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

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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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29 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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50 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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32 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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27 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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36 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
275 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
39 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
73 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 ...
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1answer
52 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
62 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
45 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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93 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
58 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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32 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. ...
2
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1answer
43 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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93 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
60 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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2answers
42 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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183 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
132 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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120 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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39 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
42 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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91 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
597 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 ...
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29 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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19 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
77 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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47 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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23 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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48 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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57 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
53 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 ...
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63 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
89 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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66 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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109 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
51 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
949 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 ...
4
votes
1answer
41 views

Is there an iteractive firewall extension available for Ubuntu?

Every time something on my computer tries to contact an external host or an external host tries to contact my computer I would like to be asked if I authorize this and if I would like to create a rule ...
0
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1answer
65 views

Iptables firewall rules not restoring on server restart [duplicate]

I am setting up iptables on a new instance of Ubuntu 14.04 server. So far I have: put iptables rules into a file /etc/iptables.firewall.rules created a script ...
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1answer
273 views

LXD container refusing connections from the host

I'm pretty new to LXD having recently discovered it. I'm making progress with the basic interactions with images and containers - it looks promising. Currently I am stuck on a problem connecting ...
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0answers
20 views

Network crashed?

So I have a server from ovh. When I was messing with the network I went to flush iptables and reload the network, and well it crashed all of the ports. So I thought I just need to reboot the server, ...
0
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1answer
114 views

Can't ping my IP address

I cant ping my own IP address for my machine running Ubuntu. I have tried to ping the machine with an external VPS but I still have had no luck. I have opened port 80 (TCP) even though I don't think ...
0
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1answer
66 views

Soap server port not visible to client

My soap server running on port 44485. Following is the netstat command output after start the server. $ netstat -ant | grep 44485 tcp 0 0 0.0.0.0:44485 0.0.0.0:* ...
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1answer
250 views

Enabling Conntrack for iptables to work on openvz container?

I'm trying to use iptables on my newly purchased openvz container. Everything was going well until I noticed that apt-get wasn't working, looking round I discovered some tutorials which said that ...
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25 views

How can I access my BitTorrent Transmission over Web from another computer which is not on my network?

I am using Ubuntu 14.04 with BitTorrent transmission 2.82. I had already allowed the Remote Access with Default Port 9091 and username and password in the settings of Trasmission. Only from these IP ...
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326 views

How can I configure my firewall (iptables) to allow Counter-Strike: Global Offensive to connect to the local Steam Client process?

When my firewalls (iptables) are enabled Counter-Strike: Global Offensive fails to launch with the following error when starting csgo: FATAL ERROR: Failed to connect with local Steam Client process! ...
0
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1answer
38 views

Firewall config

I am trying to see if it's possible and what commands need to be done. I am trying to block all outbound traffic to a specific ip on my local network. The back story is I am using plex and I don't ...