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

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Ubuntu Server 14.04 Drop UDP packet

I use Ubuntu server as part of my system and now I have seen something interesting. I have a router that sends me ethernet 802.11 packets. I generate this packet in the router and then send it under ...
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8 views

cloud linux firewall port scan blocking my ubuntu desktop

My hosting provider's cloudlinux server is blocking my Ubuntu desktop every time I try to access the webserver. How do I find out what is causing this issue? Log shared with me.. May 28 13:49:32 ...
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1answer
49 views

UFW & VPN : How to allow reconnection

Here are the rules of my firewall : deny outgoing deny incoming allow out from any to any on tun0 (alow just the traffic from the VPN) However, I am forced to disable ufw when I want to start my ...
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11 views

UFW blocking 169.254.0.0 (link-local / apipa) addresses?

When using iftop on my wlan0 interface, there are a few link-local addresses connecting. How and where can I filter these connections? I have very specific UFW rules blocking 169.254.0.0/16, but I ...
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2answers
36 views

How to allow this connection on the Firewall?

I am trying to connect my Ubuntu Web Server to my Ubuntu Storage Server using NFS (Network File System). But when I try to mount a Storage Server to the Web Server, I get a "Connection Timeout" ...
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16 views

14.04 How to unblock UDP ports and UDP packets?

I'm use and Ubuntu Server, and I use it an Asterisk 11. But I have to unblocking the UDP Port 5089 and port for UDP packets in the range of 16384-16482. Also, I need to disable "SPI" in my firewall. ...
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1answer
21 views

How can i make both iptables/ip6tables run at startup?

I have two differents set of rules in two files, one is dedicated to ipv4 and the other for ipv6. To make them persistant I use the if-pre-up/if-post-down script : #! /bin/sh iptables-restore < ...
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53 views

Ubuntu Port Scan , Security concerns

Scan results of my ubuntu 14.04 $ nmap 127.0.0.1 Starting Nmap 6.40 ( http://nmap.org ) at 2015-05-02 08:43 IST Nmap scan report for localhost (127.0.0.1) Host is up (0.0021s latency). Not shown: ...
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1answer
31 views

ufw port accessible locally but not remotely

I am trying to access an application on my server I have running on port 8000. From the server I can access the application via curl mydomainname.com:8000 from any other machine I just get curl: (7) ...
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1answer
33 views

Do iptables support jitter simulation?

I'm using 14.04.1-Ubuntu. I'm trying to find out if iptables supports creating jitter, like it does for packet loss. I'm using iptables -A INPUT -m statistic --mode random --probability 0.02 -j ...
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34 views

configure rsyslogd to capture events from router device

I have DLink DIR 615 router, which is able to send syslog messages. I have enabled this type of sending on the router and set my Ubuntu server's IP as destination. On the server I made appropriate ...
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2answers
26 views

Firewall Ports for Filesharing With OSX

I tried searching for this but I'm coming up short. Maybe my wording is wrong. I have my Ubuntu machine showing on my LAN - and I can see it from the Finder Window in OSX - but it won't connect when ...
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0answers
27 views

Gufw log: rejected, denied and allowed connections

I have got Gufw installed, and I have set some firewall rules so that it rejects and allows certain IP addresses. And although I have set it so that it logs-all, I cannot seem to find anywhere where ...
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1answer
23 views

Ubuntu 12 ufw not allowing connections even if it says Anywhere?

Currently I can't seem to connect to my Ubuntu 12.04 server unless I disable my ufw or if I do a "ufw allow ip_address". When I do a "ufw status" I get the following: I deleted the allow my ...
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0answers
35 views

unable to start (Ubuntu server 14.04) iptables service it show “Unrecognized service”

Ubuntu server 14.04 iptables service start shows: Unrecognized service
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0answers
24 views

Web service only responding to local request

I have a webservice that listen on port 5678 on a remote ubuntu machine. netstats: tcp 0 0 0.0.0.0:5678 0.0.0.0:* LISTEN 10605/node I don't have any ...
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1answer
60 views

Do I need to install a firewall, or is there already one active pre-installed? [duplicate]

When I first touched linux, I installed Zorin. It's essentially an Ubuntu fork, but the desktop is redesigned to make it look like home to a person who has been using Windows for a long time. It came ...
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57 views

Why can't I connect to my localhost port from a remote computer?

