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

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2k views

Installed Xubuntu desktop on Ubuntu 12.04 server and now can't connect via SSH

I have a ubuntu 12.04 server that I could connect to fine using ssh over the internet. I installed the xubuntu desktop on it, didn't change any settings, then suddenly ssh stopped working. I can ...
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1answer
547 views

Ubuntu Windows Installer - Firewall

I installed Ubuntu with the Windows installer to use it along side. I could not find anything to activate a firewall so I thought its inbuilt and running. However now I read that I have to activate it ...
3
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2answers
7k views

How to configure UFW to allow IP Forwarding?

I have UFW, OpenVPN and Virtualbox installed on my home server. I have a host-only network for my virtual machine guests (vboxnet0) set up with the IP range 10.0.1.0, and another IP range of 10.0.0.0 ...
2
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0answers
245 views

Why is SSH not accessible after installing KDE on Ubuntu Server?

I installed KDE onto my Ubuntu server, which is operating as a file server. It installed a firewall that wasn't there previously. I can't reach any of the services I had operating on the box now, ...
5
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1answer
7k views

MySQL server not accessible from remote machine

I have installed MySQL server in my local Ubuntu server (11.10). I can't connect to the server from a remote machine. When I tried:- nmap localhost , It shows the following PORT STATE SERVICE ...
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1answer
910 views

Setting up port forwarding on my router to Ubuntu machine [closed]

I just loaded up a older computer of mine to run a server for a game I'm working on, (it's a template server) and I need to forward ports 3200 and 3201, so that it can be accessed both on my local ...
3
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1answer
20k views

Currently what is the best Firewall & Internet security for Ubuntu? [closed]

Currently what is the best Firewall & Internet security for Ubuntu?
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1answer
102 views

New User to Linux in general (Setting up a hardware firewall, needs interface config and ufw config help!)

I'm very new to this new environment (coming from Windows) and I need some help setting up a hardware firewall and web server combo. I already have my website set up and I would like some guidance on ...
2
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2answers
11k views

How do I allow all possible IPs for Gmail servers through my ufw firewall?

I am currently using the following rule: ufw allow out from my_local_ip to any port 587 This is a little too lax for my liking. I would like to tighten it up and restrict it to only gmail's smtp ...
6
votes
2answers
4k views

What do UFW's audit log entries mean?

I'm sometimes getting a lot of these AUDIT log entries in ... [UFW AUDIT] IN= OUT=eth0 SRC=176.58.105.134 DST=194.238.48.2 LEN=76 TOS=0x10 PREC=0x00 TTL=64 ID=32137 DF PROTO=UDP SPT=36231 DPT=123 ...
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votes
2answers
1k views

How do I set up a linux proxy for my mac

As my title suggest, I would like to set up a proxy in linux. The client that I'm using is a mac osx lion. I think I understand the theory but I keep hitting roadblocks. I started using set proxy ...
3
votes
1answer
516 views

local development LAMP server: routing external requests through SOCKS proxy

I've got a (virtualized) local LAMP server on Xubuntu 12.04 that I am using for Drupal development. I'd like to learn how to use web 2.0 integration Drupal modules (eg. youtube, facebook, etc.) but I ...
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2answers
1k views

iptables problem

Hi guys i have the follwoing iptables file for my ubuntu 12.04 server. ITs a bit messy because i tried different ways to fix it but the problem is it doesnt allow apt commands such as apt-get to run. ...
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1answer
218 views

How do I use “ld_preload” to control what apps can and cannot connect to internet?

I'm trying out Ubuntu. Been a Mac user. I like ubuntu a lot but I find it unnerving to not have any control over what apps can & cannot connect to the internet. I was advised that "ld_preload" can ...
13
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8answers
6k views

Alternative to Little-Snitch app-firewall?

I'm trying out Ubuntu. Been a Mac user. I like ubuntu a lot but I'm uncomfortable not having an app-firewall that reports what connections are being made to the internet. I find it unnerving to not ...
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3answers
2k views

Is the firewall active or not?

