Questions tagged [firewall]

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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62 views

MacOS Firewall: Program grayed out, can't be added to Firewall Options

In MacOS Monterey (12.0.1), I am running Python 2.7 from an Anaconda virtual environment. Each time I run the Python script, I am asked if I want to accept incoming network connections: I have tried ...
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Stealth mode being reported as both on and off

MacBook Pro 16 (2019), Big Sur 11.6.1 System Information is reporting that Firewall Stealth Mode is off, yet System Preferences is reporting that it is on. $ system_profiler SPFirewallDataType ...
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Modifying tcp packets going out on a specific port

I am newbie with pf. I want to modify all outgoing TCP traffic having destination port 8001. For that, firstly, I wanted to use pf to redirect all the TCP traffic at en0 with destination port 8001 to ...
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51 views

MacBook blocks all incoming connections, even when firewall is turned off

I moved to a new MacBook (High Sierra initially and BigSur now) and all incoming network connections are blocked on the new MacBook (restored from the backup couple of weeks ago). On an old one ...
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Monitor VM network with Little Snitch

I've upgraded to Big Sur (yep, late to the party), VM Ware Fusion 12 and Little Snitch 5. I get that kernel extension are no longer valid and VM Ware now uses the Apple network API. Previously I could ...
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68 views

Hybrid-Analysis.com indicates macOS built-in file is contacting a malicious website

I'm wondering if anyone knows why this /System/Library/StagedFrameworks/Safari/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.Networking.xpc is connecting to adriver.ru ? This is according ...
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125 views

How to dynamically add anchors on startup for apple pfctl without editing system pf.conf

There are a few answers on using pfctl on os x, but none really give a nice clean way to make an anchor and have it loaded on startup, or to allow programs to hook in and dynamically update / replace ...
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45 views

How to make XQuartz listen to port 6000?

I have installed XQuartz 2.8.1 onto macOS Catalina 10.15.4. Now I can use ssh -X myremotehost and do xcalc & there. But the -X option appears to work too slow. I am using a LAN and would like to ...
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1k views

MacOS Firewall: Best practice to Allow or Block "Incoming connections" for applications?

A relatively large number of my Mac applications causes the MacOS Firewall to ask whether to allow or block "Incoming connections" (System Preferences > Firewall > Firewall Options). ...
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How can I stop the macOS firewall from blocking Django server (Python)?

For several years I have been regularly using Python's Django framework and running its web server for development purposes on my local machine. I took a break over the past year and am now returning ...
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pfctl: Duplicate signature for

What would cause pfctl to output a bunch of errors regarding duplicate signatures to stderr when run as a daemon using launchd under /Library/LaunchDaemons, but not when run manually from Terminal? ...
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349 views

Macbook Pro doesn't accept any incoming connections - Firewall disabled!

My MacBook Pro running macOS Big Sur 11.3.1 doesn't respond to Ping, SSH, and Remote Access. What I tried so far: Made sure "stealth mode" was disabled on Firewall Disabled the Firewall ...
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133 views

ARDAgent present in firewall settings as "Allow incoming connections"

ARDAgent present in firewall settings as "Allow incoming connections." I googled it and found out that ARDAgent is used for Apple remote desktop but don't have Apple remote desktop. Can ...
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How to route all outbound TCP to localhost:8080 with pfctl?

I'm looking for an updated (Big Sur) MacOS alternative for this iptables command: linux iptables sudo sysctl net.ipv4.ip_forward=1 sudo iptables -t nat -I PREROUTING -p tcp --dport 55 -j REDIRECT --...
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349 views

Traffic of different Apps in Little Snitch with enabled VPN? What is the meaning?

So, I am trying to understand my VPN connection observing the traffic in Little Snitch. My VPN is connected and I can see its connection to the server and the amount of data that is transfered. ...
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1answer
20 views

How to get rid of firewall asking when developing a program?

