Software that controls what connections can be made to and from a network.

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4answers
21k views

Using pfSense, OpenVPN Connects but Still Can't See the Network

I am having an OpenVPN issue. I have a pfSense box at home configured to allow traffic through a VPN tunnel. The client computer is Windows XP Home, behind a standard Comcast connection and a ...
4
votes
2answers
382 views

Every single application in Windows 7 (even these not using internet at all, like notepad.exe) trying to access internet

After some recent AV/FW software update (Comodo) and restarting my computer, I was alarmed with big amount of warnings that application "x" (where "x" is pretty much all of what I try to run) try to ...
4
votes
2answers
713 views

Would there be any problems with DEP turned off?

I recently moved to a fresh Windows 8 x64 system and I learned that my favourite firewall (JPF - Jetico Personal Firewall) doesn't get along with Win8x64 (CRITICAL_STRUCTURE_CORRUPTION errors), but I ...
4
votes
3answers
316 views

What security changes are necessary when connecting DSL modem directly to PC instead of router?

Windows XP I have a user with a single PC that was connected to the internet via a standard home router. The router is now having hardware-related issues and to save money, they're considering ...
4
votes
1answer
38k views

Windows XP Wifi connected but can not access Internet with browser

I have two laptops: Windows Vista laptop which connects fine to Internet (writing this post from it now) Windows XP SP2 laptop which connects fine to Wifi, Router but not Internet When I try to ...
4
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2answers
6k views

Detect what outgoing ports are bypassed by firewall

My school has a firewall which limits most outgoing ports. There're only TCP/80, TCP/443, TCP/21 allowed. Is there's a way to find out all the outgoing port allowed by the firewall? My current idea: ...
4
votes
1answer
75 views

Is password required for restricted database servers [closed]

I have a dedicated Database server which is have PostgreSQL 9.1. This server has firewall. Only 10.0.0.3 is allowed to connect and access to this server via Firewall. All other requests from other ...
4
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3answers
3k views

Mac OS X's firewall asks: allow the application “master” network access?

In OS X 10.6.5, the following dialogue popped up: What is this application? What does it do? Cheers! EDIT (to increase googlability): OS X firewall: Do you want the application "master" to accept ...
4
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1answer
865 views

Safely share a printer in my local network

I have a Windows 7 PC with an attached laser. I want to share the printer over my network, which includes a Wifi router. How can I do this safely without allowing outside traffic to get into it? It's ...
4
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2answers
1k views

Losing 1/3 of my download speed with my new router, any ideas on how to fix?

I recently replaced a dying D-Link router with a Cisco/Linksys RSV4000. I'm really happy with the device but it seems when my cable modem is plugged in to it I lose 1/3 of my download speed. When I ...
4
votes
1answer
365 views

Intermittent connection and “Firewall Blocked” log entries on Cisco DPC3939B with firewall “disabled”

First, I apologize if this question seems to be "all over the place". I've tried to sum it up as clearly as I could, but there are a lot of moving parts, so I've tried to be detailed with my ...
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4answers
11k views

Is it possible to put UFW on CentOS?

If so, how would I do it? If not, is there an easier way to set some basic rules on CentOS other than iptables? I'm more of an app developer and less of a sys admin.
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2answers
3k views

Fedora 20 FirewallD GUI not working on X11 forwarding

I am having a problem with SSH X11 forwarding on Fedora 20 with firewall-config, the GUI tool for FirewallD (the dynamic firewall system). With most X11 GUI applications including pretty much all ...
4
votes
2answers
6k 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. ...
4
votes
1answer
425 views

How to block a program from using IPv4?

I have a program that can communicate over IPv4 (TCP and UDP) and over IPv6 (TCP and UDP). I want to block the program from being able to use IPv4. I tried the Windows Firewall: Except it blocks ...
4
votes
1answer
336 views

Hints on diagnosing performance issue in OpenBSD firewall

My OpenBSD 4.6 pf firewall has started having really bad performance in the past few weeks. I've isolated the firewall (as opposed to the WAN connection, switch, cable, etc.) as the problem, but need ...
4
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5answers
9k views

Bridge between Wired and Wireless networks for a single device?