I'm confused about the status of my firewall. Using the Ubuntu Software Center, I have installed Gufw. Problem: When the Firewall is locked, it looks like it's inactive. But when I unlock it, it's ...
1
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1answer
93 views

How to add a rule for loggin packets in ufw

I'm seeing a lot of connections with source 0.0.0.0 and destination 0.0.0.0 in conntrack. I want to log these packets which have source 0.0.0.0 and destination 0.0.0.0 so that I can digg this issue ...
3
votes
1answer
2k views

How to prevent certain applications from accessing the internet?

I want to prevent certain applications from accessing the internet. When I was using windows XP I had an application (i think it was Zone alarm) which always notified me when an application tried to ...
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1answer
1k views

How to set fail2ban with apf?

I just installed fail2ban and the apf firewall. Those 2 seems to be not working together. Fail2ban have added some ipatble rules but they are not working. When I issue "/etc/init.d/iptables status" ...
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vote
1answer
730 views

Different responses when telnetting into mysql's port via hostname

I'm trying to connect to mysql server installed on my computer. When I enter "telnet localhost 3306", I get some garbage characters meaning that I'm connected to the server. But when I enter "telnet ...
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votes
4answers
6k views

What ports should I open for listen and/or transmit in my firewall to keep internet ok? [closed]

What are the minimum ports and services that should I allow/open for listen and/or transmit in my firewall (I am using Firestarter) to keep my internet running ok? Some talk about what services, ...
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0answers
2k views

UFW Settings - Application Integration [closed]

I have installed the Ubuntu system, and deny both incoming and outgoing ports loosing internet access. Now I want access only for my Firefox that I have installed separately from the Firefox website ...
6
votes
1answer
17k views

What are ICMP redirects and should they be blocked?

After enabling ufw and the Tiger security auditor, I see warnings saying: The system accepts ICMP redirection messages What are ICMP redirection messages? Should they be disabled for security ...
2
votes
2answers
4k views

iptables mac address filtering not work

I block every port default by ufw and add iptables rules like this: sudo iptables -A INPUT -p tcp --dport 1723 -m mac --mac-source 00:11:22:33:44:55 -j ACCEPT then I list iptables INPUT rules: ...
6
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2answers
4k views

UFW is not logging how do I troubleshoot?

I have set logging to high. I am not seeing any log messages. I do see the empty ufw.log file. No messages in dmesg
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2answers
1k views

How to make an internet server as firewall using ubuntu 11.10

i have one static broadband connection which is coming to my Ubuntu server with 2 lan cards, there are 10 more PC's to which i need to provide internet connection through Ubuntu server as well as i ...
0
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1answer
330 views

How to update firewall to pass NFS traffic?

I have set up the NFS Service using these instructions and it was working fine last week but today I get this error: Root-NFS: Unable to get nfsd port number from server, using default I ...
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1answer
571 views

How do I check the status of apf firewall?

How to check whether apf (Advanced Policy Firewall) is running after the reboot? It doesn’t have any status, so how can we know?
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1answer
352 views

Interactive Firewall

I have Ubuntu Server 10.04 serving as router/firewall with iptables. Also have number of client computers in LAN. So far so good. Now what I need is some sort of interactive firewall software on ...
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1answer
897 views

Cannot ping between computers, but I can connect (only one way though)

I am new using Linux, so I would really appreciate a simple as possible answer. I cannot ping between two computers, neither to nor from. I can ssh from one computer to another, but not the other way ...
0
votes
2answers
614 views

Firewall configuration and consequences

I'm using Ubuntu 11.10. And I want to know something about firewall in Ubuntu, because I want to know if it could be the reason why my application doesn't work properly. Little background: I'have ...
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2answers
6k views

Why isn't Transmission working?

