Firewall Block incoming connections fails

Whenever I'm on the road or at clients loactions I set my firewall to block all incoming connections.
The explanation of Mac OS X is:
So it shouldn't matter if at the Sharing preferences you have enabled Screen or file sharing, which I have turned on, to be able to transfer files at home.
If "Block all incoming connections" is enabled, nobody should see you have any sharing options enabled. I always understood this is a sort of override.
Alas, this seems not the case. My laptop is actively promoting itself as a VNC enabled computer, while block all incoming connections is checked. Unchecking the screen sharing in the sharing preferences immediately has effect on this and stops VNC braodcasting.
Who knows more about this? Is this a bug or undocumented / wrongly documented feature?
Kind regards,
Roeland

PAHU wrote:
Roerei wrote:
Mac OS X explicitely states that "all sharing services" will be blocked.
And they are blocked. With this setting enabled, you cannot connect to the Mac from a remote computer.
What it does not say is that enabling this setting will stop the Mac from being advertised. If you want this then you will need to turn off File Sharing. This will stop the Mac from being seen on the local network.
So in summary, if you want to stop your Mac from being seen on someone else's network you are connected to, then disable File and Screen Sharing. Or trust that with the "Block all incoming" setting enabled, no other user will be able to connect to your Mac even though they can see it.
This is just stupid. Why advertise a service which is blocked? That is just plain dump and not very security minded. If you block a service, you also should not advertise that service. Especially in the firewall preferences checking that box greys out all other options, which gives you kind of the impression that you are stealth.
So you might be right, but it is just wrong.
Roeland

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Hello,
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ALTHOUGH
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I was fighting with this 'till now.
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Remove it from the list in Firewall preferences.
Disable Firewall.
Reboot.
Install OSX 10.10.2 combo-update.
Reboot.
Add manually the ARDagent.app to the Allowed Rules in Firewall from /System/Library/CoreServices/RemoteManagement
Enable Firewall.
Update to ARD Client v3.8.2 v1.1 from the App Store.
Reboot.
Here, the annoying firewall message has gone. I hope it will work for you too.
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Solved!
Go to Solution.

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Firewall in set access mode let "allow incoming connections" without me

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What is the fix for some applications repeatedly asking permission to accept incoming connections?

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This is a comment on why you might, or might not, want to use the built-in Application Firewall.
The firewall blocks incoming network traffic, regardless of origin, on a per-application basis. By default it's off, and when turned on, it allows applications digitally signed by Apple, and only those applications, to listen on the network. It does not block outgoing traffic, nor can it distinguish between different sources of incoming traffic, nor does it filter traffic by content.
No matter how it's configured, the firewall is not, as some imagine, a malware filter. If that's what you expect it to do, forget it. All it will do is bombard you with pointless alerts.
Consider some scenarios in which you may expect the firewall to be useful.
1. You enable file sharing, and you allow guest access to certain folders. That means you want people on your local network, but not outsiders, to be able to access those shared folders without having to enter a password. In the default configuration, the firewall will allow that to happen. The router prevents outsiders from accessing the shares, whether the application firewall is on or off. But if your computer is portable and you connect it to an untrusted network such as a public hotspot, the firewall will still allow access to anyone, which is not what you want. It does not protect you in this scenario.
2. You unknowingly install a trojan that steals your data and uploads it to a remote server. The firewall, no matter how it's configured, will not block that outgoing traffic. It does nothing to protect you from that threat.
3. A more likely scenario: The web browser or the router is compromised by an attacker. The attack redirects all web traffic to a bogus server. The firewall does not protect you from this threat.
4. You're running a public web server. Your router forwards TCP connection requests on port 80 to your Mac, and the connections are accepted by the built-in web server, which is codesigned by Apple. The application firewall, still configured as above, allows this to happen. An attacker hacks into the system and tries to hijack port 80 and replace the built-in web server with one that he controls. The good news here is that the firewall does protect you; it blocks incoming connections to the malicious server and alerts you. But the bad news is that you've been rooted. The attacker who can do all this can just as easily turn off the firewall, in which case it doesn't protect you after all.
5. You're running a Minecraft server on the local network. It listens on a high-numbered port. You, as administrator, have reconfigured the firewall to pass this traffic. An attacker is able to log in to a standard account on the server. He figures out how to crash Minecraft, or he just waits for you to quit it, and then he binds his own, malicious, Minecraft server to the same port. The firewall blocks his server, and because he's not an administrator, he can't do anything about it. In this scenario, the security is genuine.
6. Here is a more realistic scenario in which you might have reason to enable the firewall. Your MacBook has sharing services enabled. You want those services to be available to others on a home or office network. When you're on those networks, the firewall should be off. When you move to an untrusted network, you can either turn off all the services, or enable the firewall with a non-default configuration to block them. Blocking is easier: one click instead of several.

