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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Prevent firewall to turn off by itself

I noticed that the Application Firewall turns off by itself, probably every time I restart. I know that the firewall is turned off by default but I thought once changed it stays on, any idea of what ...
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2answers
2k views

Little Snitch reports outgoing connections for AirPlayXPCHelper for wrong subnets?

After upgrading to El Capitan, I've started noticing annoying connections from the AirPlayXPCHelper to 192.168.1.0/24 subnet (my home network isn't in 192.168.1.0/24 subnet, it's in 172.16.0.0/12 ...
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2answers
2k views

How can I tell Firewall to allow incoming connections for Python.app running Django

Each time I run my Django development server, I get a dialog to allow incoming connections. No matter what I do : Click Allow in the dialog box Add to the Firewall via the OS X GUI (both real and ...
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15 views

pfctl config to only allow openvpn connection

I found what appears to be a suitable guide here but pfctl complains of a syntax error and "no IP address found for en3" which is my main interface. I have had other pf rules working successfully to ...
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1answer
1k views

Port blocking on iPhone 6

I am unable to get email to connect to my IMAP server using an iPhone 6+ with iOS 8.3. The telco (Telstra Australia) loves telling me that they do not block ports. Either the telco is blocking ports ...
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10 views

Q: Way to limit (not block) frequency of certain connections?

Third party software is okay, although I've tried things like Little Snitch, and the closest feature they have is the ability to create "temporary rules" (i.e. rules that allow/disallow specified ...
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2answers
43 views

How to Locate an App Running in the Background

My Mac is a work computer that used to have LANDesk installed. My admin ran a script that uninstalled it. However, when my machine starts I still get prompted to allow apps from LANDesk (vulscand, ...
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1answer
1k views

packet forwarding on OSX mavericks

My MacBookAir(Mavericks 10.9.2) need to share my internet connection(wi-fi;en0) with BeagleBoneBlack(BBB) which are in 192.168.7.0 subnet over en6 interface. ifconfig $ ifconfig lo0: ...
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20 views

How to start pfctl at boot

Before El Capitan I used to enable pfctl at boot by adding -e to the start up parameters. In /System/Library/LaunchDaemons/com.apple.pfctl.plist <string>/sbin/pfctl</string> ...
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1answer
31 views

For security reasons, what should I block with the firewall?

For security reasons, what should I block with the firewall? I'm just interested in the system itself, not additional installed software. For example, I'd like my system to synchronize the clock or ...
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2answers
1k 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?
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1answer
112 views

Port forwarding in OS X 10.10

I have to forward every internet page to my local address i.e. 127.0.0.1 using OS X. I tried following command but it has no effect: echo " rdr pass inet proto tcp from any to any port 80 -> ...
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39 views

What network access can I safely block for Adobe Creative Cloud?

Adobe Creative Cloud talks to a lot of servers via a lot of services, and it personally makes me uncomfortable when software talks home a lot like that. So I'm wondering, what of those network ...
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1answer
29 views

Using Package Installers behind company firewall

Is there a more efficient way to use package installers behind a firewall than adjusting the proxy settings for each installer? As of now, I'm using Ruby Gems, Bower, and NPM and it's a pain to ...
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2answers
102 views

How do I drop outgoing packets to specific host/port?

I want to test something locally. For that, I'd like to be able to drop outgoing packets sent to a specific host/port. I tried messing around with pf rules using Murus (the non-free version), but have ...
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1answer
121 views

How to Use Terminal for “Little Snitch” Functionality without Little Snitch

I'm a Terminal newb, and trying to wrap my head around manual "Little Snitch" functionality without using Little Snitch. From the research I've been doing, I've landed on the fact that I need to ...
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1answer
327 views

What is the modern way to do port-forwarding on El Capitan? (forward port 80 to 8080)

The old utility ipfw was discouraged in recent versions of Mac OS X and is now gone from El Capitan. What is the modern way to do port forwarding in El Capitan? I simply want port 80 to forward to ...
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27 views

How to stop the firewall from dropping packets from outside my network

I have a Mac Mini, with OSX 10.11.3. My problem: I have configured the application firewall to accept incoming connections for a number of services. These I can access fine from hosts within the same ...
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1answer
59k 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 ...
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2answers
64 views

OS X firewall code-signing not working for nginx etc

I am trying to connect to a web server (nginx) on OS X El Capitan - on local wifi from an iOS device. I know from earlier that this is not easy. Tried this without success. Have you come across ...
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1answer
449 views

Allow port arbitrary port (such as 5432) open on El Capitan.

I'm running vagrant and successfully port forwarding from there. My issue is that some ports are not running. I know vagrant is working because I can successfully forward port 80, but cannot forward ...
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6answers
46k 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 ...
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53 views

Little Snitch shows ping flood to 0.0.0.192

My Little Snitch Network Monitor tells me my machine is ping'ing 0.0.0.192 every second. What's going on? EDIT: A Wireshark capture tells me this ping has Source 0.0.76.188 Destination 0.0.0.192 ...
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1answer
28 views

Systems not seeing netrestore image

Turning to here after many futile attempts to resolve. I have an OSX server (10.10.5) which has been hosting a Netrestore image over HTTP without issue for some time now. We replaced our firewall in ...
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94 views

pf port-forwarding on OS X Yosemite to avoid block

My ISP blocked a TCP port, let's say $ip1:$port1 So I setup $ip2:$port2 on my own VPS to get around it. How can I forward all traffic to $ip1:$port1 on OS X Yosemite as client to $ip2:$port2 using ...
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1answer
112 views

OS X firewall blocking torrents outside of VPN

I've seen plenty of tutorials for this around for Windows but I'm wanting to do it on OS X Yosemite. Is it possible to configure the firewall such that torrent traffic will only ever be permitted when ...
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232 views

How to open specific port in EI Captain?

