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

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the packet flow from a network interface to a local process? help!

I'm read Linux Iptables Pocket Reference. So I do not understand the figures presented. It says that packets travel through chains, and are presented to the rules one at a time and in order. Then ...
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18 views

'iptables -a' just hangs and never returns? [on hold]

I'd like to redirect requests in on port 80 to a service I already have running on port 8443. I swear I've used this command before on other systems and it's worked: sudo iptables -A PREROUTING -t ...
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25 views

Configure Ubuntu 14.04.3 firewall for NAS TS-453A

With Qfinder I can manage my QNAP TS-453A from my Ubuntu 14.04.3 LTS laptop, only when the firewall in Ubuntu is disabled. As soon as the firewall is active, Qfinder and the NAS stop both and are not ...
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1answer
34 views

Ubuntu as a router for Video conference purpose [on hold]

my setup: Ubuntu 12.04 eth0 192.168.10.17 eth1 10.10.1.27 video conference mcu 192.168.10.52 configuration done: net.ipv4.ip_forward=1 oot@its-PRODiiGY-G31:~# ...
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12 views

Recover Server from recovery mode(firewall closes ports)

My server( Ubuntu 14.04 - Plesk - RAID1 ) is now in normal mode. Almost all ports disabled by firewall as plesk port 8443, so plesk login panel is not opening. Also Website is not opening. ...
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1answer
41 views

How do I secure my Ubuntu? [on hold]

I am not pleased with the Ubuntu operating system. I was told by many "gurus" that Linux across the board was completely secure. Since I installed Ubuntu, which as an OS is great, I have set up ...
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16 views

apt-key add <file>; apt-get … keyserver timeout on same key

I'm behind a firewall (i have the proxy setup - just like in Why does add-apt-repository now fail to retrieve keys behind my proxy server, but I can update package lists and manually receive the ...
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25 views

Traffic control using TC/IPtables mangle [closed]

I want to control TCP Packets/KBits and/or Kbps traffic coming to port 7171 per minute. I am a new Linux user, I host a game-server on Ubuntu 14.04 Can someone help me, please? I have been looking for ...
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22 views

TCP/UDP Packets Ubuntu 14.04

I am hosting a game-server on ubuntu 14.04 Can I control the UDP/TCP Packets per minute/second on port 7171? Players use a lot of packets to lag/crash my game-server and when it reach the maximum ...
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8 views

Output SSH in shorewall

I can not use ssh or scp where has installed shorewall, returns me the message: ssh: connect to host xxx Connection refused Which should add a rule to enable this feature?
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20 views

IPTables forward port to another ip:port but keeping original source ip

I have following iptables rules on gateway machine(192.168.0.1). I want to forward port 192.168.0.1:80 to 192.168.0.2:8080. But I need to maintain original source ip so that original server can get ...
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12 views

Firewall not starting on system startup

I have enable firewall using sudo ufw enable. But when i restart system, it is getting disabled. I checked /etc/ufw/ufw.conf and it has ENABLED=yes. Here is system config $ uname -a Linux master ...
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7 views

How can i configure a rule that using squid3 for AVG update proxy base on an external firewall?

I'm using Ubuntu Desktop 14.04.3. The firewall i'm using is here http://gufw.org/. I've set up squid3 with a specific port. Now i want to configure the firewall rule to allow only AVG antivirus ...
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12 views

Block HTTPS site

Can anyone recommend an effective tool to block some https websites with ubuntu server? I want to use the server as a gateway for the users. A detailed guide would be highly appreciated. Thanks
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23 views

Block anything from NO-IP source

i have problem in my server there is to much load in my server and all process is 100% and at last server go down the only strange thing i can see there is to much request from no-ip how can i block ...
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34 views

UFW ACCEPT Problem

I'm having problem with UFW. If i block like whole /24 network becouse lots of bruteforcing etc. coming from China / Korea or somewhere. They still get to open ports. If i have, lets say port 443 ...
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1answer
39 views

