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

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Create a permanent rule for iptables in Ubuntu

In order to establish connection with my Ubuntu server I have to add the following rule to iptables: sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT Everything is working until I reboot the ...
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1answer
17 views

GUFW does not open for configuration in 16.04

Yes I have a dell Inspiron 15 3552 notebook, Intel Pentium N3700 with 4GB memory. Every time I try to open the blue and white icon, the password window appears. this I enter with no problem but then ...
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14 views

GUFW limit access to websites

Do anyone know how I can limit access to certain websites during specific hours of the day using GUFW? If GUFW do not have this ability, what can I use instead to achieve this function?
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28 views

Firewall with ability to block manually temorarily ip addresses, ports?

I have made a DDoS detection system that gives me info about malicious IP addresses and ports need to be blocked. Does anyone knows good solution of firewall, allowing me to do that. More automated ...
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13 views

Ubuntu 14.04.4 LTS: Firewall - block countries

I'm having trouble with my VPS. IPs from both China and Russia is trying to brute-force my VPS (not like there's anything interesting), and it's annoying. I'd like to ask, if there's any way I can ...
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1answer
45 views

Port forwarding/bypass firewall

I have two servers located at two different places: Ubuntu Server (MySQL) Ubuntu Server (Tomcat) The problem here is that the Tomcat server cant send data to the mySQL server over port 7878 because ...
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0answers
21 views

Transmission not downloading due to ufw

I set up ufw and it works nicely with every other service I have but Transmission is a mystery to me. It seems to start up and use different ports every time. Currently I've managed to get it to work ...
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1answer
48 views

Iptables rules slow down loggining in via SSH

I am trying to build some basic iptables rules for my VDS: iptables -A INPUT -p tcp --dport ssh -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT ...
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11 views

Scanner / printer firewall

My firewall is blocking the scanner from working but the printer works fine. Obviously when i turn off the firewall they both work. I can't figure out how to configure the firewall to allow the ...
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2answers
19 views

Is there a way to whitlist ip's and block everything else

So i'm running ubuntu on my vps. But the problem is that i have kids trying to figure out the password of the FTP connection and the VNC connection. (with succes). Now i want to ask is there a way to ...
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1answer
47 views

How can I block outgoing network traffic, based on useragent?

What would be the simplest method to ensure that all outgoing traffic matching specific user agent is blocked? To avoid XY problem: I want to disable “A new version of Sublime Text is available, ...
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1answer
27 views

VNC Server Missing and UFW disabled and iptables empty after update?

I have an Ubuntu 12.04 computer in the other room that I remote into using Remmina Remote Desktop Client and VNC on another Ubuntu 12.04 desktop. It worked about 1 month ago. Now Remmina hangs at ...
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1answer
86 views

IPTables: Block incoming traffic connection to your IP address of your virtual machine

Host OS: Ubuntu 14.04 Guest OS: Ubuntu 14.04 (Virtual Box) I want to block incoming traffic connection from Virtual machine with IPTables. I have searched, One solution I found is static IP for ...
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26 views

iptables for setting up a transparent proxy

I have set up ubuntu server 14.04 on VirtualBox with two network interfaces. auto eth0 iface eth0 inet static address 192.168.1.5 netmask 255.255.255.0 gateway 192.168.1.1 ...
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1answer
20 views

Clementine Remote with UFW

So I installed Clementine Remote for Android, to connect to my computer running Ubuntu 16.04. I am also running UFW, and when I tried to connect to Clementine, my Android Device was giving an error ...
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13 views

Set up website whitelist

I have a horrible problem with distraction, especially when I'm trying to do my writing. I could completely shut off networking when I'm writing, but I use a web-based music service to provide ...
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0answers
16 views

Bluetooth connect changes iptables behaviour

I have a very strange situation where a bluetooth connection seems to change the behavior of the iptables firewall. Let met start from the beginning: I have a Onkyo stereo amplifier with a bluetooth ...
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0answers
37 views

iptables, ufw, and psad - scanned UDP port alerts from router and devices on home network

