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

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How to notify administrator with mail in case ubuntu firewall stops

Is there a notification application to warn administrator in case Ubuntu firewall stop accidentally ? Thank you.
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1answer
99 views

configure iptables to redirect traffic to a specific IP address

I have just began using iptables. I have a server with a public ip address (A.A.A.A) wich is hosting a Virtual Machine (B.B.B.B) on local network. I want to redirect all inbound traffic on the port ...
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52 views

domain not forwarding via dnsmasq

I'm using : Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty And Dnsmasq version 2.68 Copyright (c) 2000-2013 Simon ...
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24 views

Firewall zone not changing when activating VPN

How can I make the Firewall zone change automatically at VPN connect? I have set up Firewall with firewalld and firewall-config GUI. There is many preset zones, in which "home" has all ...
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61 views

Disable USB Port & Website Block/Allow

I want to lock USB Mass Storage (Pendrives & External HDD), Mobile Storage Access on my Ubuntu 14.04 LTS Desktop Version. Simply, I need only use of USB Keyboard & Mouse, no Other USB Devices. ...
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67 views

why can vsftpd by passive mode work with firewall allowing only 21 port?

I have a question. Why can vsftpd by passive mode work with firewall allowing only 21 port ? I open only 21/tcp port. $ ufw enable $ ufw allow 21/tcp $ cat /etc/vsftpd.conf | grep pasv ...
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1answer
58 views

How to resolve multiple hosts inside a NAT firewall

My apologies if this has been asked before, but I can't seem to find a complete solution. I have a hosted sub-domain at no-ip.com with a wildcard DNS option enabled. On my end I have a firewall ...
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80 views

cannot load ipp2p

i've tried to install the xtables-common-addon but when i try to load the ipp2p rules to firewall, iptables doesn't seem to understand the commands. It returns an error. do you know a workaround ...
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1answer
100 views

iptables block port from local network

I have a problem inside my infrastructure. chat.example.com port 8185 is reachable outside my infrastructure with a port fowarding to the right box. But inside my infrastructure, i'm not able to reach ...
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89 views

Configure Leopard Flower (LPFW) to start at boot

I have just downloaded LPFW from here: https://github.com/themighty1/lpfw. Everytime I acces my computer I have to run sudo ./lpfw and start the GUI executing gui/gui.py to run the program. Is there ...
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119 views

What's the purpose of economy.canonical.com?

I noticed that in one of my server's /var/log/ufw.log this morning that the firewall had blocked the IP address 91.189.91.23 from accessing port 80. This occurred 9 times within about a minute and a ...
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2answers
54 views

How to check this port?

i'm on ubutun 12.04LTS and this error appeared ChannelException: Failed to bind to: 0.0.0.0/0.0.0.0:6702 need help to check where is the problem ? can i check if the port are busy or closed ? ...
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2answers
1k views

After 15.10 update, I can't play Minecraft or FTB

I have been able to play Minecraft fine earlier, with Xubuntu 15.4. Yesterday when I updated to 15.10 I am unable to play online. Here is the launch log. I have tried reinstalling both Minecraft ...
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1answer
42 views

Is there an iteractive firewall extension available for Ubuntu?

Every time something on my computer tries to contact an external host or an external host tries to contact my computer I would like to be asked if I authorize this and if I would like to create a rule ...
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1answer
77 views

Iptables firewall rules not restoring on server restart [duplicate]

I am setting up iptables on a new instance of Ubuntu 14.04 server. So far I have: put iptables rules into a file /etc/iptables.firewall.rules created a script ...
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1answer
313 views

LXD container refusing connections from the host

I'm pretty new to LXD having recently discovered it. I'm making progress with the basic interactions with images and containers - it looks promising. Currently I am stuck on a problem connecting ...
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22 views

Network crashed?

