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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Open port 8888 for HTTP traffic from local network

I have my OS X 10.9.3 Application Level Firewall turned on (Firewall: On in System Preferences | Security & Privacy with Firewall Options: Block all incoming connections). ipfw show lists a ...
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160 views

Set DSCP/TOS IPv4 header for certain packets

I'm trying to set the value of the DSCP/TOS field for certain outgoing packets (for example all ACK packets) for all applications. I've looked through the pfctl/pfconf.org and ipfw docs/manpages but ...
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1answer
158 views

CrashPlan requests network connection on startup

Since upgrading to Mavericks, CrashPlan requests incoming network connections each time my MBP is restarted. I always click "Allow" and I've ensured that my firewall settings allow it, but I still get ...
2
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1answer
922 views

ntpd and incoming connections on OS X client?

I recently received a dialog box on my MacBook Air (10.9.2 Client) asking "Do you want the application “ntpd” to accept incoming network connections?". I have OS X's firewall enabled. Now, my ...
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1answer
720 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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2answers
626 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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0answers
54 views

How can I allow a “development” program through the firewall?

I have an application (java) that I compile/run through netbeans, I want to access it from a different computer. Opening a port might be the best solution, though if so I'd like to be a little more ...
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1answer
241 views

Free firewall and network monitor Application like the LittleSnitch? [duplicate]

I am searching for a good free firewall and network monitor as the littlesnitch but I can't pay for this app. I want a firewall that will protect me but more of that to monitor any connection in or ...
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2answers
2k 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 ...
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2answers
47 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 ...
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1answer
449 views

Blocking internet access for a specific application on Mac OS X

How can I block internet access to a specific application in Mac OS X? I need this to be done from the command line and hopefully use the ipfw terminal command. Specifically I am looking to toggle ...
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3answers
222 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 ...
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2answers
1k 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 ...
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73 views

CalenderAgent: howto allow connection only if needed?

I use LittleSnitch, and there i can see that CalenderAgent makes still connection to Google and iCloud even iCal is closed. Because of several reason..., I want to allow CallanderAgent making ...
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1answer
1k 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, ...
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119 views

MacOS 10.6 firewall treats IPv4 and IPv6 packets differently

I'm develping a wireless MIDI controller. When connecting to a Mac running Mac OS 10.6, everything works fine, so long as the controller attempts to connect to the Mac using IPv4. When using IPv6, I ...
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631 views

Mail.app can't connect to network (can't reach servers)

One day I woke up and could not use my Mail.app anymore :( Mail can't connect to any my account related server, either POP, IMAP or SMTP Why ? I don't know. In Log file I see that: When I try to ...
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2answers
777 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 ...
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2answers
806 views

No Jailbreak Firewall for iOS (iPhone) for iOS 7

Is there a non jailbreak firewall for the iPhone or is there some way to set one up, somehow?
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1answer
1k views

OSX Firewall: Forwarding Ports & Ignoring Non-Local Requests

On my production Debian server I use this to forward requests that come in to port 80 to a non-root process running on port 8080: sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j ...
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2answers
8k 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 ...
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1answer
1k views

Migration Assistant fails on FireWire Mavericks-to-Mavericks migration

I have the following setup and am attempting the use Migration Assistant over FireWire: Source machine: Early 2009 24-inch iMac running OS X 10.9 Destination machine: Latest MacBook Pro Retina ...
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2answers
164 views

Pf firewall logging

I have pf configured and working with rule sets that are logged. Where is pf logging to? How do I check these logs? How do I configure them?
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2answers
357 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 ...
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54 views

Prevent data on unsecured wireless, until VPN is connected [duplicate]

There's a lot of good advice around about avoiding connecting to unsecured wireless networks, and using a VPN (for all traffic) if you absolutely must use one. What seems to be missing from this ...
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4answers
502 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 ...
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1answer
376 views

Block access from WAN but not from LAN

I have an OSX Lion box behind a router (firewall on in the router). On the OS X, if I switch the firewall on, I'm unable to access the web server running on this box from outside the network (i.e. ...
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1answer
208 views

How to isolate apps from the internet?

Can I completely isolate apps on mac from the internet, without installing any additional software ? I need a sort of firewall to isolate them thanks
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1answer
94 views

Sharing screen with Messages.app on Mountain Lion

Both computers are running OS X 10.8.4 When trying to initiate the screen sharing feature, the other computer gets the request, then clicks "Accept" but thats as far as we get. Then we see this: I ...
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0answers
454 views

What app is this ScannerEventWatcher.app?

After enabling the Firewall, I got this message: Do you want the application “ScannerEventWatcher.app” to accept incoming network connections? Clicking Deny may limit the application’s ...
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2answers
1k views

Is it possible to block a specific IP from attempting to connect to screen sharing?

I have noticed for some time that the shared screen icon flickers on and off on my menubar every couple of minutes (MacBook Pro, MAC OS X 10.8.4). I thought it was a glitch or a bug. I've checked the ...
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1answer
959 views

How to configure client OS X VPN (L2TP) connection so you do not loose access to intranet?

I am looking for a solution for configuring the VPN on OS X so you do not loose access to internal network. In fact I want to use the VPN only to enable access to different external services that ...
3
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1answer
377 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 ...
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1answer
128 views

How can I permanently suppress the firewall access prompt while developing a server program

I have a server process that I am developing that opens listening TCP sockets. Each time that happens, the firewall opens a dialog with the text "Do you want the application “server” to accept ...
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2answers
2k views

Firewall with application rules for iPad

I've read some other topics about not needed firewall for iPad's, but I'm searching the other way of security or (more important) to help my budget. I need firewall that has incoming/outcoming rules ...
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1answer
125 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 ...
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31 views

Enforcing firewall (native or 3rd-party)

We're currently doing PCI compliance, and one of the requirements is that mobile devices that have access to systems involved in processing card data have personal firewall software installed which ...
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330 views

Can someone help me with errors in my pf.conf file? OS 10.7

I keep getting errors about the order of my rules and that there are syntax errors in my pf.conf file, and after troubleshooting for days, I thought I'd ask for some help. Please take a look and let ...
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2answers
114 views

Application asks to allow incoming communications but is already allowed in firewall preferences

One of my login items is called FontAgent Activator.app Each time I restart, I am prompted to accept incoming network communications for this app. However the app is already listed as allow incoming ...
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1answer
212 views

Firewall window pops up then vanishes

For about the last month, I've had the Firewall Accept/Deny incoming connection window pop up at semi-regular intervals. I have not, however, been able to identify the cause. Taking a look at the ...
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0answers
2k views

FTP: active vs. passive, command line vs. browser

Here's a weird one for everyone. I'll use AskDifferent because my test bed is on a Mac, but I don't know that the underlying issue is specifically Mac. My Mac is behind a NAT wall. Let's call my ...
3
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3answers
11k 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 ...
3
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1answer
17k 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.
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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 ...
10
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2answers
2k 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 ...
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1answer
91 views

How can I disable the firewall on OS X after forgetting how I set it?

I have enabled an option on my mac to ask for permission every time I open an network application, But I can't seem to find out how to turn it off. Where would I disable the below dialog?
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1answer
40k 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
3k 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 ...
5
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1answer
311 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 ...
2
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1answer
434 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 ...