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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Mac won't load some web contents

My MacBook Pro 2012 running ML has started not to load certain web pages. I tried with every browser but I have the same issue. I thought it was a firewall trouble, but it's disabled. Tried to ping ...
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1answer
19 views

Little Snitch: Does restricting address/port for an application disable future connection prompts?

I have downloaded the trial version of Little Snitch. After install, when I am prompted with connection requests, I have the option to allow or deny the connection via "Any Connection" or "Only" a ...
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32 views

Filter by group with pfctl

I'm using this example on 10.10.5 but I can't get my packets filtered correctly using pfctl: dummynet out proto { tcp,udp } all group throttle pipe 1 Based on the man pfctl (see here): group &...
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0answers
13 views

Problem with configuring pfctl

I am trying to set up banner checking in MASSCAN. Link to GitHub page The problem is that MASSCAN contains its own TCP/IP stack separate from the system you run it on. I need to firewall the port ...
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0answers
10 views

Block outgoing Internet connections from an application [duplicate]

How can I block outgoing Internet connections from a specific application? I can block incoming connections using System Preferences > Security & Privacy > Firewall, but it doesn't appear to have ...
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1answer
70 views

Only HTTPS websites working otherwise I receive ERR_CONNECTION_REFUSED [duplicate]

I am facing annoying problem of only HTTPS websites working on my Mac (in all browsers). I can only visit Google, YouTube, Facebook, Yahoo etc. So far, I tried following: Websites shows error of: ...
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1answer
16 views

Is there any way to look at and modify the Application Layer Firewall via the command line?

We have an issues where an application changed it's service name and UAC prompted users to allow or deny, and a lot of users clicked deny. If users go in to system preferences, security, firewall and ...
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0answers
50 views

PF / IceFloor - Redirecting a service / port to a specific IP

What I'm trying to do is redirect all requests to a certain service or port to a specific IP address with IceFloor as the frontend for PF. In the example I'm posting en1 is my only enabled network ...
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34 views

OSX Firewall 10.11 keeps getting turned off

For some time, several months at least, my inbuilt Firewall (OSX 10.11.x Application Level Firewall as available via Security and Privacy Preferences) keeps on getting turned off. It will be on for "...
2
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1answer
70 views

All HTTP requests get ERR_CONNECTION_REFUSED, HTTPS works - How to troubleshoot?

Trying to open a http website on any web browser (event telnet) gives a ‘ERR_CONNECTION_REFUSED’ or ‘connection timed out’. However, the same sites can be opened using https. I tried doing a ...
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1answer
111 views

Which built-in tools do Little Snitch-like applications rely on?

Little Snitch is a well-known piece of software that allows Mac users to block outgoing connexions from a specific app. Now, whenever I ask how to do the same with built-in OS X tools, I get an ...
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4answers
873 views

What is the “akd” process, and do I need to allow it to connect to the internet?

I use Little Snitch as a Mac OS firewall. Usually, it's fairly clear to me what needs to connect to the internet and what doesn't. However, I can't figure out what akd is or does, and why it needs to ...
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1answer
21 views

Serve Application from my Mac over LAN

I am trying to serve an application I'm developing over the LAN at work. I'm doing this using Apache and this is working fine locally, but when I try to access from another client on the network the ...
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0answers
35 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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0answers
12 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
54 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, cba,...
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0answers
46 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> <key>...
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1answer
46 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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107 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 ...
3
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1answer
203 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 -> 127....
2
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1answer
243 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 ...
3
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1answer
2k 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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1answer
36 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 ...
3
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2answers
143 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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0answers
36 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
1k 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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1answer
51 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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125 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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2answers
96 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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391 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 ...
3
votes
1answer
1k 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
405 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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63 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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32 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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0answers
161 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
97 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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1answer
408 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
103 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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2answers
3k 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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1answer
75 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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342 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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60 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
545 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 -> ...
2
votes
1answer
409 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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318 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
60 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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0answers
118 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 ...
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0answers
372 views

How can I configure fail2ban for use with OS X

I've seen instructions for configuring fail2ban on BSD using pf but I'm not sure how these can be adapted to configure the fail2ban rules that ship with homebrew to configure Yosemite's firewall for ...
3
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1answer
5k views

MacOS X - iptables?

Where is iptables in MacOS X? I'm running Yosemite 10.10.5 (14F27) and it seems to be missing. If it's not actually native to OS X, what's the best way to install it for this operating system? If for ...
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2answers
233 views

OS X: How to lock down these frivolous protocols!

I ran a port scan on my Mac (OS X 10.9.4 if its relevant) and i realised all these random protocols with next to no explanation on the internet. 2 of the most unusual protocols include ndl-aas and ...