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

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squid with ubuntu server, iptables explanation

To begin with, I'm a linux newb. I have setup a squid proxy on my home network and it is working fine. I went through couple of tutorials to get this working. My setup is: Internet->Modem->Router-My ...
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1answer
402 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
141 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
74 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
166 views

limit port access to localhost

I've written a few WebSocket servers to run locally for custom personal apps. I have no authentication since they're meant to run locally, but I need to be sure that no other system on the network ...
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13 views

Starting Firestarter on Bootup [duplicate]

I wanted to start firestarter @ beginning of my startup. So i opened "startup Application" GUI and than added Follwing Values :- Name :- Firestarter Command:- /usr/sbin/firestarter Comment:- My Super ...
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1answer
95 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
584 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
214 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
2k 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 ...
2
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1answer
79 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
788 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 ...
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1answer
2k 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
488 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
540 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
209 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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61 views

File sharing through ufw

How do i allow a shared folder through Ubuntu Uncomplicated Fire Wall in 12.04 lts 64bit so windows machines can access it? Do i need to enable ubuntu firewall for file-sharing to windows ...
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1answer
66 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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180 views

SSH only works with default port outside LAN

I have the openssh-server installed in one pc and I was connecting normally to it from outside and inside the LAN using SSH in the port 10465. However, one week ago or so, I could not connect to it ...
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107 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 ...
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439 views

Squid proxy server and outlook reception

I have a problem with the mail reception/sending with outlook where a proxy server is used in my network, and that is my configuration: Clients uses Windows and then Outlook to send and receive ...
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0answers
106 views

Express Talk SIP software issues

I am using Ubuntu 12.04 Could that be because I am not in North America(I live in Israel)? I do not use any proxy. I also tried disabling the firewall. http://imgur.com/KaWDm58 On ...
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587 views

SSH connections rejected after UFW allow 22

I am trying to setup UFW on a 12.04 server. SSH works great with UFW off. Setting root@ugvps:~# ufw enable Firewall is active and enabled on system startup root@ugvps:~# ufw status Status: active ...
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131 views

How do we allow a certain mac address in a FORWARD chain through iptables?

I set the iptables rules in default. # IPTABLES IN DEFAULT iptables -P INPUT ACCEPT iptables -P OUTPUT ACCEPT iptables -P FORWARD DROP How will allow a certain mac address in a forward chain? I ...
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0answers
750 views

IPTABLES > MAC Filtering

I am newbie. I tried DHCP Mac filtering is not enough to secure our networks and I think iptables will... This is my concept: I set a new laboratory (LAB) network. My other network is connected to a ...
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1answer
105 views

How do you install and configure TuxGuardian in Ubuntu 12.04?

Can anyone guide me on the process to install TuxGuardian in Ubuntu 12.04? Its a freeware application available at: http://tuxguardian.sourceforge.net
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324 views

UFW Firewall Rules, has a hole in it. Please help

Can someone please look at the below output for me. I have my UFW on deny/deny, and here are the rules. But if I leave my Ubuntu Server on, with a Windows XP VM, and let Instant Messenger run in the ...
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224 views

I need some help proof reading my IPtables rules, my rules seem to work but I cannot be sure

Like the title says, I need some help proof reading my iptable rules, my rules seem to work but I cannot be sure. My set up is as follows: ISP ---> cable modem ---> Ethernet switch ---> ...
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137 views

Iptables on ubuntu Ubuntu 10.04.1 not working

I am trying to block an IP address from accessing my server by using iptables, but didn't succeed. Here are the commands that I used. (after these commands, I still keep seeing 50.18.12.86 sending ...
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1answer
102 views

iptables help needed in 1304

I've setup my raring-ringtail machine and decided to use iptables after removing ufw to have more control over my network security. However, I'm stuck at one point. First, I've set default policy to ...
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1answer
2k views

Postfix is timed out while sending

I have just set up postfix (with tasksel install mail-server) with the default settings. Unfortunately, I can not send e-mails from by SMTP server. Here is my main.cf: # See ...
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0answers
223 views

New Server - apache will not serve outside LAN

New server, running well 12.04 LTS on HP ML350. Apache = great, inside our LAN. Apache = timeout, from WAN (NAT forwarded from firewall). I have cleared all Iptables, read & checked every ...
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1answer
347 views

Could someone tell me whether my OS is communicating with the internet?

