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

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-1
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0answers
8 views

curl blocked at TMG firewall

I'm using TMG (Threat Management Gateway) firewall at my web server. When I try to use Curl from outside, the firewall blocked the connection. What rule/setting do I need to create at TMG to allow it. ...
9
votes
3answers
17k 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 ...
0
votes
1answer
32 views

I have some questions about Firewall [closed]

So I am pretty new to Linux (With the exception of Android), and being use to the old ways of Windows pretty much all I had to do for Firewall was turn it on and forget about it. However with Ubuntu ...
0
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0answers
12 views

Processes in docker cannot connect with ufw enabled

I'm trying to setup a server to use ufw with docker (via dokku.) When ufw is enabled, I cannot open connections from one container to another. When it's disabled, I can connect fine. As an example, I ...
0
votes
0answers
13 views

Has Ubuntu some firewall activated by default?

Because I can't seem to connect to my ip-cam. And mnap produces alternating results if I use the cams IP address: Nmap scan report for 192.0.0.64 Host is up (0.00079s latency). Not shown: 991 closed ...
6
votes
6answers
1k views

Do I need a firewall for my desktop?

I don't have a router, but I mostly use my desktop for online shopping and torrenting. So, do I have to enable the firewall? I hope not, because I'm really dumb and I don't think I will be able to ...
1
vote
1answer
40 views

How can I tease Sonicwall?

In my college, I can't use the web, because they use Sonicwall network firewalls How can I tease it? For I use all websites in my college? Please see the result when I access a website blocked ...
1
vote
2answers
4k views

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 ...
0
votes
1answer
31 views

Setting up an Ubuntu Server 14.04 Firewall. Can it Protect multiple pc's on a local network?

I am new to Ubuntu firewalls. I would like to setup an Ubuntu Firewall on computer #1 it can be connected wirelessly or by Ethernet. I have another ubuntu server running on computer #2 and windows 7 ...
1
vote
0answers
15 views

Can't Connect to Apache2 Server From External Device (in LAN) Nor From External IP?

I forwarded ports 80 and 443 for my apache 2 server. However, if I: try connecting to the server via external IP or try connecting to the server from a local device via my local ip, I cannot gain ...
2
votes
3answers
130 views

14.04 missing “/etc/init.d/ufw”? my firewall never auto starts

I need to know how to fix the missing "/etc/init.d/ufw" file, is it some package or some command? I used the gufw to enable it, but on reboot my firewall was still off... I created a symlink ...
0
votes
1answer
33 views

what could be blocking port 5060 on my ubuntu 14.04?

I have a ubuntu 14.10, and am trying to telnet into it via port 5060 but I keep failing. I always get the message "Connection closed by foreign host". I checked my iptable, it is default policy to ...
0
votes
0answers
43 views

Port 80 apparently closed ubuntu 14.04

I'm installing a small server on the company where I work. I go to whatsmyip.org and it tells me it is 190.124.165.35. When I go to canyouseeme.org it tells me that the connection timed out for port ...
-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, ...
0
votes
0answers
32 views

captive portal and squid3 transparent mode

http://aryo.info/labs/captive-portal-using-php-and-iptables.html I did at practice. but squid (transparent mode should be) entered in the access.log s pages can not see. I use the following iptables ...
0
votes
1answer
130 views

Skype has stopped working on Ubuntu Studio 14.04.1

This is what Skype displays when I try to connect. I've tried reinstalling, but still no fix. When I sign in on my mobile phone it works, so I know it's an issue affecting only the desktop version.
0
votes
0answers
17 views

ipset with iptables-persistent

iptables-persistent was not reloading my rules at restart, and I realized the problem was that /etc/iptables/rules.v4 contained a --match-set referring to a set of rules created by ipset - which had ...
1
vote
2answers
24 views

The program 'iptables' is currently not installed

I am a newbie, so my apologies up front. I am trying to get DansGuardian installed (which I believe I have) and working. To get it working I need to filter IP traffic through the app via iptables. ...
14
votes
6answers
4k views

Does spyware exist for ubuntu?

Someone I know said he had put spyware on my computer. Is he talking crap? I've been using Ubuntu 12.04 for nearly 3 years now and I've never seen any type of spyware, remote keyloggers or RATS ...
2
votes
0answers
43 views

Refused connection of ssh

I installed openssh on my new Ubuntu14.04 server, turned on ssh, and enjoyed it after I finished installation. Every thing was fine; however, after just one night, I was blocked when using putty as ...
0
votes
0answers
24 views

Ethernet connection blocks some traffic while wifi works flawlessly

I'm not sure whether it's related, but I recently tried to reroute inbound traffic from a user-accessible port to port 80 following these instructions: http://serverfault.com/a/112798 Now, I can't ...
1
vote
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
2answers
54 views

find mac address of all connected systems [duplicate]

How can I find out how many system are connected to the local network and how can I get all IP and mac address of these systems. Is their any command/package to show the IP details? Can I use this ...
1
vote
0answers
28 views

how to block all tcp and udp and other protocol and only allow layer 2 communication?

sudo ufw disable sudo ufw default deny sudo ufw allow XXXX sudo ufw enable Does sudo ufw disable block layer 2 by default? How to block all TCP, UDP and other protocols, so only layer 2 ...
0
votes
2answers
1k views

Open source stun turn server which can do hole punch is there similar packages?