I'm using the latest version of Ubuntu and Transmission. According to Transmission, the file I am downloading has 0 peers and is idle, even though there are a few peers seeding it. Here's a batch ...
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0answers
568 views

UFW give errors and won't auto start at boot [closed]

I just tried to enable ufw on my server, it gave me this error : ERROR: problem running ufw-init When I tried the second time, it worked. When I tried to set the default rule "sudo ufw default ...
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0answers
72 views

Should I be using a firewall in Ubuntu? [duplicate]

Possible Duplicate: Why is the firewall disabled by default? I installed both gufw and Firestarter but I'm hesitant to activate one of them because I don't know too much about firewalls in ...
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2answers
1k views

How Can I Use Ubuntu As Firewall Server

Can Ubuntu be configured as a firewall server , if yes how ? , if no why ?
6
votes
1answer
316 views

Securing Riak using Shorewall Firewall

I want to set up a Riak Cluster for a Web project. However, I want to secure this cluster so that only My Web Server(s) can access Riak Cluster. Basically, I will have one or more Web Servers and 4 ...
0
votes
1answer
689 views

Blocked port 5000?

I am trying to use my Ubuntu laptop with a Heroku hosting (it's a kind of VPS hosting). Their support says my port 5000 is blocked. Any way I can check it? Does it make any sense? Is it my pc, or my ...
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1answer
863 views

Remote access my desktop through router

How can I remote access my computer desktop that is behind a router with my Android Tablet?
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0answers
330 views

does ubuntu 10 04 lts have a built in firewall and antivirus [duplicate]

Possible Duplicate: Is there a preinstalled or automatic firewall? Do I need to have 'antivirus software' installed? I have just installed ubuntu 10 04 lts on my laptop and I am ...
1
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1answer
2k views

How can I set up GUFW so that only firefox connects to the internet

I only want http, https and DNS to be open. I'm having troubles with setting up port ranges in the UFW GUI. How do I input configs into the feilds? Basically, something along the lines of this, but ...
2
votes
0answers
597 views

Is there an application firewall for Linux, like ZoneAlarm [duplicate]

Possible Duplicate: How to control internet access for each program? I've tried Firestarter and Ufw, but in the end, decided to write my own iptables scripts. I basically let http and ...
2
votes
1answer
386 views

Shorewall is breaking packets/sessions when connecting out to internet

I am happy to forward any further data if required like firewall rules etc. Would appreciate if someone can skim through my config and see if there are any glaring errors. Problem: Everything working ...
3
votes
2answers
1k views

Is there any software for bypassing the firewall?

I am using ubuntu 10.04. Is there any software to bypass the firewall configured by my network administrator. I have seen my friend using software named ultrasurf in windows which bypasses the ...
2
votes
3answers
4k views

What Firewall, anti DDOS and anti Brute-Force managers exist in Ubuntu

I have heard of ufw and of course using iptables but is there any other firewall or port manager for incoming/outgoing connections. I am also looking for GUI based ones apart from terminal ones and a ...
5
votes
2answers
289 views

Is portfowarding to my localhost on my personal Ubuntu computer secure?

After installing Lamp on my personally Ubuntu computer, I am running a application that requires to connect to the web and send SMTP mail; for example paypal needs a www address to notify successful ...
7
votes
4answers
13k views

What rules to use for UFW?

I've decided to enable the UFW that comes with Ubuntu just to make my system even more secure (especially after watching a video of a person whose computer actually got infected!), and I've enabled ...
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1answer
803 views

How to run any program but prevent it from accessing the Internet

I see a nice tutorial on the subject from 2009: http://ubuntuforums.org/showthread.php?t=1188099 But wanted something that will (more likely) work on Ubuntu 11.10. This is a flavor of an ...
2
votes
1answer
1k views

No client internet access when setting up these iptables rules

I have read many other posts but cannot figure this out. eth0 is my external connected to a Comcast modem. The server has internet access with no issues. eth1 is internal and running DHCP for the ...
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0answers
128 views

novice user…firewall [duplicate]

Possible Duplicate: Why is the firewall disabled by default? I've recently ditched windows 7 for Ubuntu 11.10 64bit... I'm a total novice and was wondering do I need to make any changes to ...
13
votes
3answers
44k views

How do I see which ports are open? [duplicate]

I am running a web server on a machine with Ubuntu 11. Everything is accessible from the local network, but not from outside. What can I do to check to make sure the appropriate ports are open? I am ...