Unable to connect to mongo on remote server

I have installed mongo on machine1(Ubuntu 14.04.3 LTS server) in my local network. I have also opened the port 27017 as mentioned in this guide using following commands: sudo iptables -A INPUT -p tcp ...
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1answer
15 views

Unable to add firewall rule “Duplicate Profile”

I'm unable to add new rules to my firewall using ufw gui. In the Log I get the following error. [19/01/16 14:16:43] Error running: /usr/sbin/ufw allow in from any to any port 8000 > WARN: ...
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1answer
29 views

OpenVPN Configuration with ufw eth0 doesn't exist to add it in before.rules

in this guide I am asked to edit /etc/ufw/before.rules and add: # START OPENVPN RULES # NAT table rules *nat :POSTROUTING ACCEPT [0:0] # Allow traffic from OpenVPN client to eth0 -A POSTROUTING -s ...
1
vote
1answer
36 views

ufw is enable but still be able to surfing web

I enabled ufw as a security practice. And let the default setting intact. I noticed that I still be able to access internet using web browser, so I tested the firewall with transmission. Transmission ...
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1answer
43 views

How does ufw filter traffic?

I enabled ufw firewall with the following command: $ sudo ufw enable Firewall is active and enabled on system startup $ Now while I look at the status: $ sudo ufw status verbose Status: active ...
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1answer
25 views

Would active connections cause this UFW Block?

I'm running ubuntu 14.04 as a gateway, routing is controlled by iptables. I'm getting a number of strange blocks in UFW which seem to effect established connections. Is there any way this block would ...
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53 views

Server setup problems, am I missing something obvious?

So I've set up Ubuntu 14.04 as a LAMP. I've got it set up to do three things so far, all work fine over LAN. 1) Network printing. 2) Host a small webpage. 3) Act as a minecraft server. I've ran a ...
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1answer
38 views

Do I need iptables if only two ports are open to the public?

For a special task I have a root server running Linux Ubuntu 14.04. The server has a very minimalistic installation with ssh on a non-standard port and no root access. Basically the servers primary ...
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20 views

Unable to recieve UDP packets

I have a program which sends UDP packets to a specific port (eg: 53023) at localhost. I have written another program using Qt 4.8 which tries to receive the packets from this port at localhost. ...
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1answer
29 views

Telnet and Firewall [closed]

I would like to transfer file from one machine to another using telnet. When I tried to connect the two computers by telnet, using the same network, the file was sent correctly and everything was ...
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56 views

UFW is not logging (port scan with nmap)

This is the output of sudo ufw status verbose: Status: active Logging: on (low) Default: deny (incoming), deny (outgoing) New profiles: skip To Action From -- ...
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2answers
36 views

Do I need iptables or ufw if I have gufw?

On my Ubuntu computer I have Iptables,ufw and gufw installed on it but I am trying to figure out if I need to remove one so I did a experiment and removed iptables and I saw ufw and gufw was removed ...
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36 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 ...
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57 views

Wildfly on Ubuntu HTTPS on port 8443 timeout

I have a web application (Java EE) which was running on a Windows server without any problem. Also on my local machine (Mac OS) everything runs smoothly. Now I had to replace the remote Windows server ...
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2answers
67 views

cannot telnet into ubuntu from windows 7

I have a php server running on port 4444 on my Ubuntu 15.04 machine. Now when I execute telnet 127.0.0.1 4444 it works fine. Now I have connected my machine and a windows 7 machine using mobile ...
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57 views

UFW is blocking “gvfsd-smb-browse” on changing ports

I have a problem connecting to the samba shares between two of my computers. One is a Laptop and the other a Destop-PC, both running Ubuntu-Gnome 15.10. It changes from which Computer I can connect to ...
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26 views

Allowing sshd on local network without access to internet

I have setup sshd on my server and can access it fine from both my local network and remotely from other networks. I set up port forwarding using a different port than port 22. Port forwarding is ...
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1answer
20 views

VSFTPD not letting me login

Any one come across this before, Other then the settings below everything is default. This seems to work on my local machine but not on a VPS local_enable=YES write_enable=YES anonymous_enable=NO ...
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37 views

Vagrant NFS folders + Firewall rules

I am trying to configure the firewall -via the GUI tool- on 14.04 by adding rules to allow NFS folder sharing with my vagrant box. However this only works when the firewall is disabled as on vagrant ...
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2answers
197 views

How to configure UFW to allow ntp to work?

