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

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97 views

How to tell if I have a firewall installed on my VM

I inherited a college VM I am trying to setup to accept remote connections to its MySQL DB from my local phpMyAdmin I am going through some SO Questions and tutorials (this/this) on setting this up ...
0
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1answer
153 views

Stateful Packet Inspection on Ubuntu?

By default Ubuntu doesn't have open ports (exceptions: Avahi and dhcp). Assuming that my system is connected to the internet by direct way (no hardware firewall used): If I am sending a UDP packet to ...
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1answer
213 views

Why ntpd needs an open port?

On my Ubuntu system I have activated the 'Time Synchronization via Internet'. Because of that the ntp daemon gets started. What I don't understand: Why needs ntpd an open UDP port 123? Actually, I ...
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1answer
694 views

iptables allow just internet connection

let me explain what I did before; # Only INPUT policy DROP, others are ACCEPT sudo iptables -P INPUT DROP sudo iptables -A INPUT -p tcp --sport 80 -j ACCEPT I also try this; for these ports to 443 ...
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1answer
285 views

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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1answer
3k 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 ...
0
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1answer
136 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
164 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" ...
1
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1answer
165 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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0answers
222 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: ...
0
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1answer
385 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
94 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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2answers
39 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 ...
0
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1answer
135 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 ...
0
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1answer
272 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 ...
1
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0answers
411 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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0answers
42 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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1answer
168 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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0answers
475 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 > /home/username/iptables....
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1answer
737 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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votes
2answers
1k 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
95 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 (17....
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0answers
131 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 ...
0
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1answer
360 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 ...
0
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1answer
2k 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
210 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 ...
4
votes
1answer
2k 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 ...
1
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1answer
104 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 ...
2
votes
1answer
497 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 ...
0
votes
1answer
273 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 ...
2
votes
1answer
2k 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: ERROR:...
2
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0answers
84 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 ...
1
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3answers
4k 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 followed:...
0
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1answer
70 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 ...
0
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1answer
137 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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1answer
446 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 ...
0
votes
1answer
343 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 ...
2
votes
1answer
231 views

loading “explicit” iptables rules on boot or interface up

I'like to load iptables rules on boot or interface going up on Ubuntu. Made a search on StackExchange and other places and looks like the most commonly agreed approach is either use iptables-save/...
0
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1answer
144 views

Ubuntu Server Firewall

First of all I am new to Ubuntu server. I am still trying to understand and learning about how does firewall. I want my firewall like if you fail 3 times it will time out. Is there any body could be ...
0
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1answer
203 views

Does Ubuntu come with a firewall? [duplicate]

I'm new to ubuntu, does it come with a firewall installed or will I have to install one, if so which one is best.
1
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0answers
22 views

Firewal for Ubuntu 14.04.1 [duplicate]

Is there a firewall for Ubuntu 14.04.1 that asks for every program that wants to enter or exit?
9
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2answers
9k views

Can't connect to PPTP VPN with ufw enabled on Ubuntu 14.04 with kernel 3.18

Suddenly VPN disconnected and can't reconnect no longer on kernel 3.18.1, so I try to install kernel 3.18.2 but my problem still exist. But I can connect to VPN with 3.14 kernel easily. The output of ...
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2answers
21k views

xbmc / kodi what ports to open on firewall so I can see files via upnp

I'm running xbmc / kodi 14.0 on my ubuntu 14.04 machine and I'm trying to view / watch my files located on my Kodi ubuntu machine from my nexus 7 tablet. I'm using bubbleupnp onmy tablet which can ...
0
votes
2answers
362 views

OpenVPN: Allow access only for local connections (via OpenVPN)

I was recently assigned a task to do set up a secure development environment. I am thinking of doing the following: Use OpenVPN to connect to the server. Use firewall rules to block all incoming ...
1
vote
0answers
80 views

Is this ufw configuration correct?

I have to link my openstack private cloud on a cloud management platform online. The cloud location is on my private ip (192.168.0.9) , i can't use that ip since the platform need a public ip so i ...
1
vote
1answer
6k views

How can I open port 80?

I'm new in Ubuntu, and I'm trying to open port 80. I have already set my router in order to do so, and I also set ufw. Status: active To Action From [ 1] 22/tcp ...
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1answer
246 views

How to block anything but internet(firefox) from UFW?

I want to use this flash drive only for secure access, to use my banking account and this kinds of stuffs. Which rules should I use? I'm very newbie on ubuntu, and I need your help. This flash drive ...
0
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1answer
256 views

How to connect remotely to WD Book Live Duo using nfs?

Connection in local network works perfect. I use nfs://192.168.0.10/nfs to connect locally. If I connect from internet I use static IP: nfs://xxx.xxx.xxx.xxx/nfs In this case it doesn't work and ...
2
votes
1answer
3k views

Forwarding ports with iptables not working?

I have an ubuntu server (14.04.1) which is asking as a router for my network. It has an internet facing interface, eth0, and a second interface, eth1, for connecting to my 10.0.0.0 network. I am ...
0
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1answer
120 views

How to perform detail packet capture on Ubuntu firewall?

I've routed internet traffic of my other systems on this ubuntu linux system where I have configured packet forwarding. but still I am unable to get internet on other systems. Hence I want to ...