When you develop a program you compile a web server as an executable server. When you run it the firewall would ask "Do you want the application 'server' to accept incoming network connections?&...
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246 views

macOS Catalina does not allow incoming connections from local network. Firewall is down

I starting facing this issue some days ago. Even when the firewall is down, I can't reach my mac from my local network. Ping is not responding neither. Some test I've done: From my console nrossi@~$ ...
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37 views

Determining/associating the log subsystem for apps installed via package managers

I've watched this highly informative talk on the unified logs and been reading whatever documentation or blog posts I can find on the subject, but I haven't found or don't understand how to link an ...
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216 views

Unity Fails to Launch: Package Manager Error most likely due to a proxy or firewall configuration

My Mac (v10.15.5) cannot launch Unity regardless of the versions used, and attached is the error message saying it is about Package Manager: Unity Package Manager Error Could not establish a ...
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1answer
102 views

How to open firewall from terminal

I am developing a go app on a server(mac-mini) where I connect via ssh. I restart the app many times: go run main.go Problem is, that I dont have access to the graphical ui - "Firewall Options......
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109 views

Can the transparencyd daemon traffic be dropped without adverse effects?

Based on what the transparencyd daemon is for (explained here) I have the impression so far there is no harm in blocking that traffic. Until now, every time my firewall drew my attention onto that ...
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3k views

Pop-up Appears then dissapears at MacOS Boot: Do you want the application "mediasharingd" to accept incoming network connections?

I'm running MacOS Catalina 10.15.7 (19H114) on a Macbook Pro 11,3 15" mid 2014. Every time I log into my Mac, after about 5 seconds, I get a popup that says... Do you want the application "...
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macOS Big Sur Macbook does not respond to ping on neither ethernet or WiFi

I cannot ping my mac that is running macOS Big Sur 11.0.1 It seems to receive the ping packages but does not respond to them, and yes: Firewall is off I have tried turning stealth mode on and off I ...
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34 views

What port does Handoff use?

It seems that my firewall blocks some Handoff features. When I turn off my firewall it all works as expected. What port does Handoff use?
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569 views

spctl "command not found" on Recovery start (mac OS Big Sierra)

I've just updated to macOS Big Sur. The firewall I use, Little Snitch doesn't work with Big Sur natively, and you have to do some stuff (they explain the thing here https://obdev.at/support/...
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368 views

How do I close a port on a Mac?

I was wondering if someone could tell me how to close a TCP/UDP port on a Mac completely. I don't want to kill a process or anything behind it. I want the port to be closed off completely. Thanks, PN
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243 views

Starting `pf` Firewall at System Startup

I have a particular machine that I keep buttoned down very tight. Only a few specific ports/protocols are allowed. I have a pretty basic set of rules that work very well. While working on a different ...
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45 views

Has Catalina broken the logging into external machines?

So I've been trying to login to servers and MySQL databases recently and it seems that they all come back with either no error or no connection available errors, and I'm wondering how exactly one ...
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1answer
459 views

How do I delete xpcproxy executable from /usr/libexec folder on my Mac?

How do I delete xpcproxy executable from /usr/libexec folder on my Mac? When I dragged it to Trash, it did not delete, neither was Command+Shift+Del helpful
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Open port in firewall on Catalina

I'm trying to run a Kibana (from Elastic) server on an old Mac Mini on my local network. The Kibana instance is running successfully and I can access the UI locally and also from another machine on ...
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55 views

How to maintain a Mac protected on the Internet when any sharing is on?

Mac with Internet door closed When a Mac is connected to the Internet but no sharing is activated it is correctly protected on the Internet side. A protection situation one can check with a tool like ...
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134 views

Running some processes and not others over VPN

I'm looking to secure some apps on macOS using an OpenVPN connection. I want the apps not to work when the VPN isn't active. I can't necessarily track which servers the apps are trying to access, so ...
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566 views

HOSTS file & Little Snitch

LS 3.8.2, MacOS 10.13.6 (I'm in 'music', slowly updating). It's great having the option to modify the HOSTS file, but with Little Snitch installed it is not read. (I know the hosts file is not read ...
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2answers
263 views

Should I buy a Hardware Firewall for my Time Capsule 4th Gen Router?