Is there any open source stun/turn server which can do hole punch like numb for Ubuntu ? Numb is a STUN/TURN server. Description A STUN/TURN server is used for NAT traversal in VoIP. ...
0
votes
0answers
12 views

Allowing web site through shorewall firewall

I'm fairly new to Linux and I've been following some guides to get a web server up and running. So far all is well with the web server and accessing it from the net. I've installed Shorewall firewall ...
18
votes
9answers
14k 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 ...
0
votes
1answer
35 views

Differences between UFW and GUFW

From what I have been able to piece together, the firewall that comes with Ubuntu is iptables, which is very complicated, so an easier way to access the firewall is through UFW and GUFW. UFW is ...
1
vote
2answers
88 views

How do you view all of the banned IP's for Ubuntu 12.04 via the command line?

I can't seem to find a quick command to just view all the banned IP's on the server. Or is there a file I can just edit? I'm guessing fail2ban is the one that inputs all the IP's to ban. Where do I ...
1
vote
1answer
109 views

What are the IP addresses in my iptables chain FORWARD settings in a Dokku/docker setup?

I've been playing around with Dokku on DigitalOcean (following this guide) and I'm trying to understand current firewall settings. So here's my setup: Ubuntu 14.04 Dokku Docker (as part of Dokku) ...
1
vote
0answers
58 views

Why aren't these ufw rules working?

I'm trying to configure ufw to only allow connections to 3 ip addresses on my local network, and deny everything else. Here's the commands I'm using: yes | sudo ufw reset sudo ufw default deny sudo ...
1
vote
2answers
739 views

how do you create an app profile for ufw?

Ufw has a command that lists out profiles to which you can further explore their profile definitions $ ufw app list And $ ufw app PROFILE {app profile title} I was wondering how you can ...
0
votes
0answers
21 views

Can't find Printer in the Printing program Officejet 6500

I have the following problem: I can't find my HP Officejet 6500 Pro to connect it with my Ubuntu 12.04 laptop. Before it worked perfectly, but since I use an extra router I cant connect to my printer ...
0
votes
0answers
20 views

Firewall router

Ok I throw in the towel. Before posting I ran read untold website forums / examples, tried lots of commands so please don’t say ‘Google is your friend’  I want to setup an Ubuntu virtual pc as a ...
0
votes
0answers
139 views

Creating routes using iptables in ubuntu 14.04

I'm a newbie at ubuntu's administration although I've been using linux for a while just at user level. Let's show my problem. This is my network (only static IP addresses are used, for both private ...
0
votes
1answer
49 views

keep getting added to hosts.deny + iptables

I am confused to why this has started to happen. On my local network, if I click 10-20 apache/http links my server will decide to add me hosts.deny file and block me on iptables. Its not just ...
0
votes
1answer
215 views

How to open the ports on firewall in Ubuntu? [duplicate]

I'm pretty new to Ubuntu. I just want to open the most common ports namely FTP (port 20 TCP/UDP) HTTP (port 80 TCP/UDP) SMTP (port 25 TCP) ETC I've tried all the ways in iptables, ufw, and gufw. ...
0
votes
0answers
224 views

UFW blocking random packets on 443

All, I have UFW setup to allow traffic on port 443. It works as expected, though I have a large amount of UFW Block log entries. To Action From -- ...
1
vote
0answers
37 views

Ubuntu Randomly Rejecting Hosts

currently I am facing a very strange problem: my Ubuntu is randomly resetting connections and I have no clue why. /etc/hosts.deny is empty (resp. just the default file with comments only, that comes ...
2
votes
1answer
632 views

Iptables rules no longer honored

I installed Ubuntu Server 64-bit 14.04 a week ago. It worked fine for one to several days, then out of the blue, iptables became meaningless (I noticed FTP and such are down ). Only ports 22, 25 & ...
0
votes
0answers
64 views

Unable to connect to Chromecast

I seem to be having a problem connecting to Chromecast from Ubuntu. Unlike the question How can I use Chromecast, the issue doesn't seem to be firewall related. I have already tried opening the ports ...
0
votes
0answers
64 views

iptables rules keep showing up

I just installed an ubuntu precise server, after a few weird communications issues I checked the iptables list and found: Chain INPUT (policy DROP) target prot opt source ...
1
vote
0answers
36 views

Connecting to Ubuntu host not possible

I have an Ubuntu-Host which is connected via wlan (and for testing to wired net) to a local net. This Ubuntu-Host is not reachable via network by any other clients on the same network. But: If I do a ...
0
votes
1answer
121 views

Ubuntu 14.04 denying incoming access

I just install a Counter-Strike: Source Dedicated Server on my Ubuntu 14.04 Desktop amd64 and I'm having trouble to allow incoming access to this server from the internet. I did a port forwarding on ...
1
vote
1answer
622 views

ufw configuration nat ppp0

please some tips how i can allow this request in ufw: [UFW BLOCK] IN=ppp0 OUT=eth0 MAC= SRC=10.11.22.2 DST=8.8.4.4 LEN=71 TOS=0x00 PREC=0x00 TTL=127 ID=52 PROTO=UDP SPT=59405 DPT=53 LEN=51 i tried ...
3
votes
1answer
74 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 ...
1
vote
2answers
82 views

What is MASQUERADE in the context of iptables?

In Iptables many times I see the target MASQUERADE. What is that. I searched and find lots of things. But I need some one explain me what MASQUERADE is in a so easy way? **If you bring an example ...
4
votes
2answers
302 views

UFW rules don't work with docker

I have a 12.04.4 server, and I have enabled ufw, and have tried to block port 8080. However, it is still open. $ sudo ufw deny 8080 Rule added Rule added (v6) $ sudo ufw status numbered Status: ...
0
votes
0answers
37 views

ufw is not working properly

I'm trying to enable ufw in remote ubuntu server. This server has two LXC container running. One container has nginx server running and I have hosted web application, right now every thing is working ...
2
votes
2answers
417 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 ...