Typically software that runs to prevent network traffic from reaching a computer. Also a hardware device that works on a network level rather than running on a single computer.

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12
votes
3answers
24k views

How can I open a port (not application) in the OS X 10.6 firewall?

Let me preface this by saying: I do not want to drop my firewall completely Yes, I really do need particular ports rather than an application. So I see that there is the option to allow particular ...
11
votes
2answers
4k views

Reasons to prefer Little Snitch over the built-in firewall

Every now and then I browse through software you must have on your mac type lists and more often than not somebody mentions Little Snitch as a must-have application. Now what I think that many people ...
11
votes
3answers
6k views

How to get rid of firewall “accept incoming connections” dialog?

I've accepted this so many times that firewall should already remember it. For example, I get it for Eclipse when starting my java programs in debugging mode ... sometimes this dialog is displayed ...
10
votes
1answer
19k views

Should I block incoming connections from “netbiosd”?

My (application) firewall settings are configured to block incoming connections from netbiosd. I don't recall setting this myself, and wonder what the consequences are. What are the consequences of ...
8
votes
2answers
1k views

Disable Little Snitch in guest account?

It's annoying as hell to let others use your computer on a guest account with Little Snitch installed, all the consecutive popups one after another...it's really ridiculous. Also in the event my ...
8
votes
2answers
2k views

Why does Microsoft Word need to allow incoming network connections?

When I turn on the Mac firewall I get prompted to allow the MS office apps (Word, Excel, Powerpoint) to accept incoming connections. Why is this, and is it safe to allow it ? I'm running Mac OS ...
7
votes
1answer
3k views

How stealthy is the stealth mode of the firewall? Does it increase security?

In the System Preferences there is the option: `Security & Privacy -> Firewall -> Advanced... -> Enable Stealth Mode Does this options significantly increase the security when ...
7
votes
2answers
2k views

Can I block ports in Hotspot mode?

I would like to block ports when using my iPhone 4 (iOS 5.0 jailbreaked) as a hotspot. The reason is I don't want my backup program, computer updates or any high bandwidth usage tool to be able to ...
7
votes
3answers
22k views

How to restrict “Remote Login” (ssh) access to only certain IP ranges?

Can someone please tell me how to restrict SSH access only to certain IP ranges (e.g. local network) and not the whole Internet? I guess this has to be done via firewall.
6
votes
4answers
2k views

How can I get the exact URLs/requests that a program is trying to connect to?

I currently use Little Snitch to control network traffic on my Macbook Pro, and see what my apps are connecting to. Unfortunately, Little Snitch only shows you the hostname that an app is connecting ...
6
votes
2answers
2k views

Enable ssh-key-only login to my Mac for 1 user

I have a Macbook Air that I would like to allow remote SSH access to without a password. I have created a user called remotepair that I have logged into and verified I can used the Mac with. I have ...
6
votes
1answer
460 views

Always Asked to Configure Firewall for iTunes

Whenever I open iTunes, I get the standard OS X dialog, Do you want the application "iTunes.app" to accept incoming network connections? Every time I click allow, but I am asked the same thing without ...
5
votes
3answers
266 views

Open ports. Safe?

My friend is currently running the default firewall with "Block all incoming connection" (except the basic ones like 80). I just scanned his mac for open ports and I found the following: Open TCP ...
5
votes
5answers
945 views

Is there a way to use different network connections for different apps

At work we have a firewall that prevents certain outbound connections. But I also have a Clear wireless personal hotspot. I would like to use the work connection for normal requests but for certain ...
5
votes
1answer
256 views

Mountain Lion firewall is randomly delaying DNS requests

I recently experienced some delays during DNS host resolution on OS X 10.8. To test it I started a simple script which tries to repeatedly resolve the same hostname 20 times: #!/bin/sh for i in `seq ...
5
votes
2answers
5k views

Migration Assistant fails on Ethernet Mavericks-to-Mavericks migration

I have the following setup and am attempting the use Migration Assistant over Ethernet: Source machine: Early 2009 24-inch iMac running OS X 10.9 Destination machine: Latest MacBook Pro Retina ...
4
votes
1answer
5k views

Is ipfw available in Mountain Lion?