EDIT 18/05/2011: Thanks for your answers, bridge mode IS the solution in most cases for this problem, but I can't use it because it breaks my web server. I am now looking at setting up a specific ...
4
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3answers
1k views

If you block an .exe file in Windows Firewall, are you also blocking the .dll files it uses or it needs to be done separatly?

Let's consider this scenario: There's some X software downloaded from the internet with one .exe file and several .dll files. The .exe file is prevented from accessing the Internet by using Windows ...
4
votes
4answers
17k views

Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...
3
votes
12answers
567 views

Is my computer security suite good enough? [closed]

I have a Windows machine and I run AVG free antivirus, Windows Defender and firewall, Spybot Search & Destroy, Outpost Firewall, and Prevx. I am just checking because I think I might have turned ...
3
votes
3answers
4k views

Which Linux-based firewall supports IPv6?

Out of the box neither IPCop nor ipfire support IPv6, not even on the green interface (internal LAN). How do I add IPv6 support to one of them? If that's not possible, is there a linux-based embedded ...
3
votes
4answers
911 views

How does a firewall contribute in mitigating IP spoofing attacks?

I understand that you can implement a firewall to only allow access to a server from specific IP addresses, but can't people fake the source IP address in a TCP packet? How does this actually stop ...
3
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2answers
6k 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?
3
votes
1answer
1k views

How to make any IP accessible outside the network

Is it possible to make my internal IP accessible outside the network? Something like 192.168.x.xxx. If I try my external IP, I get redirected to the website of the company. I'm on Windows and I'm ...
3
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4answers
337 views

What is a good way to shield my computer against local (network) attacks?

I'm trying to secure my computer against local network attacks for when I'm at university or a LAN party. At home, we have a router which serves this purpose. But at university and LAN I don't have ...
3
votes
2answers
7k views

UFW is active but not enabled why?

I was trying to setup a firewall in my Ubuntu 12.04 machine. After some struggling I got the following. Isn't this sounds a bit odd? thomas@thomas-K40IJ:~$ sudo ufw status verbose Status: active ...
3
votes
1answer
13k views

How can I enable the firewall via command line on Mac OS X?

I can use the Security & Privacy preference pane to enable and disable the firewall, but how can I do it with the command line - something with defaults write maybe?
3
votes
2answers
4k views

Using localhost TCP/IP communication in a program - always safe?

I have an application which is separated to several parts (processes) communicating over TCP/IP, using a pre-defined port on localhost. Is this always safe? Can some kind of a firewall (corporate, ...
3
votes
1answer
293 views

Even googling not allowed ? Why?

Access has been denied 127.0.0.1! Access to the page: ...
3
votes
2answers
493 views

how do torrent clients circumvent router's firewall?

Could anyone please explain me how the deluge torrent client can get incoming requests to my local machine from the Internet, while I'm behind router's firewall and do not have any port forwarding ...
3
votes
2answers
13k views

OSX Lion, open a local port so people on my network can access it

I'm running django's simple HTTP server (using python manage.py runserver). It's currently running on port 8000. How can I open a port on my macbook and allow network traffic to visit my host on ...
3
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2answers
4k views

Windows cannot find the host name “download.microsoft.com” using DNS

When trying to download a file found on the Microsoft downloads center that starts with, for example, http://download.microsoft.com/download/6/8/7/(some_GUID)/(some_file_name.ext) i get a timeout with ...
3
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3answers
5k views

How do I get the Windows 7 Firewall to prompt me whether to allow or deny a new connection? [duplicate]

Possible Duplicate: How can I configure the Windows 7 firewall to prompt me on outbound traffic? In Vista and before, new programs attempting an ingoing or outgoing connection would cause a ...
3
votes
3answers
585 views