For my home network, I am still using the Time Capsule 4th Generation Router, from 2011. I realized that I may have overestimated the security of this device, as it apparently does not have a Firewall ...
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3k views

MacOS Firewall: 'Do you want the application "Google Chrome.app" to accept incoming network connections?'

Earlier today, I decided to review my MacOS Catlina Firewall settings by deleting my previous application-specific settings, and handle future prompts one at a time. Then when visiting chrome://flags#...
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`Do you want the application "main" to accept incoming network connections?` pop up while running Go applications

Every time I am running Go applications on MacOs with this command: go run main.go I get this pop up message: Do you want the application "main" to accept incoming network connections? I added Go ...
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2answers
3k views

How to stop Catalina from contacting Apple servers when executing programs?

I'm a software developer and as such I build and run programs hundreds of times per day. I've noticed that since I started using Catalina, after compiling and linking there is a delay (which can be ...
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95 views

Port Blocking of OSC Messages But Firewall is Off

In my computer I am trying to receive Open Sound Control from a server running internally from an application, the address is '127.0.0.1:57110'. The problem I have is that the OSC seems to be blocked ...
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96 views

MacOS port become blocked

I have tried setting up Packet Filter on macOS 10.15.5. I develop software. I am hosting some services via supervisord. It has a user interface on port 9001 running to reset/start/stop services. ...
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3k views

How can I turn on the macOS firewall from a script

I'm setting up a new Mac Mini and I am using a script assembled from commands that I've accumulated over the years to set defaults, create directory structures, install software, and otherwise ...
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38 views

How to use pf to route this scenario

Scenario I need pf on a Mac to do this: redirecting any connections to localhost:8080 to a public domain. --> localhost:8080 --> public domain Example The public domain is hosting a nginx server. ...
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1answer
122 views

PF not forwarding incoming traffic on loopback from one port to another

Scenario I have a server listening on port 3000 on localhost. I want incoming traffic to localhost:8080 to be forwarded to that server. My set up: Server listens on port 3000; nothing listens on ...
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400 views

pf: Dynamically add rule to nat-anchor

I connect to a Cisco VPN Server and want to share that connection via wifi. Using the macOS Internet Sharing feature, I can only select one interface to share - either my LAN adapter, or the VPN ...
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1answer
745 views

How to simulate network connections / ipfw on macOS?

I would like all UDP traffic on my localhost to have 1% packet loss, 10 ms propagation delay, 10Mbit/s bandwidth. On other computers I have experience using ipfw something like this: ipfw add pipe 1 ...
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1answer
9k views

How do you close an open port in Mac?

Using Netstat (within Network Utility), I discovered an unusual IP address -- this IP address occasionally uses 9 different open ports, including ports 9998 and 9999. I also did an Zenmap scan, and it ...
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41 views

Restrict access to certain websites without VPN

So I'd like to disable some connections to certain IPs and websites without a VPN activated for security purposes so I wouldn't mess up and go to that certain website without a VPN enabled, I wonder ...
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330 views

Firewall setup for Python.app incoming connection

I am running a Python programme on my MacBook Pro (Catalina), but everytime it prompts the following information However, in the pane of Security & Privacy preferences, I have set it, How can I ...
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1answer
299 views

Does Little Little Snitch 4 block connections during login?

I have been using Little Snitch for some time now. I think the version I've started to use the program with, was 3.5. Anyway, I remember seeing notifications from Little Snitch about connection ...
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460 views

How to make Little Snitch only block the upload traffic, but not the download traffic? [closed]

I didn't find a way to do that, please help!
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55 views

How do I trigger Appstore check for app updates manually?

I'm using a firewall and by default, everything, including checking for updates is blocked. In some situations, I'd like to disable the firewall and trigger such checks manually. How do I do that?

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