Is ipfw available in Mountain Lion? The reason for asking is that they introduced pf in Lion, but kept ipfw, however there is a chance that ipfw would eventually be removed. I found this: Can I use ...
4
votes
2answers
5k views

Do iOS 5.1 devices have a firewall?

Does iOS 5.1 support a built in firewall like Mac OS X does? Can't see anything about it in Settings.
4
votes
3answers
3k views

Questions about how Internet Sharing works

A simple checkbox and a menu allow you to share your internet connection (no matter which interface you get it on) with any other interface (theoretically). But, the guts of this is a little ...
4
votes
2answers
1k views

“Accept incoming network connections” issue

Due to some graphic and/or code based changes, within programs like Dropbox, iTunes, jDownloader etc. (but mostly Java-based applications), the built-in firewall keeps asking for verification. ...
3
votes
3answers
3k views

Is allowing port 80 on Little Snitch safe?

In Little Snitch, I allowed port 80 when a "google.com" popup appeared on my screen. I'm wondering if that was a good idea. If a hacker installed a program on my Mac, and that program sent ...
3
votes
2answers
2k views

Mac OS X Server ignores remote HTTP connections, but accepts local ones

I cannot get Mac OS X Server's web server to accept connections from other machines on the same LAN. This is on OS X 10.8.2, running on a Mac mini which originally shipped with Lion Server. I can ...
3
votes
1answer
706 views

How can I restrict Mac sharing services to a specific network/adapter?

I want is to set up a Mac to connect to multiple networks. So far, so good. However, I only want to grant AFP access to users on ONE of the networks, but not the other. How can I accomplish this on ...
3
votes
2answers
162 views

How to block internet access of all apps (except browser) when using 3g usb modem?

Is there any app that helps me to block all apps for accessing the internet when using 3g modem?
3
votes
1answer
215 views

How can I disable any external traffic to my port 80?

I don't want others on the same network (or any network!) to be able to access my machine at port 80, where I have dev websites. I've tried adding this rule to ipfw: deny tcp from any to any ...
3
votes
1answer
638 views

Little snitch and different network profiles

Is there any way to have different "little snitch" rules set for different networking profiles ? like for HOME one rule list for WORK another etc ...
3
votes
4answers
3k views

How do I use ipfw to allow LAN access but deny Internet access?

How can I use ipfw (or another tool, if one is available) to allow unlimited access between computers on my LAN, but not allow access to the Internet? (The IPs on my local LAN are 192.168.0.xxx)
3
votes
3answers
153 views

I have a service listening on a port, how do I open the port externally?

I have a service that is listening on a tcp port, and it is listed with this command: >netstat -atp tcp | grep -i "listen" tcp4 0 0 192.168.2.5.8070 *.* LISTEN ...
3
votes
2answers
1k views

Fixing “a sealed resource is missing or invalid” warning

I've changed the application icon of my Eclipse editor, and this causes a confirm dialog to pop up asking me if I allow the program to accept incoming network connections. I faced this before, but ...
3
votes
2answers
261 views

What are the numerous incoming connections I see on public wifi for?

In general I have incoming connections disabled by my security software (Little Snitch). But even when I do this, on public wifi, I see numerous incoming connections for netbios and mDNSResponder ...
3
votes
1answer
1k views

How can I enable DVD or CD Sharing with the Firewall on?

I'm trying to enable "DVD or CD Sharing" in the System Preferences. When I enable it, it says that the Firewall is blocking it. If I go into the Security > Firewall settings, I see that the first item ...
2
votes
3answers
4k views

How does one lock down OS X Server using the PF firewall?

Assume I have ip blocks for China, Russia, North Korea etc. How would I configure pf to allow those IP addresses to only access ports 80 and 443, and be denied access to other ports? I have an ...
2
votes
2answers
187 views

How to configure `ipfw` on Lion, Mountain Lion?

