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

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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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1k 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
447 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
66 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
4k 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
316 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
54 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
242 views

OpenBSD Packet Filter firewall in Ubuntu

Is there a way to use OpenBSD's Packet Filter firewall in Ubuntu?
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0answers
97 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
683 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
870 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
30 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
130 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
133 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
616 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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1answer
237 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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1answer
49 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
363 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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2answers
2k 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
11k 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
227 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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1answer
1k 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
70 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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2k 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
133 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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158 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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1answer
2k 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. ...
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1answer
679 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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1answer
645 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, ...
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1answer
7k 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
1k 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 ...
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1answer
94 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
377 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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61 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 ...
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6answers
2k views

Do I need a firewall for my desktop?

I don't have a router, but I mostly use my desktop for online shopping and torrenting. So, do I have to enable the firewall? I hope not, because I'm really dumb and I don't think I will be able to ...
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1answer
727 views

Ubuntu Firewall: Apache only visible on lan

How can I add a rule to the Ubuntu firewall that makes Apache server only accessible from the internal LAN? ufw status ng@ng-laptop-kv:~$ sudo ufw status Estado: activo Hasta ...
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1answer
186 views

having problem with squidGuard. Need help [duplicate]

when i write down this command on my terminal for configuring squidguard squidGuard -d this error shows up squidGuard: error while loading shared libraries: libdb-4.6.so: cannot open shared object ...
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1answer
160 views

Issues with shorewall

I'm new to using Ubuntu OS and its interface and using terminal. Recently I was trying to deploy squid, and shorewall firewall. Even though shorewall is running I can't get through one command, i.e. ...
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1answer
130 views

iptables forwarding rule

I entered the following rule into my iptables: sudo iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-ports 1337 and then when I went to remove it, I couldn't find it ...
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1answer
1k views

Connecting to NAT virtualbox guest from bridged network

I've setup a Virtualbox Ubuntu 12.04 server using Vagrant. I can ssh to it and even ping my desktop from it. What doesn't work is to ping the guest OS from my desktop. I've tried to flush the ...
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1answer
378 views

UPNP - How to configure GUFW

I have a TP-LINK TD-W8968 router with a mediaserver (UPNP/DLNA) port. The port has a USB stick with media content. I can access this content via XBMC and Totem/Movie player without any hassle. But ...
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2answers
3k views

How to block all but one or two websites without browser extensions? [duplicate]

I want to block all, but one or two websites. This question is therefore relatively close to, but different from the following Parental controls with different settings for different users ...
3
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1answer
132 views

UFW python documentation

I'm trying to access ufw with python, but on line 53 of backend.py, they raise a weird error that makes no sense: Traceback (most recent call last): File "mymodule.py", line 1467, in ...
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1answer
2k views

How to make ubuntu gateway?

i am new on Ubuntu. i want to make a gateway. i have some 25 systems and switch but i don't have any server. i want to setup a system as a gateway system and want to make a firewall. i want that ...
2
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1answer
4k views

Apache (and other services) work on localhost, but not IP address

My Apache server is working correctly on port 80. When I try to enable SSL on port 443, I can connect via localhost (telnet localhost 443) but not via IP address (telnet xxx.xxx.xxx.xxx 443). To ...
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1answer
731 views

Why ufw is blocking my outgoing traffic?

Here is my status: $ sudo ufw status verbose Status: active Logging: on (medium) Default: deny (incoming), allow (outgoing) New profiles: skip To Action From -- ...
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1answer
873 views

How to configure a firewall that only allows a few webpages and dropbox and U1 services?

Can anyone give a step-by-step how-to that explains how to block all outgoing internet traffic to all websites, but allows only a selected list (needed for working, fi. online dictionaries) allows ...
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1answer
289 views

Screen Sharing Behind Firewall

I've setup my brother's computer with Ubuntu. I would like to be able to control his screen with his permission, to configure and instruct him when needed. However, he is on a provide IP provided by ...
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1answer
124 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 ...
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114 views

Help with ssh between machines on local network [duplicate]

I have two machines on my local network (both with Ubuntu 10.04) and I want to ssh (and rsync) between them. The two machines have fixed IPs 192.168.0.15 and ...17 Both computers frequently ssh ...