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

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5
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8answers
15k views

Internet connection under Windows Vista stops working until reboot [closed]

I have a fairly clean Vista Home Premium SP1 install on my desktop. There aren't many applications installed. My Internet connection always seems to stop working after web surfing for a while - ...
5
votes
3answers
1k views

How can I get my routers to forward ports correctly?

My network currently looks like this (simplified): Note that Router #2 is connected to the LAN interface of Router #1. This should be familiar to anyone who has seen a standard static-IP setup ...
5
votes
2answers
559 views

Prevent specific application from using metered network connection

Windows 8 introduces the new category of metered network connections. Applications that are aware of this type of connection can choose not to use it in an effort to reduce connection costs. I would ...
5
votes
1answer
511 views

Rackspace Firewall/Gateway Setup

I have rackspace account and wish to have this sort of setup: Firewall/Gateway eth0 - Public IP (56.X.X.X) eth1 - Private IP (10.X.X.X) Ubuntu 10.10. Accepts connections from the internet and ...
5
votes
2answers
1k views

Cookies blocked by router?

My friend has a D-Link DI-524 router that she uses for her home broadband. It's a pretty vanilla setup with the standard firewall settings, DHCP enabled etc. However, recently she has experienced ...
5
votes
1answer
1k views

Remote Desktop access Windows 7 system from Windows 8

I have 2 windows systems... Windows 7 (192.168.2.8) Windows 8 (192.168.2.9) Both are connected to WiFi router. They have been assigned address 192.168.2.8 & 192.168.2.9 respectively. I have ...
5
votes
2answers
2k views

Connect and use to multiple networks in Windows 7?

The core of this questions I suppose is "How to I tell Windows 7 which interface to use for each network?" My current set up is: 1) 10/100 cable connected to my corporate network, which is behind a ...
4
votes
7answers
8k views

Is there a way to determine which service (in svchost.exe) does an outgoing connection?

I'm redoing my firewall configuration with more restrictive policies and I would like to determine the provenance (and/or destination) of some outgoing connections. I have an issue because they come ...
4
votes
4answers
4k views

how to ssh two computers behind NAT and Firewall, without third computer

I am trying to ssh into my Linux box at home. My home is a dorm-style environment - NAT and Firewall with personal laptop running Arch Linux. My work is corporate style Windows 7 - NAT and proxy ...
4
votes
2answers
6k views

Stopping PING requests on my home router

I can imagine that somehow not responding to PINGs from WAN would be an ok idea regarding home network security. But can there be any down-sides to this? I imagine games implement their own PINGs, so ...
4
votes
9answers
3k views

Force web address to go through HTTPS

At my work, http://twitter.com is blocked, but https://twitter is not. Is there any way to have all programs/browsers access this URL using the HTTPS protocol instead of HTTP? This specifically ...
4
votes
3answers
4k views

Configure OSX Firewall to Allow SSH Server?

If I turn on my OSX firewall, ssh is disallowed. If I turn it off, ssh can connect just fine. These are the settings from the ssh host: while I don't know what I'm doing, I figured that giving ...
4
votes
6answers
795 views

Standalone firewall + antivirus or combined security tools?

For years I'm using some antivirus software and different firewall. Now every antiviruses have got some firewall features and there are complete "internet security" complexes... and every firewall get ...
4
votes
7answers
214 views

Corporate site filter

Alright so my work blocks a bunch of websites for obvious reasons. They even blacklisted logmein.com so thats out. I feel that I am capable of getting all my work done AND keeping up with my warfish ...
4
votes
3answers
1k views

What are the most common dangerous domains that I should block?

I am trying to configure my wireless router to block domains that are potentially dangerous to privacy, security, and bandwidth-hogs. Is there a list of domains that I can block at the router level? ...
4
votes
2answers
6k views

Deny all incoming connections with iptables?

I want to make some simple iptables rules to deny all incoming connections and allow outgoing. How can I do that?
4
votes
2answers
127 views

Is hardware firewall useful?

I found out that my PC was attacked, which took almost 99% of my upload internet resource for unknown usage for more than two months. I formatted my PC; update windows and internet security. It should ...
4
votes
5answers
16k views

Windows Firewall is blocking Windows Update

I recently uninstalled ZoneAlarm and have decided to use Windows Firewall as my firewall as ZoneAlarm was causing me grief when I was syncing my iphone. Anyway, I've noticed just then that Windows ...
4
votes
2answers
6k views

If I use a proxy server, can my computer bypass the ISP?

If somebody is using some kind of proxy server to connect to the internet, does their computer connects to the ISP first and then to the proxy server, or does it connect to the proxy server first and ...
4
votes
3answers
146 views

Is there specialized software for testing the security of a computer?

I'm trying to secure my computer against local network attacks for when I'm at university or a LAN party. Although my dad's computer store is also running a Windows Server so it might be handy to ...
4
votes
3answers
166 views

Is there a respected AntiVirus and software firewall app that doesn't invade your privacy?

I recently purchased ESET's AV and firewall software suite. I know it to be a respected app but when reading the license while installing they made it clear that they will collect not only information ...
4
votes
2answers
1k views

What is the best way to restrict network access for one machine on a home LAN?

As an example, I have 3 computers on a home network: Machine A Machine B Machine C What I would like to do is isolate "Machine C", so that it cannot communicate with "A" or "B" and vice versa. It ...
4
votes
1answer
2k views

How to append netsh firewall rules, not just replace

I am using a script to set firewall rules in netsh. netsh.exe advfirewall firewall set rule name="Block External IP's" new remoteip="$($ipArray[0])" I thought that set was used so that it would ...
4
votes
4answers
16k 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
653 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
256 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
2answers
2k views

How can I prove (with logging) where a port block is occurring?

How can I prove (with logging) where a port block is occurring? I've set up an FTP site on IIS (windows 7 home) and set up a rule in the Windows Firewall allowing access. The ftp site is accessible ...
4
votes
1answer
30k 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
votes
2answers
12k views

How to use OpenVPN through a restrictive firewall?

I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used ...
4
votes
1answer
70 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
votes
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
votes
1answer
771 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
votes
2answers
995 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
4k views

Import Export specific Windows Firewall Rule

How do I Export and Import specific Window Firewall rule (both Inbound and Outbound) ? I can do Import / Export policy but it will use ALL rules not specific rule. Same with Export List, it can ...
4
votes
2answers
4k 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
270 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
242 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
votes
5answers
8k 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
votes
3answers
821 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
13k 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. ...
4
votes
2answers
441 views

Issue with China's Great Firewall (or other odd networking issue)

We periodically deploy an application to a computer located in China (from Canada). We deploy the changes using Subversion - we're talking a ~100Mb diff. We've noticed that the speeds are good until ...
3
votes
12answers
554 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
4answers
609 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
votes
1answer
974 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
votes
2answers
3k views

What does an empty iptables mean?

I’m using CentOS and when type in the following iptables command: iptables -L -v The output is as follows: Chain INPUT (policy ACCEPT 19614 packets, 2312K bytes) pkts bytes target prot opt in ...
3
votes
4answers
323 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
3k 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
3answers
5k views

How to SSH an outside server from a computer which is behind a proxy firewall?

I access the Internet through an HTTP proxy firewall at college. And I need to login to a computer, via SSH, which is outside our network. I tried it as Linux command and on Windows using PuTTY. I ...
3
votes
4answers
5k views

Multiple web servers behind a single firewall

I have multiple web servers behind a single firewall (SVN, Exchange, etc.). I want to be able to access all of the various servers remotely, but since they are All using the same port (the standard ...
3
votes
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 ...