I have a fresh install of Ubuntu 16.04. I configured iptables, ufw (with gufw), and psad using instructions from https://www.thefanclub.co.za/how-to/how-secure-ubuntu-1604-lts-server-part-1-basics and ...
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26 views

Knockd not recognizing knocked ports Ubuntu Server

I've got a server with knockd running. When ports 7000, 8000, and 9000 are hit, knockd is supposed to insert a rule into my iptables firewall and allow the connection to reach a port (22). For some ...
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1answer
51 views

SSH connection timed out externally, but works internally

Recently I tried to set my Ubuntu 14.04 desktop computer (I will call it "computer A") as a ssh server so I could access it remotely from my laptop (I will call it "computer B"). I installed ...
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2answers
39 views

Is there anything that should be done to increase security on a new system? [closed]

Let's assume I just installed Ubuntu on a laptop. This laptop may be used in different networks with different security measurements (at home, university, work place). Is there anything that should ...
1
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1answer
23 views

Can't connect to my ubuntu box outside my local network (VPN)

I have an Ubuntu 14.04 server running some services on different ports. I used to be able to connect to it (via SSH, samba, and a couple web servers on different ports) using a VPN. I'll use ssh as ...
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0answers
9 views

how to deny hosts to apache2..?

regarding a specific answer for how to deny access for the outer world to my apache2 webserver. ssh should be allowed and my official network should be able to access the web sites but no access from ...
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2answers
57 views

Confiruration DNAT in iptables

I have 2 PC be created by VMWARE 1. PC1 (make iptables router): ens33 's IP: 192.168.1.5/24 (network connection is bridged) ens37 's IP: 192.168.2.2/24. (network connection is wmnet9) 2. PC2 ...
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1answer
64 views

Application Express on Ubuntu Server refused to connect port 8080

Hi I am new to Ubuntu server and trying to get Oracle 11 xe with application express running on a headless VM Ubuntu server. Installation seems to be all good and everything running well from sqlplus. ...
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1answer
44 views

How do I permanently removing a ban stored by Fail2Ban

I have two filters that have banned local addresses. I have added the addresses to ignoreip but the damage was done already and the bans are in place. Every time I reboot my computer I have to do an ...
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0answers
15 views

VPN HideMy_SS Connection Issue

I've spent more than a few hours searching through forums, and contacting HMA support, a bit useless in this case. Anyways, here are my observations. If UFW / GUFW is enabled with all inbound and ...
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0answers
12 views

ufw to be enabled by default?

The 'Ubuntu Security Features' page [ https://wiki.ubuntu.com/Security/Features ] states : "Configurable Firewall. ufw is a frontend for iptables, and is installed by default in Ubuntu (users must ...
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1answer
67 views

xrdp on ubuntu server

I have set up xrdp on my ubuntu server 15.10, with mate desktop environment and it all works fine and dandy. Except for when I enable UFW. I have the following ports allowed all tcp 2222 (ssh) 3389 ...
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112 views

Firewall configurator not opening after upgrade to 16.04

after upgrading to 16.04 the firewall configurator is not showing up any more. The firewall itself (UFW) seems to be running as: sudo ufw status returns active and my rules. running the GUI from ...
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2answers
1k views

gufw on ubuntu 16.04 don't run

It doesn't run properly when I click and closes automatically.
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0answers
13 views

IP changed and can't start Xwindows now

Client PC: Windows 7 with Putty 0.63. The IP changed on this PC. Ubuntu 14.04 Ubuntu shell: bash On client PC the Xwindows server is Hummingbird Exceed v14. All this worked fine until my client IP ...
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1answer
30 views

Can you run a VPN connection over HTTP?

Is it possible to connect to a VPN Server having a tunnel over port 80, thus eliminating all the port blockings of a firewall?
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1answer
70 views

Why using (or not) dedicated bridges with LXD?

