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

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4
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1answer
3k views

Which port does Ubuntu Software Center use?

I have installed the gufw firewall utility and want to make a whitelist of ports (want maximum security, but whitelisting single IPs is currently too tedious). I have so far only entered ports 53 (for ...
3
votes
2answers
2k 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
1answer
120 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 ...
2
votes
1answer
287 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 ...
2
votes
5answers
978 views

Blocking Remote Login

Last night, I was shutting down my server and I saw a message asking if I wanted to shut down a "pts/0" session. Odd, I thought. So I logged back in and did a finger and saw that there was someone ...
1
vote
1answer
2k views

how do I enable firewall zones for NetworkManager

I am trying to use the default network manager for ubuntu 13.10 to connect to networks. Despite any config changes for example, enabling UFW, does not allow for the changing of this profile scheme. ...
1
vote
1answer
306 views

How does ufw handle conflicting rules?

I recently had the following conflicting rules on ufw 445/tcp ALLOW 192.168.1.0/24 445 DENY anywhere 445 DENY anywhere IPV6 ...
1
vote
1answer
3k 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 ...
0
votes
2answers
37 views

Why does Ubuntu comes with two firewalls by default?

I just realised Ubuntu comes with two firewalls by default iptables and ufw. But why? I mean running more than one software firewall on one computer can be insecure, that's what they say. I don't ...
0
votes
1answer
336 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
1k views

UFW, allow from wlan to eth

I would like to use my ubuntu 12.04 notebook as a wifi hotsport to my smatphone. Everything is going ok, using dnsmasq and hostapd and allowing ports 68 and 53 on UFW. But to access the web the UFW ...
0
votes
2answers
2k views

Problems allowing outgoing multicast in ufw

I am having problems configuring the uncomplicated firewall (ufw) to allow outgoing multicast traffic. I am blocking all in and outgoing connections as the default policy. I have supplemented with the ...
0
votes
1answer
745 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 ...