I edited iptables so that when the VPN service is disconnected, no program will access the internet. Well, I did an experiment. I disconnected the VPN service manually and immediately did a ping by ...
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1answer
300 views

Change UDP port with iptables for VPN clients

What I want to do is say that for all UDP connections on interface ppp0 that have a destination port of 53, change that destination port to 1053. I am attempting to change the destination port of UDP ...
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2answers
755 views

Cannot open port

I've been struggling to open the port 5432 for remote PostgreSQL access. Which I installed on a Ubuntu 10.04 desktop machine. Here is the shell log: xybrek@ubuntu:~$ sudo ufw allow 5432 [sudo] ...
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25 views

is ninja working together with ufw?

am testing ninja and ufw together, so last weekend there seemed to be no problem. today my provider did not work any more. internet-connection was fooling around (it is paid). is ninja confusing ...
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55 views

Can not permanently clear iptable rules

I use the following commands to flush all iptable rules: sudo iptables -F sudo iptables -X sudo iptables -t nat -F sudo iptables -t nat -X sudo iptables -t mangle -F sudo iptables -t mangle -X sudo ...
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499 views

Iptables: deny all traffic from IP except for ports 80, 22222, 22223

I've got 2 servers: ClearOS external interface 192.168.1.90 internal interface 192.168.3.1 Ubuntu Server: connected to ClearOS to IP 192.168.3.90 I need to deny all traffic from IP ...
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2answers
1k views

Why is ufw logging 'BLOCK' messages regarding a port for which ufw is configured to 'ALLOW' connections?

Here's an example log message: May 25 10:36:07 myserver kernel: [7057243.392334] [UFW BLOCK] IN=eth0 OUT= MAC=00:02:55:67:82:eb:00:06:b1:3a:ef:62:08:00 SRC=69.197.128.26 DST=192.168.100.101 LEN=44 ...
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0answers
152 views

How should I configure Ubuntu firewall?

Just discovered Gufw, and I'd like to set it up. But I haven't found any documentation telling me what I should/should not allow. I'd like to be able to use it but the only documentation on the web ...
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199 views

UID based routing doesn't work

I have a 12.04 LTS server with two NICs. They are connected to different networks. # ip route list table main default via 192.168.1.254 dev eth0 192.168.1.0/24 dev eth0 proto kernel scope link ...
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992 views

How to open port 5432 for Servoy (Eclipse) PostgreSQL database server

I'm trying to install Servoy Developer on Ubuntu 12.10. I get a problem during installation with the bundled PostgreSQL database server, because the port 5432 is closed. I tried the following ...
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2answers
14k views

SSH connection refused when connecting remotly

I set up my Ubuntu server and it can connect to itself when running ssh localhost. However, when I run Putty on windows 8 I get a "connection refused" error. I have, to the best of my ability: ...
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174 views

Wifi hotspot service on Precise without disabling ufw firewall?

I've been using 12.04 LTS for a while, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports: TCP 80, 443 for web-browsing ...
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2answers
1k views

ufw firewall operation

I have always run the program UFW as my firewall in Ubuntu, and been satisifed with its performance. When I installed Ubuntu 13.04, and enabled ufw, I was not able to access the internet, and all ...
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1answer
196 views

Open ports for development purposes

I'm doing some Java ME Development in my brand-new Ubuntu laptop, coming from a now replaced Windows Vista one. What I'm trying to do is run a Mobile Simulator that acts as an HTTP Server -receives ...
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473 views

How can I open ports on ubuntu server?

Hello I am running my server and since the ip is not static (my ISP won't give me one because I need to be a commercial customer) I have to use a service like DynDNS but the site is only accessible in ...
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0answers
196 views

Configuring a firewall to drop idle connections after 30 seconds

I'm trying to reproduce a bug with gvfs that normally only happens after an hour or two. But I'm trying to make it happen after just 30 seconds so that I can work on a patch. Basically I'm trying to ...
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0answers
394 views

Configure Firewall to Take Confirmations

I want to have a firewall program for my Ubuntu 13.04 which will ask me for confirmations when a program wants to connect to the Internet. It should have options like Allow, Block etc. So is there any ...
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2answers
128 views

If I have Ubuntu installed along side Windows, does the firewall on Windows work along with the antivirus system?

I have Ubuntu installed on my Windows 7 computer. I was curious to know if the firewall on that one is activated (I have to turn it on each time I'm on the computer) along with the antivirus system, ...