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

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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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1answer
35 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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0answers
19 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
17 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
23 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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1answer
22 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
25 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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0answers
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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0answers
12 views

IPSet with IP6Tables ERROR

Can someone please solve my headache and tell me how to fix this? [root@www xtables]# ip6tables -I INPUT -m set --match-set blacklist6 src -J DROP ip6tables v1.4.7: Couldn't load match ...
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1answer
4k views

How to setup firewall to allow internet connection sharing via Wifi USB stick?

I have a Windows8 computer linked to the internet via an ethernet cable ("Ethernet" network connection). I have attached to it a DLink Wifi USB stick, and I'm trying to share the main PC's internet ...
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0answers
16 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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6answers
5k views

Does the Virtual PC XP Mode need safety measures?

Does the Virtual PC XP-Mode (or any other virtualized mode) require safety measures, such as antivirus or a firewall? I'm just wondering if the XP-Mode would be a large security loophole, since it's ...
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1answer
2k views

Windows 2008 Firewall - How do I restrict HTTP inbound to specific IP?

My goal is to restrict all HTTP inbound requests to a specific IP addresses. I thought it would be a simple process - but I am not getting the result desired I have modified a predefined rule called ...
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2answers
1k views

Unable to connect to Adobe Connect

I am having troubles trying to connect my colleges Adobe Connect. I have done the test meeting connection and it will say "Unable to connect". I have tried connecting on 3 other computers and it works ...
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1answer
27 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 ...
0
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1answer
25 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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1answer
237 views

website blocked by netgear firewall

I have a Netgear DGN10000 supplied by Virgin Media in the UK. It is running the latest firmware (V2.1.00.25_VG). For some reason it appears to be blocking all URLs which contain "microsoft.com" ...
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2answers
2k views

Can't start firewall or automatic updates in Windows XP

On a friends laptop following some viruses infestations there is a problem in starting the Windows firewall. The error is: Could not start the Windows Firewall/Internet Connection Sharing(ICS) ...
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1answer
83 views

Configure application integration with ufw firewall

I've read the ubuntu developer docs regarding the ufw here, but couldn't find what I was looking for. It allows me to set rules for controlling in/out traffic based on source IP or port numbers, but ...
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1answer
86 views

mac osx littlesnitch blocking outgoing connections from ssh remote login

I have setup remote ssh access on the rush in my development computer (OSX 10.6.8) before leaving my home for holiday yesterday. It is correctly setup, and I can access it via SSH, logging is as root ...
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1answer
9 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 ...
0
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1answer
19 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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3answers
1k views

Parental control or outbound firewall?

Based on the Age distribution of Stack Overflow users some of you might also have kids in the ages when certain images can be very disturbing. An age when they cannot yet decide by themselves what ...
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1answer
4k views

Mikrotik Firewall rule: block all connection except to VPN server

As the title says I need to block all the connection to mikrotik router from outside except connection to VPN server. Then allow Remote desktop to LAN's system over VPN(either L2TP/IPSec or PPTP) from ...
0
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1answer
87 views

Should fwknop be listening to a port?

I am trying to install fwknop on a VirtualBox Debian 7 machine. It installs with no error (apt-get install fwknop-server -y), i made the modification in /etc/default/fwknop-server file so daemon ...
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1answer
629 views

How to listen to all ports (udp and tcp) or make them all appear open in Debian

I got an external Debian server. The problem is that my university campus doesn't allow connections to go outside when the port is different than TCP port 22, 80, 443, or UDP port 123. I tested them ...
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0answers
4 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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1answer
2k views

UDP blocked by Windows XP Firewall when sending to local machine

I work for a software development company but the issue doesn't seem to be programming-related. Here is my setup: Windows XP Professional with Service Pack 3, all updated Program that sends UDP ...
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2answers
747 views

Firestarter device not ready when booting Ubuntu

I am trying to get firestarter running on Ubuntu 11.10 and I am getting an error: Failed to start Firewall The device eth1 is not ready. Please check your network device settings and make sure ...
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3answers
29 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 ...
46
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7answers
22k views

Why does the Mac OS X firewall dialog recurringly pop-up and disappear by itself (without letting me respond) under Snow Leopard?

From time to time, I'll be on my Macbook using a program that accesses the network – whether Firefox, or Sony's Reader Library – really, it seems like it could happen with any program that ...
3
votes
1answer
2k views

Allow access from outside network with dmz and iptables

I'm having a problem with my home network. So my setup is like this: In my Router (using Ubuntu desktop v11.04), I installed squid proxy as my transparent proxy. So I would like to use dyndns ...
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1answer
2k views

How to allow Dropbox to auto-update by adding an exception to ESET firewall?

I am using ESET Smart Security v5.2.9.1 and Dropbox at Windows 7 x64. The problem that I am facing is that every time Dropbox wants to auto-update, it downloads an updater file that has different ...
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1answer
25 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
2k views

How to access NodeJS server on LAN?

I'm not the most knowledgeable guy ever with networking, but here goes... I've created an application with NodeJS and I'd like to test the application on my LAN with my family. The application ...
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2answers
29 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 ...
0
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0answers
91 views

java is listening from :::0 Causing firewall dialog that appears then disappears

Every 3 hours or so on my mac, a firewall dialog appears and disappears almost instantly. It lasts long enough to be annoying, but not long enough to read it. When it happens, I check appfirewall.log ...
0
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2answers
585 views

Windows 8.1 update service error code: 80240438

I updated to Win 8.1 recently and I've got this issue. In windows firewall I block all inbound connections and all outbound connections that do not match a firewall rule. I create a custom firewall ...
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2answers
1k views

Deny access to a port from localhost on OSX

I want to test a fallback strategy for my memcached driver (in case port is protected by firewall). How can I deny access to a specific port, on 127.0.0.1?
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0answers
21 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 ...
4
votes
2answers
2k views

Cannot connect to my mac via SSH

I want to open a connection to my mac (10.8) via SSH. An SSH-server is installed by default on OSX. Remote login is enabled, so the service is running and I can connect to to localhost via ssh. ...
0
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1answer
72 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 ...
0
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0answers
20 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 ...
0
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0answers
36 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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votes
1answer
90 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 ...
0
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1answer
3k views

How to open up firewall for incoming Remote Desktop connections in Win 7?

How do you open the Win 7 Firewall for incoming Remote Desktop connections? I get this message in System Properties:
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1answer
21 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 ...
0
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1answer
2k views

How to open a port for all users: NSA 2400

I'm trying to open up port 8332 for all users behind my firewall but can only find instructions for doing so for a single IP address. How do I make sure all my users can use a specific port? I've ...
0
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1answer
10k views

How to open a specific port in Moutain Lion Firewall

I cant seem to find how to open a specific port in the ML firewall? I know you can give applications permisiion, but thats no good to me. Is there a way I can specify a specific port?
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2answers
37 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. ...