I've enabled UFW on one of production servers with configuration: Default: deny (incoming), deny (outgoing). For NTP synchronization, I've installed ntp and it's currently running. Can someone advise ...
2
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0answers
20 views

xrdb to Ubuntu machine not working from external network

I have a Ubuntu machine that I would like external users to connect to using RDP. Connecting from an internal network works perfectly fine. But users outside of my network,who use the public IP, can ...
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0answers
18 views

How to notify administrator with mail in case ubuntu firewall stops

Is there a notification application to warn administrator in case Ubuntu firewall stop accidentally ? Thank you.
3
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1answer
49 views

configure iptables to redirect traffic to a specific IP address

I have just began using iptables. I have a server with a public ip address (A.A.A.A) wich is hosting a Virtual Machine (B.B.B.B) on local network. I want to redirect all inbound traffic on the port ...
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31 views

domain not forwarding via dnsmasq

I'm using : Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty And Dnsmasq version 2.68 Copyright (c) 2000-2013 Simon ...
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21 views

Firewall zone not changing when activating VPN

How can I make the Firewall zone change automatically at VPN connect? I have set up Firewall with firewalld and firewall-config GUI. There is many preset zones, in which "home" has all ...
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22 views

Disable USB Port & Website Block/Allow

I want to lock USB Mass Storage (Pendrives & External HDD), Mobile Storage Access on my Ubuntu 14.04 LTS Desktop Version. Simply, I need only use of USB Keyboard & Mouse, no Other USB Devices. ...
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33 views

why can vsftpd by passive mode work with firewall allowing only 21 port?

I have a question. Why can vsftpd by passive mode work with firewall allowing only 21 port ? I open only 21/tcp port. $ ufw enable $ ufw allow 21/tcp $ cat /etc/vsftpd.conf | grep pasv ...
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1answer
37 views

How to resolve multiple hosts inside a NAT firewall

My apologies if this has been asked before, but I can't seem to find a complete solution. I have a hosted sub-domain at no-ip.com with a wildcard DNS option enabled. On my end I have a firewall ...
0
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0answers
30 views

cannot load ipp2p

i've tried to install the xtables-common-addon but when i try to load the ipp2p rules to firewall, iptables doesn't seem to understand the commands. It returns an error. do you know a workaround ...
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1answer
59 views

iptables block port from local network

I have a problem inside my infrastructure. chat.example.com port 8185 is reachable outside my infrastructure with a port fowarding to the right box. But inside my infrastructure, i'm not able to reach ...
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25 views

Configure Leopard Flower (LPFW) to start at boot

I have just downloaded LPFW from here: https://github.com/themighty1/lpfw. Everytime I acces my computer I have to run sudo ./lpfw and start the GUI executing gui/gui.py to run the program. Is there ...
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0answers
67 views

What's the purpose of economy.canonical.com?

I noticed that in one of my server's /var/log/ufw.log this morning that the firewall had blocked the IP address 91.189.91.23 from accessing port 80. This occurred 9 times within about a minute and a ...
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2answers
41 views

How to check this port?

i'm on ubutun 12.04LTS and this error appeared ChannelException: Failed to bind to: 0.0.0.0/0.0.0.0:6702 need help to check where is the problem ? can i check if the port are busy or closed ? ...
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2answers
459 views

After 15.10 update, I can't play Minecraft or FTB

I have been able to play Minecraft fine earlier, with Xubuntu 15.4. Yesterday when I updated to 15.10 I am unable to play online. Here is the launch log. I have tried reinstalling both Minecraft ...