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

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4
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6answers
773 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
209 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
811 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
3answers
2k views

Is it recommended to run a firewall/router on a virtual machine?

Googling found me people saying running a firewall/router as a virtual machine is "dangerous" but none of them gives any reason as to why it is so. I also found posts from people who are successfully ...
4
votes
2answers
17k views

need iptables rule to accept all incoming traffic

For my test environment i want to accept all incoming traffic, can someone please give me the iptable rule to be added. My current iptables -L -n output looks like this Chain INPUT (policy ...
4
votes
2answers
124 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
11k 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
5k 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
139 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
2answers
3k 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
3answers
20k views

Is there a simple way to detect ISP port blocking?

Is there a way to tell the difference between my ISP blocking traffic on certain ports and my NAT router/firewall blocking that traffic? The sites “Shields Up” and “Can you see me” show my ports ...
4
votes
3answers
148 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
1answer
273 views

How to easily determine, which outbound ports aren't blocked by firewall

I'm behind fairly restrictive firewall regarding ports, that can be used for connecting outside. I'm also running service on my remote box, and I want to connect to it. Problem is, that I'm unable to ...
4
votes
2answers
935 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
2answers
8k views

How can I restrict windows 7 to only use the local subnet, but block the internet

I want to block all internet connections to and from my windows 7 machine, but allow it to access everything on the local network. The local network is behind an Apple Airport Extreme. What is the ...
4
votes
4answers
13k 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
609 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
189 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
1k 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
24k 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
9k 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
66 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
1answer
673 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
963 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
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. ...
4
votes
1answer
205 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
261 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 ...
4
votes
1answer
195 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
2answers
372 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
547 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
7answers
6k 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 ...
3
votes
4answers
3k 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 ...
3
votes
2answers
4k 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 ...
3
votes
1answer
820 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
4answers
315 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
2answers
3k 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
votes
3answers
179 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
1answer
370 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
3answers
4k 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
1answer
448 views

How can I check what outbound ports are allowed in a network?

On some networks (primarily corporate ones), the firewall restricts outbound connections to some port number. The allowed ports generally comprise of port 80, 11, 443, etc. Is there a way I could do ...
3
votes
2answers
389 views

Weird hits on port 2703

I'm getting these periodical console messages on my Mac: 7/22/11 8:01:03.925 AM Firewall: Stealth Mode connection attempt to UDP 10.0.0.1:2703 from 91.143.232.133:15881 7/22/11 8:01:05.885 AM ...
3
votes
1answer
1k 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
2answers
2k views

Local port forwarding on a mac

I need to have the mac take traffic coming into it on one port send the traffic to a different but still local port. I.e. Traffic comes in on port 1234 and transfers to port 5900 (vnc) This is ...
3
votes
1answer
476 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
259 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 ...
3
votes
2answers
700 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
7k 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 ...