I have gone through many articles (please list one article you are following so we might suggest a better or at least follow along) and found the same solution but no result?? I have done -> sudo ...
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1answer
769 views

Issue turning firewall off on OS X El Capitan 10.11.2

I'm trying to make a simple web server on my machine accessible to a peer on the same network, but with not much success. I am having an issue where my firewall continually turns back on, or won't ...
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1answer
174 views

How to accept incoming network connections in OS X 10.11 El Capitan?

After logging in the following message appears: Do you want the application “Microsoft Word.app” to accept incoming network connections? How do I allow Word to accept incoming network connections in ...
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26 views

Shared Little Snitch rules for all browsers

In Little Snitch (v. 3.6), can I somehow define a shared set of rules for all browsers? i.e. define Firefox, Safari and Chrome to be part of a "group", and update the rules for the entire group ...
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111 views

Blocking/Disabling network connections remotely without losing remote access

I have a Windows 7 computer accessing an El Capitan Mac remotely via TeamViewer (a VNC program) While I'm remotely controlling this computer, I need to disable the internet (equivalent of disabling ...
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1answer
67 views

I need help getting the pf firewall to work

Okay, so I asked this question on security.stackexchange.com and superuser.com and no one on either of those forums answered. Hopefully someone here will know the answer. I am running Mac OS X. I ...
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2answers
7k views

Xcode.app gets scanned by socketfilterfw (OS X Firewall) at every launch

Situation: When I launch Xcode, socketfilterfw, OS X's application based firewall, starts using a lot of CPU. After some research I narrowed it down to this: socketfilterfw reads all the files in ...
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2answers
3k views

Apple Remote Desktop Admin blocked by OS X Yosemite Firewall

I'm experiencing an issue where the Firewall in OS X Yosemite is repeatedly preventing me from launching ARD Admin. Symptoms: Launch ARD and no window appears. I am forced to force-quit the ...
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1answer
104 views

Browsers opens only https sites

I have OS X Mavericks on my Mac and 3 browsers (Firefox, Safari, Chrome). When I try to open any site I see only "connecting..", but when I try https sites it works fine! Ping and traceroute shows ...
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1answer
316 views

How to trap ssh breakin attempts on El Capitan

Previous to El Capitan one could use pfctl and /etc/pf.conf to "trap" the ip addresses of sites attempting to break into a server using brute force attacks producing 100's of attempts per second. The ...
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2answers
6k views

How can I setup my mac (OS X Yosemite) as an internet gateway

It should be possible, but I searched for a day and cannot get a decent HowTo. There seemed to be a Gateway Setup Assistant, but the Wikipedia link only goes to the server app now. Maybe it is easier ...
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1answer
75 views

mDNSResponder - incoming connection from “[name of my Macbook]'s-macbook-pro.local”

As I logged into my admin account to set some things up on my Macbook (I surf using a standard account), I noticed via my third-party firewall application, Little Snitch, that mDNSResponder had ...
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283 views

Microsoft Word to accept incoming network connections

Lately whenever I open Microsoft Word 2008 I get a prompt Do you want the application “Microsoft Word.app” to accept incoming network connections? I always click Deny (I can't think why anyone ...
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1answer
53 views

Incoming connection on UDP port 137 (NBNS) from an internal IP address?

I have a Little Snitch (a third-party firewall application) on my Macbook running OS 10.11.1. I noticed that because of my settings to deny most incoming connections from the LAN, the launchd process ...
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48 views

VPN connection sharing using PF NAT

I have the following network infrastructure, with a Mac Pro that has a VPN connection (ppp0): What I'd like to accomplish is that Device 1 and Device 2 can share the Mac Pro's VPN connection by ...
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4answers
14k 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 ...
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53 views

Blocking All Apple Services from OSX

How does one stop Apple from having any sort of control over your mac? For example, they can erase it, track its location etc and even the push notification service lets them know when you're using ...
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4answers
470 views

I'm trying to block game “X” from accessing the internet including updating

I'm using OS X El Capitan and I'm trying to prevent a game from accessing the internet including blocking it from checking for updates for the launcher or the game itself. I've gone into Security -> ...
9
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4answers
8k 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 ...
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2answers
9k 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.
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2answers
3k 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 ...
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199 views

How can I block ssh brute force attempts in OS X 10.11?

My system running OS X 10.11 is constantly getting hammered by failed ssh login attempts by bots. I'm using a secure password and the root account isn't accessible via ssh, but even so it's still a ...
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1answer
55 views

How do I open a filtered port in pf?

I have opened a number of ports, and am familiar enough with pfctl, but even though I have opened various ports, then show up as "filtered" - which means of course that they are not open. How can I ...
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98 views

Any way to transparantly redirect outbound traffic to a particular IP:port on OS X?

OS: Yosemite Basically I am looking for something similar to Mac os x ipfw forward from ip:port to ip:port but since there is no ipfw on Yosemite is there a way to do this trick using pfctl or ...