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

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99 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 ...
0
votes
1answer
909 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 ...
2
votes
0answers
381 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 ...
2
votes
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 ...
0
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1answer
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 ...
0
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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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0answers
41 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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0answers
103 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 ...
1
vote
1answer
124 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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vote
0answers
71 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 ...
0
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1answer
179 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
429 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
votes
1answer
129 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). ...
0
votes
0answers
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 ...
2
votes
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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0answers
84 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
votes
1answer
352 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
votes
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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0answers
79 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
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 ...
0
votes
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 ...
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
vote
1answer
123 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?
0
votes
1answer
116 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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vote
0answers
88 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 ...
1
vote
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
votes
1answer
113 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 ...
0
votes
1answer
142 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 ...
2
votes
3answers
176 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
votes
1answer
578 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 ...
0
votes
0answers
67 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? ...
0
votes
1answer
77 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?
2
votes
1answer
172 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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0answers
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. ...
0
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0answers
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
1answer
333 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 ...
1
vote
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 ...
0
votes
0answers
56 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 ...
0
votes
0answers
128 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 ...
0
votes
1answer
489 views

How to configure UFW for a basic desktop / laptop? [closed]

Reading this answer about enabling UFW, I understand that a computer without firewall can be safe in my local network, but this same safe configuration on a laptop used outside of my local network ...
0
votes
1answer
206 views

tcp, where to start looking? I can reach server from LAN but get CONNECTION RESET from WAN

I have working websites running under Apache. They are perfectly accessible from the LAN. I also set up part of the server to be accessible from WAN. This worked at first (beginner's luck, no ...
2
votes
2answers
160 views

How to find out where iptables rules come from?

I used to have my own set of iptables rules on my Ubuntu 14.04 LTS installation. This was residing in /etc/network/if-pre-up.d/iptables. Now, apparently after another apt-get dist-upgrade it looks ...
2
votes
1answer
2k views

UFW - allow range of IP addresees?

I can add a rule using UFW firewall to allow a single known IP 192.168.1.32 to access my test webserver (192.168.1.48 (on a local mostly trusted network) on Ubuntu 14.04 using: sudo ufw allow proto ...
0
votes
2answers
7k views

Open port 80 on Ubuntu server

I'm just starting out in ubuntu/linux, and have some trouble opening port 80 for incoming connections. I ran the sudo ufw allow80/tcp command, and when I run sudo ufw status the result looks like ...
0
votes
2answers
82 views

Notification whenever a program connect to internet/outside

I always use public WiFi in my college. Hence I thought of setting up a firewall. It was not as easy as I thought. My current set up is that all incoming connections are blocked except ssh. Is there a ...
0
votes
1answer
194 views

Forwarding all Internet Traffic over VPN (PPTP UFW)

I've set up a VPN using the guide here but what I cannot seem to get working is forwarding all my internet traffic over the VPN. I can connect and view the other machines on my network. I am using ...
0
votes
0answers
226 views

Webmin Linux Firewall NAT and Packet Filtering

Can someone explain to me the difference between these two? Like in NAT and Packet Filtering there are rules for both incoming and outgoing packets. I do not really understand their differences. What ...