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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16 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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20 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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11 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
44 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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25 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
33 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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0answers
58 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
129 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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1answer
156 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 ...
2
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1answer
522 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
33 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
113 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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28 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
667 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
32 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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104 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
73 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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276 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
973 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
218 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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54 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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29 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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122 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
71 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
113 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
83 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
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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1answer
57 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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50 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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297 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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54 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
487 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 -> ...
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1answer
348 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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225 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 ...
0
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1answer
57 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
102 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
315 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
4k 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
175 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 ...
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44 views

Add permanent Allow rule to Firewall without “Allow signed content…”

I'm working on an OS X 10.5 PowerMac machine. I want to add a permanent Allow rule for an updated OpenSSH server located at /usr/local/sbin/sshd. I have a firewall rule for it in the Firewall App, but ...
4
votes
1answer
127 views

What are the services Apple's Firewall considers essential?

I'm trying to determine what Apple's Firewall considers essential services. Apple's Firewall has the following settings available: A search of Apple's site does not reveal a support document on the ...
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0answers
82 views

Enable `ipfw` port-forwarding on startup

For older versions of Mac OS X (Mountain Lion), port-forwarding is done with the ipfw tool. (In later versions, use PF tool.) For example, the Apache Tomcat web server listens by default on port ...
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3answers
2k views

Blocking incoming hostile traffic dynamically with PF and fail2ban on OS X

The bigger picture is that I am trying to dynamically block/unblock IPs using fail2ban 0.8.14. I have been following an old guide for OS 10.5 with doesn’t include PF. I think I’ve configured ...
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1answer
280 views

What is the Correct 'pf' Syntax for an 'iptables' Port Redirection Rule

I am looking to implement a rule like the following iptables rule on my Mac, to redirect traffic from my development workstation (hosting a development copy of a Ruby on Rails project) to another host ...
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35 views

OS X: enable firewall only on Wi-Fi?

When I'm connected to my local LAN via thunderbolt, I don't want the firewall on. When I'm connected via Wi-Fi, I want the firewall on. I can't figure out how to make that happen.
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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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1answer
48 views

How to share over ethernet but not over wifi [duplicate]

Running OSX 10.10.3 The office LAN is wired, the guest LAN is WiFi. I need to be on both at the same time. I want to be able to accept connections from the office LAN, but I want to limit access to ...
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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
1k views

VNC connection to OS X Yosemite 10.10 not working with Firewall enabled.

I've been connecting to my Mac with the iOS VNC app to monitor a process remotely, and noticed Firewall was turned off in Security & Privacy. So of course I turned it back on, and tried to ...
3
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1answer
332 views

Alternative for `fail2ban` on my server running OS X 10.6.8

I have dedicated my old MacBook as a home server. It runs, among other stuff, the following services: Webserver (Apache, PHP, MySQL) i.e. OwnCloud/WebDAV Torrent client SSH server VPN Some game ...