Firewall blocks service when started from launchd

I run lighttpd (installed from MacPorts), and it is binded to port 80. I am trying to make the Leopard Firewall play nice with it.
The firewall is set to 'Set access for specific services and applications', and the lighttpd binary is on the list of applications set with 'Allow incoming connections'.
When I start the service manually, it works fine, and the firewall allows outside connections to port 80. However, I use the launchd script shipped with MacPort's lighttpd to run lighttpd on boot.
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Any idea how to get the firewall to play nicely with lighttpd when started via launchd?

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Confused with Firewall Blocking

I have my Firewall configured to "set access for specific applications and services". Now, my understanding here is that if I set an application to "Block Incoming Connections", that application should not be able to receive any data from the network or internet. However, when I actually try this, the blocked application seems to have no trouble at all receiving data (for example, checking for updates over the internet). Can anyone explain this feature to me?

{quote}
Ok, try this, Another user named Noisyboy2006 posted for me...
"Apple have dumbed down the terminal to make osx more secure. As you've discovered you can no longer open a port from preferences. You can however use terminal.
The synatax of the command is:
sudo ipfw add allow udp or tcp from port to port
For example to open port 80 for TCP you would type:
sudo ipfw add allow tcp from 80 to 80
to see a list of open ports type:
sudo ipfw list
you'll see something like this:
33300 deny icmp from any to me in icmptypes 8
33400 allow udp from 0.0.0.80 to 0.0.0.80
33500 allow tcp from 0.0.0.80 to 0.0.0.80
What a useless tool for the average user. Try to explain this to your Mom or an out of state client, over the phone. Even if they get it right, it doesn't fix or configure the NAT firewall in the router.
Any program or system that requires Terminal is not for prime time on MacOS. System administrators will eat this up, but end users would and should just tell Apple to fix this mess. The Vista firewall and the 25 page "white page" description is the same mess.
Just get a good effective firewall like Little Snitch, turn off the Apple firewalls and get some work done. If you're lucky, you will be able to open the required ports in your router and deal with rule based programs with a decent interface and the ability to block out-going ports.

10.6 Server's Firewall Blocks It's Own Internet Connection

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So here's what happens. The firewall in 10.6 server will "freak out". It will be running normally, then suddenly it will go haywire and block everything. And I mean everything. My computer won't even be able to get an IP via DHCP. Everything is blocked. But as soon as you stop the firewall, everything works normally. You can even modify the firewall rules, and set it up so there are NO deny rules, and EVERY connection to and from every host is set to allow. And the firewall still blocks everything. This is the same exact thing that happened 2 years ago when I first tried to run 10.6 Server on my mini. The difference is that back then, this would happen either immediatly, or within a day. This time around, with 10.6.8, it took about a month before suddenly, without any provocation, all internet connections stopped.
I've had this happen on multiple computers. I don't do anything special, I just set up a basic firewall scheme where everything in the LAN range is allowed, and everything from "any" is allowed only to service ports I'm running. The basic gateway setup. Now I was running 10.6 Server on my laptop (for netbooting) and it would do the same thing. But because my laptop wasn't acting as a gateway, I could just turn the firewall off (you need the firewall for NAT). My mini server IS acting as a gateway, as was another mini I set up for a client of mine (that eventualy I changed over so they were running off an airport, and the mini server was just a client. But I don't want that setup at home, I want my mini to be the router).
I have verizon Fios internet. 25/25, it's great. The ONT is in my basement, and it's plugged into the same fused outlet as our freezer. From time to time, when the power goes out, it trips that breaker and the outlet goes dead. My itnernet is gone and I have to go reset the outlet. Once I do, my mini won't get an IP from Verizon until I reboot the mini. Not once. Not twice. Usually 5-10 reboots, and suddenly it will get an IP. I always assumed this was a verizon problem. Until I read someone else's post about this same problem. Turns out, that's the firewall blocking DHCP again! If you turn the firewall off, you don't have to keep rebooting, it will grab an IP right away.
At least I'm not crazy! So what is going on here? Does anyone have any idea what is going on with my firewall, or how I can fix it?
Lastly, after 4.5 hours of complete inability to get an internet connection with the firewall on, it just started working again. I now have fully functional, normal internet. I find it hard to believe 10.6 has a firewall that is simply broken. I find it even harder to believe I'm imagining things, or that I've had fluke after fluke. Something is going on with 10.6 Server.

