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

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149 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. ...
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1answer
89 views

Is it necessary to have a Firewall in Ubuntu?

I was wondering if a Firewall could give some more security, and if yes which one would you recommend.
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66 views

Allow users to access specified IPs only

I have a computer that offers both a VPN and a SSH server running three (separated) VPN networks. All users log into the server via ssh. However, I want that only certain users can communicate to ...
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1answer
91 views

Server not found problem

I've encountered an problem, maybe trivial - when I try to load this page: http://home.thep.lu.se/~torbjorn/Pythia.html I recive classic 'Server not found' page. I'm using Mozilla Firefox on Ubuntu ...
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1answer
56 views

Trace IP from MAC

I have a Virtual Server running Ubuntu at a hosting provider. In the last couble of month I have experienced a dramatic increase of inbound traffic. All of it being UDP packets. Looking in the logs ...
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1answer
382 views

ubuntu server 12.04 and ufw failure on startup, and several module not found errors

I have problem enabling ufw on startup, it works fine if I do: sudo ufw enable. But after restart puf, I've to redo it. I tried: sudo /lib/ufw/ufw-init stop ; sudo /lib/ufw/ufw-init start And ...
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1answer
214 views

Connect to mysql database on Ubuntu host from windows guest

I have Ubuntu 12.04 on my laptop and have a Windows 7 guest on (VMWare). I would like to connect to the mysql database on Ubuntu host from Windows guest.Kindly tell me how to do the same. I have tried ...
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2answers
48 views

Can removing GUFW create dangers for my system? [duplicate]

I learned that the firewall settings for 12.04 were by default disabled so I went to the software center and downloaded and enabled the GUFW firewall gui config. I thought having a firewall would be a ...
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2answers
1k views

Why can't I connect to SSH server from Ubuntu client? (while windows client is okay)

I have configured an ssh server on a Ubuntu 12.04 LTS machine. I changed the listening port to the one different from the default port 22 (that's the only change I made on the server). I am trying to ...
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2answers
149 views

UFW and firewall

So I recently installed ubuntu and I have been working with it no problem.While browsing through the security guides (specifically: https://wiki.ubuntu.com/BasicSecurity) I noticed this: "enable the ...
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1answer
25 views

Importing GUFW rules?

Is there an easy way to import ready rules for uncomplicated firewall? like ready in and out rules with IPs and everything.
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1answer
94 views

OpenBSD Packet Filter firewall in Ubuntu

Is there a way to use OpenBSD's Packet Filter firewall in Ubuntu?
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58 views

Telnet timing out on port 22 and port 23

Hello all So here is what I've done so far... I have turned off my firewall TEMPORALLY on both client and server, so does my router. My router has port forwarding on both ports 22 and 23 pointing to ...
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1answer
294 views

Are my ports opened?

Im using virtual server on hosting. There is Ubuntu 12.04 LTS. Im building pool websites, and stratum mining. I can connect to stratum on port 3333 via minerd on server, but cant connect from outside ...
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1answer
181 views

I can not connect on ubutu service port 3050, from my network

I have the Firebird service running on my ubuntu server and it is working fine inside the server. But when I try to use from another machine it does not work. Like a firewall issue. I did make some ...
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1answer
26 views

Unresolved error with browsing a website : Error 404

I am running on Ubuntu 13.04 64amd. I cannot access the website which I built online through all my browsers. It redirect to the server and it says the Error 404. I asked from the server (Through ...
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1answer
76 views

Ubuntu VPS > restrict openerp for some user

In Ubuntu VPS server, openerp is running and anyone can using this web interface. my vps server is: http:// <Public IP>:8069/. I want to allow some mac addresses and restrict to all. Here is ...
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1answer
102 views

How to allow SSH from internet when it is forwarded to a non-standard port

I'm configuring a virtual firewall using Shorewall and have a rule to forward the external port 2222 to internal port 22: DNAT inet lan:192.168.1.2:22 tcp 2222 where 192.168.1.2 is the ...
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0answers
176 views

Manually turn off firewall/unblock ssh port

Ubuntu Server 12.10 Last night I was messing with ufw, so I can enable some ports on the machine. Little did I know I just blocked port 22. Hours later closing PuTTy, I tried to connect to the server ...
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61 views

Remote ACCESS - SSH listening port filtered out by Firewall?

I am trying to access a remote server, with no physical access. I have accidentally changed the previous listening port in SSH and forgot to change it in the firewall rules. In firewall 15000 is ...
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0answers
61 views

Configuring a strictly local dns server for local network media streaming

I am fairly new to Linux, but I have an Ubuntu media server set up in my house. We can't afford to have an internet connection, so I move the server back and forth occasionally when I need to run ...
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0answers
100 views

how to proxy to a VPN connected server with local services running?

I'm having trouble accessing services that are running on my Linux Box from outside the local network. The setup is not as simple as most tutorials describe so I'm a bit stuck. My Linux Box (running ...
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0answers
43 views

UFW problem : can not access certain pages

Hello, I configured iptables using ufw to deny traffic from and to anywhere except my chosen ports. This is my /lib/ufw/user.rules : *filter :ufw-user-input - [0:0] :ufw-user-output - [0:0] ...
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1answer
31 views

Trouble saving iptables

I am having some issues with removing an iptable entry I have entered. I added -A PREROUTING -d 95.211.213.149/32 -i venet0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 1194 To experiment ...
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0answers
250 views

Squid proxy and firewall blocking HTTP requests

I have 3 virtual machines. One functions as a router. A HTTP server is installed on another machine. The third has to connect to the server via the router. I have installed a web proxy(Squid3) on the ...
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1answer
505 views

Open source stun turn server which can do hole punch is there similar packages?

