A firewall is a piece of software that controls what connections can be made to and from a network.

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Open ports in Ubuntu 13.10 server

Im setting up a realtime gameserver fps-game, and then i need to configure ports. Just to mention, i will setup multiple servers for this game on the same ip address, which means i must open multiple ...
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10 views

Initiate connection and host services through firewall / nat

I have really great connectivity (1 Gbps internet connection) and a really good base to run a server. Almost every station in my office has its IP address public. I don't know why, but it was made ...
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23 views

Torrent ports and firewalls

I use this uTorrent program, under its settings 'Listening port' I set up a port of 46301, and also open that port in firewall. But whoever connects to me to leech, they connect to random ports ...
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9 views

4 broadband internet connections, 350 systems i want share internet to few systems? [on hold]

In our organization we have more than 350 systems and 5 broadband connections. Before we use separate broadband connection for each 70-80 systems in different locations but now we want to ...
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9 views

tunnel all traffic of a p2p/DHT app through proxy to an external server

I am playing with http://telehash.org/ a protocol using DHT distributed hash tables, all its traffic is sent on a certain port (42424). And I want to do this while in my workplace where a ...
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21 views

Blocking Incoming IP With Win 7 Firewall

This question was asked before, but the answer is not working for me and the rules of this forum say do not respond to answers, so I am asking again. I went through the following process on the Win 7 ...
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1answer
13 views

CentOS - ipTables

I have some questions about ipTables. Is it possible to open all ports between 2000 and 6000 and then have 2245, 5435,5434 closed? Is it possible to open some ports from a ip address? Eg. The only ...
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2answers
25 views

How to enable Remote Assistance and add an exception for it in Windows Firewall from the command line?

I need to enable Remote Assistance from the command line. The equivalent of checking this box and hitting Apply. This is for automation and I tried editing the registry entry ...
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22 views

What might be causing specific IPv6 HTTPS servers to send an excessive number of RST packets?

Client browsers on my IPv6-enabled home network hang and time out when attempting to load https:// URLs from specific IPv6 sites, such as ones operated by CloudFlare. In those situations, the live log ...
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22 views

Comodo Firewall blocks Cisco Anyconnect VPN

I am running Comodo Internet Security Firewall (6.3) and trying to connect to work using Cisco AnyConnect VPN client. I can make the connection but can't do anything else, not even ping by IP ...
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19 views

How to correctly configure iptables on a laptop?

I have run these commands (tried switching the order too) because I want to set up a firewall on my laptop so that nobody can connect to it (except of course in response to a connection I've made): ...
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32 views

FTP not accessible outside of LAN

Ok so I really need some help with this, I have XAMPP installed and am hosting a webiste with it for my friends and i to work on. I am able to see the site just fine and also i am able to get to ...
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18 views

How to force Remote Desktop via firewall rules to use LAN instead of WLAN?

WLAN has higher priorities than LAN but Remote Desktop seems to still use WLAN. I tried to achieve this by setting up a firewall rule but this does not seem to do the trick. Here is what I tried: ...
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20 views

Why can I not block certain applications on Windows 7 Firewall?

The situation is this. I open firewall.cpl in the start menu and I'm trying to block a specific application from accessing the Internet (one which wasn't present on the list, I might add--so I added ...
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15 views

port forwarding in windows

I need to forward all incoming traffic on specific port to another port on the same device "locally not proxy", and all outgoing port traffic. in Linux it is possible using iptables I used NAT chains ...
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1answer
49 views

Can a people DDOS a block Port?

