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

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288 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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21 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
117 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
68 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
255 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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25 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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331 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
102 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
922 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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0answers
392 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
96 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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77 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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0answers
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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43 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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105 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
127 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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75 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
181 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 ...
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1answer
462 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 ...
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1answer
133 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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11 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 ...
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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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86 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 ...
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1answer
362 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. ...
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1answer
61 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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80 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 ...
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27 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 ...
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1answer
18 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 ...
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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 ...
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1answer
125 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
118 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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89 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 ...
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1answer
2k 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
119 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 ...
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1answer
145 views

IPTables/UFW not allowing incoming connection

I have two Ubuntu 14.04 virtual servers. One has IPTables/UFW on and enabled. It also has Vesta Control Panel installed. The other server is running some gaming servers, it does not have iptables ...
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3answers
177 views

NMAP tool results

I performed an nmap scan first via nmap 127.0.0.1(loopback address). It returned 999 ports closed, port 631 is open(correct since netstat -tlpn also shows port 631 is listening). Then I did a port ...
2
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1answer
603 views

How to configure iptables file to allow only specific ipaddress on all port and deny all other ipaddress?

I require a configuration of iptables file which will allow me connection through only specific ip-address say 10.0.0.1 on all port ranging from 0-5555 and deny all other ip-addresses? I have tried ...
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0answers
70 views

Configuring strong firewall rules

How to configure strong firewall settings via ufw? All inbound settings set to deny and only specific outbound ports to be allowed. Will the following be good enough? ...
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1answer
79 views

Network traffic blocker by ip and port

I'm getting continues traffic to my AWS ubuntu server. Those traffic increase my bandwidth billing in a high level. Is there any ip port blocker tool or a way to block those traffics?
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1answer
174 views

How to find port of a network scanner for UFW

Samsung multi-functional device SXC 3205w works perfectly with my Ubuntu 12.04 and I can scan and print over network, but only when firewall is disabled. How can I find out which port to enable in ...
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12 views

Setting up firewall for my hosting

I am having an Ubuntu 14 instance installed in Amazon Cloud. In there, I have setup apache2,tomcat7, and phpmyadmin. Any request to port 80 will be forwarded to the tomcat based java application. ...
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53 views

Server Not Allowing acunetix Crawler

My server is not allowing acunetix to run on it. acunetix is showing an error Sever unexpectedly closed the connection. I am running Drupal on a LEMP stack I am looking forward to see ...
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1answer
2k views

PFsense not working. Squidguard stopped

Hi I had tried to test the PFsense in VM VirtualBox. Let me explain the setup as follows: 1: PFsense installed VirtualBox (Server) em0 - 172.1.1.93 [WAN] vtnet0 - 10.10.10.1 ...
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1answer
46 views

Ubuntu noob, problem with IP masquerading; “Error saving the document ufw”?

I'm a noob and I'm used to the limited version of Ubuntu offered on TAILS, never did anything really technical with it, so i'm a complete noob here. I installed Ubuntu on my laptop. I have an UFW ...
3
votes
1answer
2k views

Uncomplicated Firewall (UFW) is not blocking anything when using Docker

This is my first time setting up an Ubuntu Server (14.04 LTS) and I am having trouble configuring the firewall (UFW). I only need ssh and http, so I am doing this: sudo ufw disable sudo ufw reset ...
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1answer
338 views

“Error getting authority: Error initializing authority: Could not connect: No such file or directory” when running gufw

I am trying to run gufw to enable traffic through port 443 (for Ogar, not Skype), and gufw logs: Error getting authority: Error initializing authority: Could not connect: No such file or directory ...
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1answer
82 views

Packet redirection based upon traffic type

Overview : Is there anything like ufw or iptables that will accept a packet on a port, but then redirect that packet locally depending on the type of packet it is? More info : I have a web server ...
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57 views

Port forwarding issue

i have successfully opened port 3306 for remote access to MySQL. i am trying to open another port (54321) to allow remote tcp/socket communication with a program. if used these commands: ufw allow ...
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0answers
134 views

Firewall configuration behind a proxy

Web access is given via a proxy server(port 8080). What inbound and outbound rules should one set up in the firewall(via ufw)? Is deny(incoming) and deny(outgoing) with an exception of "8080, allow ...