Vyatta Firewall structure and Interface Direction

I've just purchased a Ubiquity EdgeRouter ER-8, and I'm working on configuring the firewall. In particular I'm confused about the direction "Local" for the interface I've defined as the WAN, and how I ...
3
votes
3answers
14k views

Source Address / Source Port vs Destination Address / Destination Port

I am new to TCP/IP and trying hard to learn basics. Well, I really wonder about inbound rules and outbound rules of Firewall and concept of source adress:port, destination adress:port. For example I ...
3
votes
2answers
11k 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 ...
3
votes
3answers
234 views

Creating a secure LAN within an insecure LAN

I have multiple computers on an insecure network (with third party, untrusted computers). My computers and the third party computers are all behind the same firewall. Currently my computer's software ...
3
votes
2answers
9k views

How to isolate WLAN clients in OpenWRT?

I'm currently setting up a public wireless network. I want to prevent the clients from talking to each other. Here's my current setup. /etc/config/firewall without anything related to lan: config ...
3
votes
1answer
633 views

I want uTorrent to use one ISP, and all other applications to use another ISP

I have a Windows 7 based desktop with two LAN cards (NICs): NIC1 is connected to a router, which connects to a reliable ISP with a low data cap (Fair Usage Policy). NIC2 is connected to an ADSL ...
3
votes
1answer
486 views

How to setup firewall ports via logon script

I work as IT suport for public service. We use domain controller and logon scripts. These scripts are pretty helpful, since they can automatically install printers and add network folders as local ...
3
votes
2answers
1k views

ISP blocks the use of ssh?

I fail to use ssh connecting to my remote machine, the detail situation is as following: The remote machine is behind a firewall, but can be connected using ssh with port 45992. I used to connect to ...
3
votes
1answer
2k views

Can my firewall block web-based emails?

I am not receiving emails in my hotmail account from one particular address. (They're not being filtered out as junk mail, before you ask) I have been given the suggestion that they are being blocked ...
3
votes
1answer
8k views

How can I prevent Windows 7 from automatically changing the firewall settings (turning it back on) when changing network location?

By default, the firewall is turned on on all my workstations. I want to disable it. That works just fine. However, if Windows thinks there is a change in the Network Location, the "Set Network ...
3
votes
1answer
1k views

Firewall blocks localhost but only if it's turned on

I run XAMPP server on my Windows XP. If I try to access to http://localhost or http://127.0.0.1 it gives me this error: Could not connect to remote server This only occurs if my Comodo firewall ...
3
votes
1answer
1k views

Although my firewall is off, I cannot connect so some ports on my mac (Mountain Lion)

I have a mac-mini (Fall 2009) with OS X 10.8.4 on my local network and I am running a simple http server on port 5000 (or any other port). I have turned the firewall OFF. I can connect to the mac via ...
3
votes
1answer
522 views

Firewall for controlling network traffic

I'm wondering if it is possible to have a firewall on Windows 7 that can only allow network traffic to one IP address, and from that one IP address? I'm using a VPN that tunnels all my internet ...
3
votes
1answer
13k views

Block (or only allow certian) incoming IP addresses on Verizon FIOS Actiontec Router

I opened a few ports to the outside of my home network so I can get into a few of my machines from outside. When checking some logs, I noticed that I was getting scanned on some ports from various ...
3
votes
3answers
6k views

How come I can't ping my home computer?

I'm trying to set up a vpn into my home computer in order to access files from wherever. I have the home computer set up with a no-ip dynamic dns program so I can always connect, and have also tried ...
3
votes
1answer
75 views

UDP “connections” rejection

I'm managing (edit: is hosted by VPS hoster) small machine for couple of game servers and website server (apache) together with some friends. Problem is firewall sometimes drops UDP packets. The ...
3
votes
1answer
482 views

How to isolate networks with a Mikrotik router?

I have recently got a Mikrotik router for my network, and I want to create 3 networks that are isolated from each other but all have internet access: The "main" network for PCs, etc. A network for ...