I'm using link-grammar server to convert sentences into semantic graphs. It provides an API though a port to do the above process. It's configured to works through port 9000 of localhost. I used to ...
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38 views

Problem running ufw on Ubuntu 14.04 server

ufw is supposed to be the easy firewall for Ubuntu, but I seem to still having missed something. After a fresh install on my 14.04 server, and leaving it default, the terminal will freeze after ...
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0answers
24 views

UFW open range is still blocked

I have opened up a range of ports using UFW. The rules in question are shown below (output of sudo ufw status numbered). I have restarted UFW since I added the rule, yet in lnav I still see log ...
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0answers
71 views

ufw on ubuntu doesn't work, how to deactivate plesk firewall?

Since I'm a totally newbie to server stuff but I needed to set up a vServer, I let install Ubuntu 14.04 AND Parallels Plesk on it. Now, I think it would have been better to install Ubuntu without ...
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1answer
85 views

No UFW logs at syslog

I'm using here the UFW as a basic protection. When I'm using the wi-fi from the college I get some UFW block (which is normal, because the firewall is ON). But strangely, I'm not getting any UFW logs ...
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38 views

GUI Firewall status display

I'm looking for a panel item or screenlet or something to display the status of my firewall. /usr/bin/firewall-applet appears to be the right thing and it is already in "Startup Applications" ...but I ...
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96 views

iptables: write UDPv4: Operation not permitted (code=1)

I am trying to set up a stateful firewall using iptables. It is for use on my desktop machine. Below are the contents of my firewall script: #!/bin/bash iptables-save > ...
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1answer
73 views

Configure UFW to allow only established and related conections (on IPv4)

I want to configure ufw to deny everything except the related and established connections. On iptables I usually did : -P INPUT DROP -P FORWARD DROP -P OUTPUT ACCEPT -A INPUT -m state ...
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2answers
725 views

I think my PC is being hacked. What should I do? [closed]

I'm afraid I'm being hacked: My Ubuntu is receiving inbound traffic while my PC is disconnected from Ethernet and WIFI, so my question is, how am I receiving inbound traffic? I even have a firewall ...
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0answers
20 views

Ubuntu as a bandwidth throttling box on windows network

I need to test the performance of some applications over different capacity connections (broadband, EFM, LAN extension etc). How would i configure an Ubuntu server to sit between the main network ...
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0answers
32 views

Transparent proxy listening on sub-interfaces

I have iptables and squid on the same box. HTTP traffic doesn't seem to be going through the transparent proxy when I change my rules on the filter table. What is the best point to filter http ...
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0answers
18 views

OpenVPN disables DNS due to firewall

I'm trying to use an OpenVPN service with Network Manager. When I'm on wireless and activate the VPN, it works flawlessly, but when I'm on a wired connection, I have no Internet access. Through trial ...
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1answer
67 views

IP Tables allow HTTP and HTTPS

I am setting up a basic Firewall rules for my Laptop but I cant seem to get HTTP and HTTPS, thus using of the Webbrowser to work. My current rules are like this # 1. Delete all existing rules ...
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11 views

Subdomains Stopped Working after APF Firewall Install

I've just installed APF Firewall to my Ubuntu 12.04 server. Everything went fine and www.threecreative.co.uk is displaying okay, but none of my subdomains appear to be working. Any thoughts? For now, ...
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167 views

What is Network-manager trying to do with rdisc?