Is there any open source stun/turn server which can do hole punch like numb for Ubuntu ? Numb is a STUN/TURN server. Description A STUN/TURN server is used for NAT traversal in VoIP. ...
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1answer
3k views

Where are iptables's rulesets stored on Ubuntu 12.04?

Ubuntu 12.04 LTS - iptables v1.4.12 TLDR: Where are iptables's rulesets saved when invoking iptables-save <ruleset-name> ? Explanation: According to this answer basic way of saving ...
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1answer
150 views

Apache timeout, OK on localhost

I have been staring at this for 2 hours now and can't figure it out. My webserver was running fine until earlier today. But now it can't be accessed from the Internet. The server is apache2, but ...
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0answers
229 views

Foraward Traffic from local machine to proxy server using iptables

I am using Ubuntu Server 12.04. My IP is 192.168.4.160. I want to route the HTTP traffic generated locally from my system destined to a particular URL (say x.x.x.x) to pass through proxy server. My ...
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0answers
146 views

UFW blocking random packets on 443

All, I have UFW setup to allow traffic on port 443. It works as expected, though I have a large amount of UFW Block log entries. To Action From -- ...
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0answers
32 views

Too Many unsolicited “Incoming Connections”

With the ufw rule "deny incoming", ufw logs as many as 2 to 3 block packets from random IPs on random ports. I find it quite irritating. I was just wondering if this is normal "midirected" internet ...
0
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1answer
526 views

Can't delete an iptables chain

I'm having a problem on deleting a user-defined chain. these the are rules I entered. sudo iptables -t mangle -N internet sudo iptables -t mangle -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j ...
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1answer
53 views

after software update, website not accessible

I just applied a bunch of recommended updates this morning (which seems to have upgraded the kernel to 3.8.0-32.47), and suddenly I cannot connect to the machine on port 80 (http) or 22 (ssh). Ping ...
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844 views

Ubuntu 12.04 LTS - vsftpd problem. No connection. Connection refused

i have a problem with vsftpd server running on Ubuntu 12.04 LTS. Here is the configuration: ubuntu Server address - 192.168.5.100 router address - 192.168.5.1 roger/# grep -v "#" /etc/vsftpd.conf ...
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0answers
64 views

Beginner Help Configuring Iptables

I have just started to configure iptables and I am wondering what basic rules you would recommend that I use for the things that I need. Here is what I am doing: I want my default policies for ...
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0answers
137 views

I have UFW block messages from local network machines, how can I analyse if they are malicious?

I'm getting a lot of messages in my UFW log, and I'm trying to figure out if these are malicious or just normal. A UDP broadcast is coming from a windows laptop x.x.x.191, and some from our synology ...
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0answers
115 views

found someone lurking in my LAN, not sure what to do next

I have DD WRT router with internal numbers all falling within 192.168.1.0/24. I was looking on my firewall records this morning and found someone at 10.10.109.100 got blocked from accessing port 5353 ...
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36 views

How is IP getting autobanned by Ubuntu?

I have an ubuntu server running postfix/dovecot and shorewall firewall. Every so often I see in the logs that external IP address are getting banned but I can not figure out where or how this is ...
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193 views

Configure Firewall to use SSH Tunnel Through Port 80

I am having some issues configuring iptables to use SSH Tunneling through port 80. Here are my iptables rules. :INPUT DROP :FORWARD DROP :OUTPUT DROP -A INPUT -m state --state RELATED,ESTABLISHED -j ...
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0answers
135 views

ubuntu server apf-firewall configuration

I have not used the apf-firewall before and I'm having trouble configuring it. I have already try setting the iptables but it fails to start, so what more do I need to do? thank you
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0answers
52 views

Help Configuring Iptables Rules

So I am accessing my server remotely using PuTTy. I am using port 80 for SSH because port 22 is blocked at my school. I successfully configured Iptables to accept port 80 and I dropped all other ...
4
votes
1answer
822 views

Ban IP by country in UFW

I want to block a country in my server, but I don't know which rule I must use in UFW (or iptables). For example, people from US and other countries can see the site, but visitors from Russia can't. ...
0
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1answer
254 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 ...
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0answers
488 views

Bypass proxy in Ubuntu

In my hostel there is Cyberoam firewall. Therefor I am unable to access Facebook. I searched also and tried using jellyshell but it takes too much time. Is there any option using tor or vpn? Tor ...
0
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1answer
314 views

What's the difference between -p tcp and -m tcp in iptables?

I just noticed an entry in /etc/sysconfig/iptables along the lines of -A INPUT -p tcp -m tcp --dport 138 -j DROP I am not so sure why there has to be two switches here for matching protocol TCP, ...
0
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1answer
4k views

How can I allow ssh connection from an IP subnet on port 10022 using iptables?

I need to set up a server with public IP for bandwidth testing, and I already have a script to drop all incoming traffic except for the ports I need. I have changed the ssh port from default (22) to ...
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2answers
680 views

Ubuntu - apt-get not working behind restricted internet access

I have Ubuntu 12.04 64-bit boxes running in a company but they have internet browsing and firewalls for security. When I do apt-get update or install it fails. But I have a remote server which ip is ...
0
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1answer
81 views

No matter what I researched and did I can't connect to my MySQL server

Ubuntu installed MySQL for me through LAMP. When I connect with SSH I can login with the root user but not the user i created myself. When I use HeidiSQL I can't login with anything. I ran these ...
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1answer
275 views

Understanding Iptables

iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 7000:7010 -j ACCEPT I trying to understand the -m state --state NEW part. Searching through the man pages and correct me if I am wrong ...
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45 views

Can a weak Ubuntu user password be a risk for ONLINE security?

Can anyone gain an unauthorized remote access to my Ubuntu machine? Does having a strong user password really helps prevent this? Or firewall just doesn't let anyone in by default, regardless of the ...