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

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iptables rule traverse order

Here is partial output of my iptables: **Chain OUTPUT** (policy ACCEPT) num target prot opt source destination 1 ufw-before-logging-output all -- 0.0.0.0/0 ...
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33 views

nmap scan on Ubuntu results in odd result

1. I ran an nmap scan on my system and this was the out put. hobbit@hobbit-OptiPlex-GX520:~$ nmap -v sU sT 127.0.0.1 Starting Nmap 7.01 ( https://nmap.org ) at 2016-06-25 20:08 IST Initiating Ping ...
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12 views

How to make a SSH connection if my proxy server doesn't allow connections at port 22?

My college internet uses a proxy server to provide internet to the students with a firewall which only allows connections at port 443 and port 80 and blocks others. I want to know is there anyway I ...
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18 views

Sharing through Iptables stopped working

I have a server connected with the internet and the local network. The configurations are: eth0 - 192.168.10.1 eth1 - 192.168.0.6 (Internet) When I wanted to share the internet with other computers,...
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22 views

SoftEther VPN Server returning error. “Error occurred. (Error code: 1) Connection to the server failed. Check network connection …”

This topic had already been discussed in SoftEther VPN Server can't connect during set up. But cannot find the solution here in my case. Tried commenting still not received a resolution. So ...
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28 views

Redirect iptables logging to another logfile

I have followed the recipe by @Gilles in this answer. I succeeded, but the problem is that the iptables logging now goes into 3 log files, syslog, kern.log and iptables.log. Ideally, I want the ...
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14 views

Prevent Outbound IP Address spoof

We have multiple computers running Ubuntu Desktop, all connected to same Router. Using UFW firewall, all inbound and outbound ports are blocked on these Desktops, except for only one outbound port (...
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22 views

UFW doesn't do anything

I have an Intel nuc running Ubuntu Server with UFW enabled and im trying to block port 8112 however i can still reach it from outside my network. I have tried the following sudo ufw reset sudo ufw ...
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21 views

figthing with firewall configuration and samsung network printer in Networking & Wireless

I've configured my Samsung SCX-3205W printer and scanner in Ubuntu 15.10 and everything worked fine until I've turned on firewall. After some forums reading and some fighting I've discovered that it's ...
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39 views

UFW issue in Ubuntu LTS 14.04

While executing shell command ufw status && ufw enable - I am getting the error message below: iptables v1.6.0: can't initialize iptables table `filter': Permission denied (you must be ...
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21 views

Allowing access from only a specific IP does not work

I would like to access port 22 (ssh) of a computer whose OS is Xubuntu 15 from a specific laptop with Windows 10 and external IP x.x.x.x using Putty via Internet (i.e., these computers are not in the ...
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12 views

Motor Control with Firewall Application

I am working on a project which calls for 4 axis coordinated motion control along with a multi port firewall all in one. In reading through the forum it appears that the Snappy Core would be a good ...
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22 views

How to add ip to firewall wineHQ

I used Wine HQ 1.9.12 and I have problem with settings from firewall. I want ask about firewall because I must add ip allowed. This is my allowed connection. How can I add new ip ?
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42 views

How to use iptables to prevent repeated attacks on port 80?

There a is massive attack on port 80 on my Server i try to use iptable This way to banned attackers iptables -A INPUT -s 212.252.96.128 -j DROP but there are too many IPs attacking how to prevent ...
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22 views

UFW Blocking Legitimate Traffic

I am currently getting this kind of message in the UFW and sys logs: xxx kernel: [4962636.572484] [UFW BLOCK] IN=et0 OUT= MAC= SRC=xxx.xxx.xxx.xxx DST=xxx.xxx.xxx.xxx LEN=52 TOS=0x00 PREC=0x00 TTL=52 ...
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25 views

Access to white IP when VLAN is not default

I have Ubuntu 16.04. VLANs in NetworkManager. As per picture , I have 1 Eth interface and 3 VLANs, each with it's own GW. The default VLAN at the time is 5 (NAT). The other VLANs have white IPs ...
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77 views

How to Block a range of IP address with UFW

I am trying to block a range of IP address on my Ubuntu 16.04LTS server from a specific country, i.e. China, Iran, etc. I was hoping to find a script or something I could run to easily make a ...
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32 views

redirect traffic from server 1 to server 2 on specific ports

I am trying to redirect traffic from server 1 on IP A to server 2 on specific ports and IPs. i am using this rule as an e.g. - iptables -t nat -A PREROUTING -s 192.168.1.1 -p tcp --dport 1111 -j ...
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23 views

What ports do I need to open for NFS on UFW?

I currently have ports 111, 1110, 2049 and 4045 open and I am having an issue connecting to my kodi clients. When I disable UFW, everything connects just fine. I have googled and haven't found any ...
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32 views

How do I block traffic from certain VPN clients?

I have a Ubuntu 14.04 server setup as a VPN Server. I have several Ubuntu Desktop machines which connect to the VPN server using PPTP - all works fine. My problem is that I need the VPN clients to ...
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17 views

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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62 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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15 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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31 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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22 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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50 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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29 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
56 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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21 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
26 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
76 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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38 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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99 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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42 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 dns-...
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1answer
30 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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19 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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21 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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31 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
64 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 openssh-...
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43 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 ...
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1answer
26 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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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
65 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 (...
2
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1answer
100 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
50 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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16 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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15 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
85 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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124 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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2k views

gufw on ubuntu 16.04 don't run

It doesn't run properly when I click and closes automatically.