The DNS skapegoat just doesn't make sense.
Why would "improper" DNS cause OS X's firewall to block all network connections? Even the server's ability to make it's own DHCP connection?
As far as a router, I don't want to use a cheap unreliable residential router. I have a home file server that, aside from running 10.6, makes a super reliable router. And port mapping aside, OS X Server's DHCP server is great to use. Rock solid. It makes no sense to run a cheap residential router when I have a home server. Then every 6-18 months, I get to deal with that router slowly failing, as my internet connection gets slower and slower. No thanks.
So back to this firewall issue. I've talked to Apple aobut this before, and they give the same generic "DNS has to be right" answer to basically every problem I've ever had with 10.6 Server (hinting at endless CalDAV problems). But no one has every explained what that specifically means, or how something like wrong DNS (whatever that even means) can cause the firewall to block everything. This just makes no sense to me. And this especially does not explain why, after 10 reboots or so, everything just magically starts running normally.
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Also my IP through my ISP is dynamic, and that isn't going to change. So yes, I am trying to use OS X Server as my router on a dynamic internet connection. I've been doing this since the days of Mac OS X Server 10.1. Only 10.6 has had any problems at all.
So really, "10.6 is more picky about DNS" isn't an answer to this problem. Or, at least, it's not a sufficient answer. I need much more information than that.

Windows Firewall blocking connections to devices

Hi
I hope this is the right place. I am having a few problems with the Windows 7 firewall when connecting to embedded devices.
I currently have a Windows application that connects to 4 embedded devices via TCP but Windows firewall only seems to allow a connection with 2 of the devices even with exceptions setup on the firewall.
The devices are connected to their own ethernet adapter in the PC '192.168.1.32'. Each device has it's own IP Address but uses the same port.
The network comes up as a 'public' network and with the firewall for the public profile enabled only connections to the first 2 devices are established.
If I turn the firewall off for the public profile connections are made to all devices.
Also if I give each controller a different port number connection is again made to all devices.
I was hoping that someone could tell me if this is expected firewall behaviour or at least be able to give me a clue as to why the firewall affects the connections.
I know I can get round the problem but I wanted to at least understand why this is happening.

You can check existing rules using this command (using
admin command prompt)..
netsh advfirewall firewall show rule name=all
and try to understand what is blocking your ports and try to create exceptions accordingly....
Expected firewall behaviour is to open necessary ports for a software by making exceptions in the firewall rules by that software while installing.. For some reason if it fails you may have to manually create exceptions.. rules etc..
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Blocked outgoing connection /Firewall?

So I have application that I blocked before from incoming and outgoing connections. Today when I allow it to communicate by turning on "allow connections" in firewall pref pane it doesnt want to connect to update server, I turned off firewall and the same problem persists. It feels like it stored some files and doesnt let me communicate to its server no matter what.
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Mac does not appear to be accepting any incoming connections (firewall off)

Hi, all.
I've been desperately trying to get my PS3 to talk to my Mac with zero success. I've tried a large range of software, from Twonky to MediaTomb to PS3MediaServer to EyeConnect and to MediaLink. All fail to recognise the PS3, and vice-versa.
Firewall is turned off, router appears fine (seems to work with other computers on network), but the problem persists.
The apps listed above are not the only ones which will not receive incoming connections from the LAN: VNC does not appear to work, and Transmission bittorrent client is telling me that my ports are on 'stealth' (though this could be a router issue).
If you think it may be a router issue, my router is a DG934G router provided by Sky Broadband.
I've recently re-installed the OS (harddrive failure, replaced), but the problem won't seem to budge.
Thanks very much in advance. I look forward to hearing your insight and wisdom.

tbotn wrote:
nerowolfe wrote:
William Kucharski wrote:
You must have a third party application or some startup files in place that specifically enable ipfw on your system, as the firewall in Mac OS X Leopard no longer uses ipfw. (ipfw still exists, but you must configure and start it manually.)
Could you have set up ipfw in a non-standard way on Tiger and those scripts are still being run now that you're using Leopard? Have you set up ipfw using a third-party app
Good catch. I suspect that this is the problem.
Not being extremely familiar with ipfw, would the command
sudo ipfw disable firewall
do the trick?
Or at least verify that it is or is not the issue?
Hurray! My faith has been restored in all things networked! The command "sudo ipfw disable firewall" seemed to do the trick.
I've just tested Twonky and VNC, and for the first time ever, they're working! Next is to try streaming to the PS3....
Thank you all
Actually the real credit goes to William who discovered the problem from your log report. I merely followed up on his surmise and posted the firewall off command for you to try. However, the important thing is that your system is now working properly, which, after all, is the primary purpose of these forums.
Enjoy

Firewall Block incoming connections fails

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