The title says it all, I've search around the net but no avail. From what I understand, DDoS is a distributed denial of service attack, where multiple people sent a huge request at a same time which ...
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31 views

Windows firewall blocks internet connection for application from network share

this is my setup: Windows 7 home premium Windows firewall with inbound and outbound traffic blocked by default, file and printer sharing and some basic Windows services allowed Tinywall to control ...
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1answer
31 views

Windows firewall - block all incoming connections enable/disable - CREATE SCRIPT

Is it possible to create script which enable/disable the first checkbox of windows 7 firewall settings (Block all incoming connections....)?
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1answer
31 views

Permanently add a firewall exception on Windows 7

I'm using Windows 7 32-bits and on every start-up, a Windows security alert popup is displayed and I need to authorize the programs to access the network. If I accept the popup, the program can ...
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7 views

Programming the firewall on a Siemens router

I have a Siemens ADSL SL2-141 router. From the web interface, I can program the firewall (e.g. block/unblock IP addresses). I want to do the same programmatically via telnet. But, when I ask for ...
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1answer
29 views

IPSet with IP6Tables ERROR

Can someone please solve my headache and tell me how to fix this? [root@www ~]# ip6tables -I INPUT -m set --match-set blacklist6 src -J DROP ip6tables v1.4.7: Couldn't load match ...
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1answer
36 views

Opening a port on CentOS server not working externally?

I am trying to to setup a Ghost blog instance on port 80 of my CentOS 6 virtual server. There are no pre-installed web servers occupying port 80. If I run Ghost in production mode as a background ...
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20 views

Is it possible to restrict access to certain URLs for individual programs?

I have a certain use case where I want to whitelist a list of URLs that a certain application can access. In other words, I want to sandbox it, but don't have access to blocking or white listing those ...
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1answer
33 views

No Internet Connection on using Buffalo WHR-G300N

I have used the Buffalo WHR-G300N over 2 years while I will use it for connecting all of my devices to Internet @ home. However, two days ago, I have the issue that the router suddenly disconnected ...
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1answer
39 views

Iptables rules to only whitelist SIP providers

I have an Asterisk box sitting behind an ADSL router/modem. There are no other services on the Asterisk box, just telephony. I am getting a lot of traffic which I think are SIP probes. I've ...
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20 views

Firewall policies

I have a Juniper 5GT firewall that I use for my home server, On my home server I have an SSH server running, I am trying to access the SSH from the untrust side of the firewall, from what I believe ...
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10 views

Restricted logins + almost all ports closed : secure?

Context : I plan to travel. I want to make a little cloud with my personal server. I wish I could d/l some of my files and eventually upload some files which will not be executed and the whole is ...
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1answer
30 views

Redirect ports with iptables

I need to do redirect port 443 on all interfaces to 8080 on one interface using iptables on a box with 2 NICs. I also need to block pretty much anything else on those interfaces. Here is my iptables ...
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7 views

How to configure sSMTP with CSF?

I have a fresh installation of Debian and I just installed Config Server Firewall (CSF) and sSMTP (with Gmail as SMTP server). Does anyone know how can I tell CSF to use sSMTP when it's sending ...
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3answers
31 views

outgoing ssh fails from only one machine on lan to outside network

I have multiple servers in my LAN (which I'll refer to as Box1), and they are all able to make outgoing SSH connections, except one that stopped recently, which I'll refer to as Box2 (actually, I'm ...
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1answer
26 views

Questionable NTP Traffic at Firewall?

I checked my firewall logs and noticed odd traffic patterns for NTP or UDP/123 (shown below). I don't understand the round robin'ing that's occurring from my hosts. And I don't understand why its ...
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2answers
30 views

Windows 7 - View list of sent files (Firewall)

Is it possible to view any files that have been uploaded from the computer through the firewall? I have been using a keylogger and my AntiVirus flagged it as a virus today. I would like to know if its ...
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35 views

iptables error “FIX ME! implement getprotobyname() bionic/libc/bionic/stubs.c”

When I do this rule, the error shows up iptables -A INPUT -p tcp -m tcp -m multiport ! --dports 80,443 -j DROP I've also found some solutions. getprotobyname() just converts protocol names like tcp ...
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26 views