So I have a server from ovh. When I was messing with the network I went to flush iptables and reload the network, and well it crashed all of the ports. So I thought I just need to reboot the server, ...
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1answer
139 views

Can't ping my IP address

I cant ping my own IP address for my machine running Ubuntu. I have tried to ping the machine with an external VPS but I still have had no luck. I have opened port 80 (TCP) even though I don't think ...
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1answer
74 views

Soap server port not visible to client

My soap server running on port 44485. Following is the netstat command output after start the server. $ netstat -ant | grep 44485 tcp 0 0 0.0.0.0:44485 0.0.0.0:* ...
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1answer
278 views

Enabling Conntrack for iptables to work on openvz container?

I'm trying to use iptables on my newly purchased openvz container. Everything was going well until I noticed that apt-get wasn't working, looking round I discovered some tutorials which said that ...
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26 views

How can I access my BitTorrent Transmission over Web from another computer which is not on my network?

I am using Ubuntu 14.04 with BitTorrent transmission 2.82. I had already allowed the Remote Access with Default Port 9091 and username and password in the settings of Trasmission. Only from these IP ...
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358 views

How can I configure my firewall (iptables) to allow Counter-Strike: Global Offensive to connect to the local Steam Client process?

When my firewalls (iptables) are enabled Counter-Strike: Global Offensive fails to launch with the following error when starting csgo: FATAL ERROR: Failed to connect with local Steam Client process! ...
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1answer
38 views

Firewall config

I am trying to see if it's possible and what commands need to be done. I am trying to block all outbound traffic to a specific ip on my local network. The back story is I am using plex and I don't ...
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1answer
112 views

What Ports do I need to keep open to access my SSH Server with non-default Port

I'm not using Port 22 for my SSH but something above 47000 I have ufw (uncomplicated firewall) installed and have unblocked "ssh" and "http" When I look into the current ufw status he says that Port ...
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1answer
1k views

Troubleshooting accessing console of phpvirtualbox - TCP: SECURITY_ERROR Error #2048

Ok, so I just had a server crash tonight. Reinstalled a backup Clonezilla image, restored website from tar/sql dump. But whenever I "update" virtualbox I get an error and end up just uninstalling ...
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481 views

Can't ssh into my home PC remotely

I have a computer at home running on 14.04. I would like to be able to send jobs to that computer (I will call it server) from my laptop (running on 15.04) and share files between the two. I am able ...
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2answers
101 views

Is Uncomplicated FireWall (ufw) a service?

I am currently studying iptables and ufw on Ubuntu server. While playing with them I came across an ambiguity about the true nature of the ufw. Here is the problem: When I run sudo ufw status in ...
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1answer
87 views

Gufw is running, but no ufw process running. Normal?

Gufw is protrayed as a front-end to ufw, but when Gufw is running, I don't see ufw running. When run ps -ef | grep ufw, should it report processes for both ufw and gufw, or would we only see gufw if ...
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1k views

RTMFP server: connection failed

I am using Firefox 41.0.1 on Ubuntu 14.04 LTS. I installed pepperflashplugin to work on Firefox via PPA to access the options on Adobe Flash Player Settings. Worked fine. But now, I cannot connect to ...
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45 views

Ubuntu 12.04 port 515 open permanently & no closed in Gufw comand: ufw deny 515

Desktop Ubuntu 12.04 port 515 open permanently & It does not close the port 515 team: ufw deny 515, but Gufw reports that the 515 port is deny. After this prosedure: nmap report: port 515 open ...
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112 views

apt-get fails behind squid proxy

I use proxy server to connect to internet. The server is a squid proxy, which blocked certain requests. Things not working: ping apt-get traceroute6 Things working: curl wget When I do ...
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1answer
132 views

Will enabling ufw through ssh disrupt current session?