I'd like to configure and start ipfw on Macs running Lion, Mountain Lion. I found that pfctl is configured and started with: /etc/pf.conf /System/Library/LaunchDaemons/com.apple.pfctl.plist How is ...
2
votes
3answers
6k views

Firewall settings with “imagent”

Among others that I recognize, I have the "imagent" been allowed to pass true my firewall (allow incoming connection). What/who is it, and do I must have it or can I just block it. I do not ...
2
votes
1answer
2k views

How to stop Windows firewall from blocking Bonjour hostname resolution

I have Bonjour installed on my Windows 7 PC, and the installer appears to have poked all the necessary holes in the Windows firewall. However, I can't ping windows-pc.local from my Mac. If I ...
2
votes
1answer
787 views

What's the “built-in” firewall in OS X 10.9?

By "built-in" I mean the backend of the System firewall (System Preference->Security&Privacy->Firewall). Is it ipfw or pf? (I know that ipfw was the backend for previous versions of OS X). And, ...
2
votes
2answers
3k views

Settings for Firewall and AirPort Extreme Router to Open a Port

I am trying to make ports on my OSX 10.6.5 mbp accessible to the open internet. The only thing I could find in the system firewall was allowing (or disallowing) a particular.app file, but nothing ...
2
votes
3answers
6k views

How should I set up the firewall and DHCP with an AirPort Extreme and Lion Server?

I'm trying to set up a network using an AirPort Extreme as a router (connected to the WAN on one end and the LAN on the other). I understand that out of the box I will have a hardware firewall, and ...
2
votes
1answer
1k views

Is ipfw the same as pf in FreeBSD?

I'm wondering if references referring to pf in FreeBSD are applicable to ipfw in Mac OS X Snow Leopard? I'd like to know to see if it's worthwhile to consult books on pf for use with Mac OS.
2
votes
3answers
1k views

Firewall on iPhone/iOS (ipfw or pf)

I want to run ipfw or pf on my iPhone -- or the equivalent. Seems simple, but I can't find anything that works. Device is jailbroken, looked very carefully through Cydia, and even through some of ...
2
votes
1answer
554 views

How can I turn off “iTunes incoming connection” warning?

I have enabled my firewall on Mac OS X Lion. And now every single time I open iTunes I get this warning:
2
votes
1answer
334 views

Configure ipfw to filter by ip range

I am a Linux user and very new to OSX. I have an OSX 10.7.5 "Lion" server that I am configuring as a webserver. I only have shell access. I am tryin to configure the firewall, but ipfw is quite ...
2
votes
0answers
199 views

Why does my firewall block connections even when it's off?

This most notably happens with iChat. I don't use a firewall, never have on this computer. When I first started using iChat (when Skype 5 came out and sucked hardcore) I couldn't video chat with ...
1
vote
1answer
95 views

Why can't I remove this top entry in the firewall options?

I go into the System Preferences, Firewall, then Firewall Options. I can't select the "File Sharing (FTP)" entry to remove it. How can I? Update: I'm running OS X 10.7.5, and nothing is enabled in ...
1
vote
2answers
1k views

How does Application Level Firewall work?

I'm a bit confused about OS X Mountain Lion's Application Level Firewall. I have enabled ALF (Application Level Firewall) in Settings -> Secuity & Privacy -> Firewall and have some rules for some ...
1
vote
2answers
33 views

Enable internet only for specific apps

I will need to spend few weeks with no internet, but I will still have my mobile hot spot. So I wonder if I can prohibit all apps including OS (which I know will try silently to update something) from ...
1
vote
1answer
1k views

How can I tell Firewall to allow incoming connections for Python running a specific script? (In this case: SickBeard)

I'm running SickBeard on my Lion installation, but I can't figure out how which Python version or script I should add to the Firewall rules allow connections from outside. In Console I get this ...
1
vote
2answers
675 views

Do firewall tools exist for OS X Mavericks for preventing brute force attacks?

Here's the deal: Over the last few weeks, I've noticed a large number of authentication failures for both the sshd service and the screensharingd service on my Mac OS X Mavericks server (running ...
1
vote
2answers
147 views

Can't access certain websites

I'm trying to access the site http://www.svenskadomaner.se but it's unreachable from my MacBook Pro (OSX 10.8.5). The domain belongs to a web hosting company and it's not only this specific site I ...
1
vote
1answer
11k views

Firewall for outgoing connections

Is there a firewall for OSX Lion, that allows controlling of outgoing connections? The built in firewall handles only incoming connections, apparently.