Firewall blocking access to cpanel admin page

a firewall is blocking access to my cpanel admin page. I get a Cpanel login box but when I enter username and password it says incorrect authentication. This has only occurred in the last 3 or 4 days ...
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44 views

Amazonaws blocked by modem?

since some time i have the following problem: I can't download a .exe file (in my case the "Minecraft.exe" file) from s3.amazonaws. It does not work on 2 laptops, which are connected with a Vodafone ...
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1answer
116 views

Bypass home router firewall [closed]

I have a roommate who is sometimes allowed to use my internet connection. When he needs access to the home network, I simply go into the router settings and remove his hostname (roommate-PC) from the ...
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1answer
24 views

Reach ssh server behind a router on embedded system using established socket connection

I have developed an embedded application running linux to do remote I/O control. The application open a socket connection to my server to communicate, periodically, the state of the I/O and getting ...
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46 views

Pinhole Conflicts

I am trying to write a simpler client server program, using my laptop as the server and several Android devices as clients. The server listens on a port (say, 5902) until a client tries to connect. ...
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1answer
55 views

Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I ...
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1answer
32 views

Windows 7 windows firewall updates error

I'm having a issue with windows firewall. I can't turn it on or off. I also can't edit it. And Windows firewall is requesting updates, but whenever I make those updates it still doesn't work. Here's ...
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53 views

Would a switch be covered by a router's firewall

So... Hopefully; this is the right place for this question. I need more Ethernet ports on my home network. Sadly, we already have an old router connected to the main router and we still need more ...
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2answers
32 views

How can I get Windows 7 firewall from being stuck in public network?

A few weeks ago, my Windows 7 Firewall switched itself from a private network to a public network. I noticed the problem when I was trying to stream a movie from my computer to my TV (as I did dozens ...
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1answer
90 views

Block All Traffic and Allow from Defined IP only in IPTABLES

I want to create a gateway firewall for my network . I want to block all the internal traffic on gateway and allow it from two computers only . On gateway --> eth0 is network card in gateway PC ...
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16 views

Wrapping a point-to-point link

I'm using a pair of IP radios (non-WiFi) to bridge my office engineering LAN (172.0.0.0/8) to a lab in another building. The radios work fine, but they expose a web management interface I'd like to ...
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14 views

How do I configure Windows Firewall to disallow inbound connections only at work, but still treat work and home as private networks otherwise?

I have a Windows 8.1 laptop that I use at home and at the office. When connected to my router at home, I want all the features associated with Windows Firewall's notion of a "private network"--that ...
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4answers
105 views

Remote into Linux workstation behind a firewall using NoMachine or other remote desktop service

My question is very similar to this question: Remote into Linux workstation behind a firewall My work has firewall and ssh server. The ssh server is listening to the default port 22. Normally I ...
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101 views

Why does NTP require bi-directional firewall access to UDP port 123?

From What are the iptables rules to permit ntp?: iptables -A INPUT -p udp --dport 123 -j ACCEPT iptables -A OUTPUT -p udp --sport 123 -j ACCEPT Also, from the NTP website: ... ntpd requires ...
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133 views

Cablemodem (SBG6580) firewall denying some outbound traffic? Why? Not configured

I finally got around to turning the syslog on for my cablemodem (Motorola Surfboard SBG6580) and I'm seeing about the expected amount of inbound attackage being blocked... 2014-05-30 21:59:02 ...
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34 views

iptables: Is it dangerous to filter by source port?

I would like to run a stateless firewall setup and I currently have the following rules: #Do not track any packet *raw :PREROUTING ACCEPT [0:0] -A PREROUTING -j NOTRACK COMMIT #Actual firewall rules ...
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1answer
82 views

Is it possible to block websites on Buffalo AirStation WCR-GN?

Is it possible to block websites on a Buffalo AirStation WCR-GN? I've gone through every menu looking for anything that might do that and I can't, so I'm guessing this device is too primitive to be ...