server 13.10 to specified domain users of a Windows server 2008

So, here's the plan: I want to set up a firewall that allows/blocks certain websites for specified users in a Windows server domain (local); For example: For the user domain.name/user1 I want to ...
3
votes
3answers
64 views

apt-get does not work without an internet connection. How can work around this?

I have a host which is firewalled to the point where apt-get is unable to download packages. That host does not have access to a proxy. I know in gentoo I could work around the problem by fetching ...
1
vote
1answer
35 views

Server unexpectedly closed

So I know that similar veins to this topic have been posted, but mine specifically deals with the fact that my SSH login through Putty worked from my desktop and my laptop. However, after carrying ...
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0answers
29 views

How To Stop and Restart Firestarter Events / Logging

I need a simple workaround to be able to stop and maybe restart only when needed logging events in Firestarter. I managed to enable logging in Ubuntu for Firestarter using this solution, and all is ok ...
2
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0answers
73 views

UFW is DENY/DENY, but PACKETS are still getting out of my ethernet device. Why is this?

Hello, I have a question. I would like to use the UFW Ubuntu Firewall to lock both Input and Output completely from the server to ensure no packets are sent initially as a baseline. I enabled UFW, ...
2
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0answers
115 views

found someone lurking in my LAN, not sure what to do next

I have DD WRT router with internal numbers all falling within 192.168.1.0/24. I was looking on my firewall records this morning and found someone at 10.10.109.100 got blocked from accessing port 5353 ...
0
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1answer
31 views

enable port 9696 on ubuntu server

I am using ubuntu server lts 12.04 on vmware virtual machine. I need to enable port 9696 which is blocked or filtered. When i use the nc -v -w 1 localhost -z 9696 command it shows me the following ...
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3answers
54 views

using nmap for information regarding web host

am trying to get info of host run in linux about open/closed port the host is attacked randomly by hackers changing the content of the page.deleting files,homepage content changed. how can it be ...
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0answers
45 views

Port won't open!

I have a server that want to allow connections into it through port 25565, but when I test on http://www.yougetsignal.com/tools/open-ports/ it says they are closed? I have no outfacing interface ...
0
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0answers
50 views

Analyze firewall logs to track intrusion

I have just started this topic where the firewall on my router detects intrusions e.g. Mar 11 14:15:11 kernel warning kernel: [fwlog] Intrusion -> SRC=85.102.133.241 DST=109.78.126.234 ...
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48 views

how to set up iptables for dyndns server?

I have a server running with a dhcp public IP and ddclient updating my hostname from my public IP whenever it changes. My ISP has a feature for dyndns, so my router should automatically map my public ...
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2answers
60 views

Where did I fail with my basic iptables setup?

I installed iptables on a VPS (Virtual Private Server from openVZ) - Linux 2.6.32-24-pve #1 SMP Fri Sep 13 07:29:30 CEST 2013 i686 GNU/Linux. I also installed: apt-get install iptables-persistent ...
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2answers
1k views

Why can't I connect to SSH server from Ubuntu client? (while windows client is okay)

I have configured an ssh server on a Ubuntu 12.04 LTS machine. I changed the listening port to the one different from the default port 22 (that's the only change I made on the server). I am trying to ...
0
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0answers
44 views

Iptables help with server on 12.04?

I am trying to create a Minecraft server with port 25565 for me and my friends to access. I used to run one on my mac, where I would change the config for my firewall to allow connections through ...
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0answers
102 views

How to log firewall logs to a remote Syslog server

After much reading and unsucessful attempts, I do not manage to send some of my firewall logs to a remote server. Here is my setup: The remote server is a synology NAS, on which the syslog server ...
6
votes
1answer
298 views

Why are certain things able to get through ufw firewall?

I should say up-front that I am TOTALLY new to Linux, Ubuntu, and the technical side of networking. I am setting up Ubuntu on a server computer and have learned a bit about configuring the ufw ...
0
votes
1answer
51 views

UFW locks me out of server everytime I run it

Background: I'm setting up a new 12.04 instance on a VPS with a new provider.The VPS provider only offers a 32bit image but that really shouldn't matter here. I have no local access to the machine and ...
0
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1answer
49 views

Setting up Ubuntu server with firewall - do I need 2 NICs?

Assume a LAN where 4 port ADSL Router, Server and PCs all connect to a network switch. Apart from working with the server, the workstations must have restricted access on what sites they can use. For ...
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71 views

Routing 192.168.168.0/24 out eth0, all else out wlan0

Good Morning/Afternoon/Evening, I have been tasked with the configuration of multiple, sonicwall ISR's, and thought i could use this as a bit of a Linux learning curve. What i am attempting to do, ...
2
votes
1answer
71 views

Can't Get UFW Firewall to Allow Anything

I'm trying to set UFW (using GUFW) to create a firewall that only allows network connections when OpenVPN is connected. So in GUFW I deny incoming and outgoing connections and enable the Firewall. I ...
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 ...
20
votes
3answers
777 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 ...
1
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0answers
35 views

Cannot connect to work VPN

I'm using Ubuntu Studio 13.04 Saucy, and generally new to Ubuntu. I work for a company which provides Windows based pptp VPN access for working remotely. Soon after I installed Ubuntu Studio, I was ...
0
votes
1answer
38 views

Samba problem — is it a firewall issue?

I have just installed Ubuntu 13.10 on a computer I use as archive for other machines. I need Samba working from various Windows 7 machines. I have confirmed that smbd and nmbd are both working, and ...
1
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0answers
107 views

UFW, IPv6, and HTTPS

I'm running Kubuntu 13.10. I recently enabled IPv6, and setup UFW to support it. Everything seems to be working as expected, except I've noticed certain traffic being blocked with an AUDIT-INVALID ...
0
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1answer
34 views

Setting up a basic firewall for 1st time user

Could anyone tell me some basic commands to set up my firewall. I already have ufw. What commands should I use for a basic security?
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 ...
0
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0answers
109 views

Configure iptables for L2TP/IPSec VPN

I've been trying to get my server running a VPN so that I can connect to blocked sites in China while I'm traveling, but am having a few problems with iptables. My connection works fine if I flush my ...
0
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1answer
25 views

why Ubuntu Firewall not showing verbose?

Even Ubuntu Firewall in running mode , I am not getting the data. may I know why ? root@ubuntu:~# sudo ufw status numbered Status: inactive root@ubuntu:~# service ufw start start: Job is already ...
1
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1answer
26 views

Firewall Activation Process

How do I activate my firewall through the terminal and is it Necessary or done automatic. My regards team! thmoabw