Question: Are there specific drawbacks of using a single bridge, as opposed to a dedicated one per container? Details: I have a host which runs a few LXD containers. I initially decided to have one ...
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1answer
36 views

Block IP beginning with, U.F.W

Someone is running a registration bot on my site and I have taken steps to prevent the registration, but now I want to block the whole IP range from even being able to access my site. I have set up ...
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0answers
25 views

OpenVPN Ubuntu Server Routing Problems No Internet

I'm running OpenVPN on Ubuntu 15.04. When I connect to the server, I can connect and authenticate correctly (I use PAM auth because I'm lazy). Once connected I can't ping the server or access the ...
0
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1answer
33 views

Block port on one network address

I'd like to block a series of ports (mailserver) for all the network addresses on my server except one. I've got a server running Ubuntu 14.04.4 and configured with 2 ipv4 addresses per Linode's ...
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0answers
20 views

torrent blocker for network

Does anybody know of a great torrent blocker which blocks all torrent traffic in a network. We are currently using untangle, which works great, but i was just wondering if there are maybe other good ...
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1answer
34 views

iptables is blocking only some connections to port 80

I'm running a Ubuntu 15.10 server with an nginx webserver on it. I've used the following iptables configuration to allow port 80 and port 443 connections: *filter # Allow all loopback (lo0) traffic ...
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2answers
27 views

Network configuration | apt can't download anything

I'm having some issues with the FTP server I'm currently setting up for my company. I installed the server completly, updated everything and the server works fine now. I installed everything behind a ...
3
votes
1answer
48 views

How do I block Internet for an app using an apparmor custom profile?

I'm trying to block internet access for an app because it always asks for purchase or update even though it's free. I created an apparmor profile for that app and enforced it but after enforcing, the ...
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3answers
49 views

Adding VPN to firewall UFW

I'm having trouble at work in connecting to the work VPN while Firewall (UFW) is active. When i disable it "sudo ufw disable", there are no problems. When it's on, when trying to connect I receive ...
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0answers
28 views

static arp with a wlan repeater

The scenario: when i activate static arp at my dhcp settings in pfsense i can't access pfsense itself. but when i deactivate static arp i have access to pfsense. then i found out with a wireshark ...
5
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1answer
81 views

Accessing a LAMP webserver that's behind a Ubuntu VM acting as a firewall

I currently have two VM's set up in the following manner: /-----------------------\ /-----------------\ | Ubuntu VM | /---------------\ ...
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0answers
30 views

Easiest way to forward a port on local network

I have a server (python -m http.server) running on hostA:8000. Say I want to forward traffic from hostB:8004 to hostA:8000 How can I achieve that from hostB? I've already tried, $ sudo ufw allow ...
3
votes
1answer
51 views

Using UFW with ipsets

I am running Ubuntu 14.04 on a VPS for business purposes. The firewall is setup using ufw; testing reveals that it's working well. I'd like to further secure my server using techniques described ...
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0answers
34 views

Printing with UFW

I have just set up a print server using CUPS and Avahi to allow printing from iOS devices on my home server. I have UFW set up to block all traffic that isn't on my VPN or over LAN. I have even set up ...
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1answer
60 views

UFW rule doesn't work

At first enable the ufw status. root@sai:~# ufw status Status: active It blocks both incoming and outgoing connections, tested by using ping ssh from both sides not working. root@sai:~# ping ...
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34 views

How to make ufw allow only connections from outside lan

I am setting up a server at home from an old pc with ubuntu, and would like to "separate" it from my local network by configuring the firewall to allow only connections from outside my lan. I found a ...
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0answers
30 views

How to block Internet access for some devices on given hours?

I have a Ubuntu machine (15.10) running as a gateway which routes / firewalls traffic between a LAN an Internet. I need to block Internet access during some hours for specific devices on the LAN. ...