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

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Block all network traffic from/to laptop except explicit apps/protocols/targets?

Usually I connect my WinXP laptop via WiFi to my home LAN, but sometimes I have to use tethering with cellular phone where traffic prices are very high ($1 = 2 MB traffic counted in both directions). ...
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4answers
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If I use an SSH tunnel to get around a firewall, what does the sysadmin see?

I use an SSH tunnel for the port my browser uses to access the internet. The result is I get around the firewall my network uses, which prevents me from using many sites I want to use (facebook, ...
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3answers
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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 ...
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5answers
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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 ...
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6answers
789 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 ...
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2answers
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Tracing what program is making a network connnection? (CentOS)

I was wondering if it is possible to find out which process is trying to make a specific network connection. On a server I support which hosts websites for about 200 users, the iptables firewall keeps ...
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781 views

Running a webserver behind a firewall I have no access to

I'm having a bad time in my student appartment: I want to run a webserver on my Laptop, which should be reachable from outside of the net. I'm sitting behind some proxy-server that passes outgoing ...
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Is there a way to sync/mirror website file and database between two remote servers?

Here's my situation, I have website "A" sitting behind a intranet firewall, inaccessible to the people outside the intranet. I intend to have a outsourced developer work on "A", but he's not able to ...
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Why can't we turn off firewall And file sharing?

I was under the impression that turning off file sharing "makes it more secure". Especially when I like to have my firewall switched off, turning off file sharing becomes more important to me. But ...
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3answers
365 views

Looking for a new, free firewall (Sunbelt has a huge hole)

I've been using Sunbelt Personal Firewall v. 4.5 (previously Kerio). I've discovered that blocking Firefox connections in the configuration doesn't stop EXISTING Firefox connections. (See my post ...
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2answers
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How can Windows XP's firewall be made to block a specific application?

I haven't used Windows XP in a while, and as it looks, its built-in firewall. When turned on it should be blocking every application, while letting you add exceptions to let some through. However, ...
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Lync keeps dropping because of D-Link DIR-601 router. How to configure firewall to fix this?

I saw this article, and it's exactly my problem, but my settings are a bit different and nothing seems to have fixed it so far. Why does my D-Link Router keeps dropping my Outlook and Lync ...
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Firewalling VirtualBox: restrict host inbound connections to guests only

I have Windows7 + Cygwin and VirtualBox. I would open a listening port on the host accepting only inbound connections from the VMs. Note: In many case the server services running on the host can be ...
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1answer
124 views

Block a Subdomain in Windows Firewall

Gamespy is ceasing its Master Server support for many games at the end of May, including Crysis 1, Wars, and 2. I have worked with Crysis 1 and Crysis Wars for a very long time, and now the entire ...
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1answer
150 views

what ports to open up for GitHub to install and work?

I want to use GitHub on a server where user accounts are not supposed to be able to go online otherwise. The GitHub Windows app does not even install without users' downloading it themselves (see my ...
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1answer
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unable to start apache after changes to rc.conf and resov.conf

I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the ...
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Vista Windows Firewall - how to block all ports apart from 1 on a particular subnet?

This is fairly easy in Win7 because that version of Windows Firewall allows you to block a port range e.g. 1-79,81-65535, leaving only a single port open. However Vista (at least by default) doesn't ...
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479 views

VNC Connection: Bypassing Firewall Using VPS

I have a friend who lives far away and needs technical support. So far I've been unable to diagnose the problem over the phone, so I was looking to use a VNC connection to remotely troubleshoot his ...
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1answer
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Windows firewall blocks outbound connection that is allowed by a rule

I have configured Windows Firewall to block all outbound connections. I have then created "allow" rules to enable certains applications to create outbound connections. Unfortunately it seems that some ...
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2answers
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Open a port safely in firewall for a PC connected to Internet

This is related to this question PCs in same network can not communicate My real problem was that I have a web application I want to test running in PC1 but I noticed I could not even ping the ...
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3answers
625 views

Stealth Ports even while communicating?

I was using a port probing site/program called ShieldsUp! to scan my ports. It reported back that all of my ports were "stealth", and in their words Your system has achieved a perfect "TruStealth" ...