I have an ubuntu server that I access through SSH. I've changed standart port (22) to something else. I want to enable ufw on this machine. However, I'm afraid of the possibility of the following ...
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81 views

How to configure FileZilla on xubuntu

I'm trying configuring FileZilla on Xubuntu latest version but at the end of the Wizard the message is: Connection with server got closed prematurely. Please ensure you have a stable internet ...
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1answer
195 views

automatic port forwarding server how to

this question may be a duplicate ... but I don't seem to find any answer what can I use as automatic port forwarding on a Linux server ? I am ONLY interested in something like upnp (so, stations ...
5
votes
1answer
558 views

How to block internet access for an application

I'd search for a way to run an application prevent it from accessing internet, possibly without install a specific program to do this. Most of the answers I've found refers to THIS post, so I tried ...
0
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1answer
154 views

Inter container network communication blocked in docker

I am starting with docker and I have decided to spin up my gitlab instance in a container as well as gitlab-ci-multi-runner to perform my CI builts (just to test the possibilities of the flow). ...
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12 views

How to configure from scratches a monit server?

Hey guys is anybody knows : How to configure a monit server on ubuntu 12.04 from scratches? which firewall needs to be disable or add to help him browse on 2812? any Doc, YouTube video well done ...
2
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1answer
57 views

Need help with iptables

i'm Russian so sorry for my English. My Russian friends from forum.ubuntu.ru can't help me. I need to route all connections to my IP to kvm virtual mashine With iptables-restore: *filter -N ...
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101 views

I can't open a port using iptables

I want to open a port, I used this command: iptables -A INPUT -p tcp --dport 1111 -j ACCEPT when I use nmap command nmap localhost it doesn’t display the 1111 port ps. I'm using debian-7.8.0 Any ...
0
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1answer
414 views

how to block ip address with IPTABLES on ubuntu 14.04 desktop?

First, I've been setting up local IP Public IP add. in directory /etc/network/ interfaces file # This file describes the network interfaces available on your system # and how to activate them. ...
0
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1answer
62 views

Locked myself out of Ubuntu

Im after some help desperately! I currently have a server running ubuntu 14.04. I access it using a macbook pro and chicken VNC. All was fine until a few days ago i decided to increase security and ...
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0answers
87 views

Squid Proxy Server not working using my private dns when in DMZ

I configured a squid proxy server using ntlm-active directory authentication which works fine when deployed in the LAN but when I move it to the DMZ, the authentication fails and hence clients are ...
0
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0answers
28 views

Ubuntu 14.04 showing port 80 as filtered

I am having a problem connecting my ubuntu 14.04 machine to the Internet. The machine was working fine and suddenly stopped working. I can ssh into the machine using ssh gateway but I can't ping the ...
0
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1answer
19 views

issue with dhcp default network file

I'm installing dhcp server on Firewall and under that firewall i setup two clients who ll get dynamic ip addresses. I give static ip address to eth1 port on which i'm installing dhcp server on ...
0
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1answer
39 views

Monitoring tool for Ubuntu

I am running a Ubuntu server for NAT and DHCP services in my Office. What monitoring tool can be used to remotely monitor server performance, DHCP lease addresses, IP Lease statistics, monitor ...
1
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1answer
128 views

Why cannot allow/deny specific software in ufw Linux?

Why cannot allow specific software (like Firefox) to use internet but deny other software (link Chrome) that are using same port in ufw? In windows there is the feature, why ufw don't have that?
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1answer
132 views

port forwarding to Arduino device on home network

I have a home server running Kubuntu 14.04. It serves a web page to the outside world and provides internet access to all devices on my home LAN. I have an Arduino device with a web server application ...
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94 views

Ubuntu machines cannot connect to each other on the same network

I'm having trouble with Ubuntu machines not cooperating on my home network. The network structure is VERY simple. It's simply two Ubuntu machines (one running XBMCbuntu on 14.04, the other Ubunutu ...
2
votes
1answer
3k views

Port forwarding with UFW

I realize UFW is mainly just for enabling/disabling access on particular ports, but I'm trying to forward one port to another. I want any connection to port 1724 to be forwarded to 1723. The file ...
2
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1answer
125 views

Check existing ufw firewall rules without enabling it

I'm using Vagrant to run an Ubuntu 12.04 LTS box. $ sudo ufw enable Command may disrupt existing ssh connections. Proceed with operation (y|n)? Obviously, I don't want to disrupt my SSH connection ...