I have quite strict firewall setup using (g)ufw, allowing only some known to be useful outgoing traffic and denying the rest. I have noticed these recurring messages in syslog, and I'm wondering what ...
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1answer
134 views

I Had a Backdoor Mal Ware on W7. Will it Pass on to Ubuntu? [duplicate]

October 15, 2014, I got hit with a team of revenge hackers. They are working for my ex-father-in-law. He has been proxy stalking me since 2004 but since that has no effect on me anymore, he decided to ...
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1answer
48 views

UFW wont delete rule

I was testing something and added a rule to my firewall to allow port 9000. in retrospect, I should have just disabled it temporarily. anyhow, I went to remove the rule and it wont let me, it says ...
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1answer
31 views

Adding firewall rule makes multiple entries

I am trying to add a rule to my Ubuntu 14 iptables to allow NTP (123) though using the command for allowing Incoming Traffic on Specific Ports Basic iptables How to? Here is my command: sudo ...
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78 views

remote CORBA lookup (firewall, port, telnet)

I'm trying to do a CORBA lookup on a LAN from one pc to another. How do I troubleshoot the connection? On the server running glassfish: thufir@doge:~$ thufir@doge:~$ ...
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1answer
102 views

UFW - How to make it easier and what are stealth ports can UFW have these? [closed]

Let me show u what I jusat wasted 2 hours doing: To Action From -- ------ ---- 22 REJECT Anywhere 23/tcp ...
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0answers
126 views

error: Idle Subprocess didn't make a connection. Either Idle can't start a subprocess or personal firewall software is blocking the connection

When i run idle it returns the above stated error. It happened after I installed python 3.4. both 2.7 and 3.4 are giving this error.
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1answer
169 views

Adobe on Ubuntu 14.10

I want to install Adobe Master Collection CS6 on Ubuntu. I've installed Wine. ( the newest version. What I have allready done: sudo add-apt-repository ppa:ubuntu-wine/ppa sudo apt-get update sudo ...
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41 views

Iptables: some ports are closed despite being open by my iptables; can it be something else?

Beginner question. I set up the following iptables rules: #!/bin/sh # Réinitialise les règles sudo iptables -t filter -F sudo iptables -t filter -X # Bloque tout le trafic sudo iptables -t ...
2
votes
1answer
383 views

ERROR: problem running ufw-init

I tried setting up ufw on my remote Ubuntu 14.04 server so i installed it and allowed ssh with the command sudo ufw allow ssh after that I tried to enable ufw but I get the following error: ...
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44 views

How to know the all minimum privileges that software needs?

I am using a VPS as a public proxy, and I have begun to realize that I must make my VPS more secure as I have seen in Securing Public Shadowsocks Server. Shadowsocks is a fast tunnel proxy that helps ...
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3answers
393 views

Ubuntu / Apache2: I cannot open port 443 [duplicate]

I am trying to install a SSL certificat on my Ubuntu 14 server (using apache 2). For some reason the port 443 appears to be closed I installed and enable ssl /etc/apache2/ports.conf is as ...
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0answers
53 views

Firewall Config to get access to ports via eth0

My headless ubuntu Server has an OpenVPN client that connects to a gateway provided by PIA. I gathered some settings provided here to basically setup kill switch I have a domain that redirects to ...
0
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1answer
42 views

FTP and WWW services don't acknowledge connections

I have Lubuntu 14.04 LTS with vsftpd and the lamp stack (apache2, etc.) installed. Everything works fine on the LAN. Externally, the services don't acknowledge connection attempts. I can see packets ...
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25 views

VSFTPD setup not working

Good day I think I've been trying to tackle this issue for over 2 months now (with breaks of course) Here's the thing, I've set up the FTP server, it appears to be running (I can use Filezilla, ...
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1answer
48 views

Linux Firewall ala Outpost

Does linux (Ubuntu) have GUI firewall like Outpost. I need it to look out what apps are generate in/oun bound traffic.
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117 views

How can I allow ap-hotspot in ufw Ubuntu 14.04?

When ufw is enable android stuck in obtaining ip address and cannot connect to wifi. I try sudo ufw allow dhclient and sudo ufw allow dnsmasq bot both had ERROR: Could not find a profile matching ...
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36 views

I don't have a port allowed in UFW but still able to access server CP at it

Default of firewall (UFW) is to deny all that isn't allowed well 8083 isn't allowed but i'm still able to access the control panel with https://serverip:8083 Status: active To ...
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1answer
72 views

NFS Client Ports

So I've been trying to get my head around how an NFS client figures out which ports to use, or how to set them. I enabled logging (In iptables on the nfs client) for traffic between the nfs client ...