Firewall - stealth mode connection attempts from AEBS to computer

Console log is packed with Info messages realted to connection attempts from AEBS router. Is that normal?
also, system profiler states: Firewall Logging: No / Stealth Mode: No. Why the discrepancy?

R C-R wrote:
I suggest not taking Mr. Lambert's "bad design" commnets too seriously.
AFAICT, the string "bad design" does not appear in the post I referred to. Please do not chastise Terry Lambert (whoever he or she may be) for someone else's sins. If anyone said 'bad design', it was I.
he seems to have confused the IP addresses of two different network devices (his Mac & his Airport router) & suggested loopback
No, he didn't; you misunderstood. What he is saying is that his network device (Airport, or, en1) is talking to itself through the router instead of through loopback.
He also seems to have concluded that UDP's lack of a handshake protocol makes it a "connectionless" protocol, which makes no sense
Terry Lambert was correct; you may have misunderstood the technical term in question. For instance, a quick look in Wikipedia reveals that,
"In telecommunications, connectionless describes communication between two network end points in which a message can be sent from one end point to another without prior arrangement. […] Internet Protocol (IP) and User Datagram Protocol (UDP) are connectionless protocols." (The stress is mine.)
But Wikipedia is not always to be trusted. We are not a bunch of techies here, so I'll turn to an easy, plain-language reference:
"A connectionless protocol doesn’t go to the trouble of establishing a connection before sending a packet. Instead, it simply sends the packet. TCP is a connection-oriented Transport layer protocol. The connectionless protocol that works alongside TCP is called UDP." (The stress is mine.)
Lowe, D. (2008). Networking all-in-one desk reference for dummies, 3rd edition. Indianapolis, IN: Wiley Publishing, Inc. ISBN 0470179155, p. 31.

Similar Messages

Stealth mode connection attempts? Reason for Open DNS in router settings?

Console is giving me repeated messages (many times per minute) that read
"Stealth Mode connection attempt to UDP xxxx from 208.67.222.222:53"
That's a little scary to the uninitiated! I've done some rummaging here and across the net on this. I understand little of what I found or how to stop this. I understand that the 208.67.222.222 is Open DNS related. I was glad to discover that as I originally thought some malicious computer somewhere was trying to gain access to my MacBook Pro. I thought I'd delete the DNS servers to see if that would help, but they are greyed out in the Preferences--Network--DNS panel and cannot be removed.
From what I've investigated, those Open DNS servers are set in the router. I know how to change or delete those, but maybe I shouldn't. In fact, maybe someone can remind me why I put them in there in the first place (years ago). I vaguely recall some advantage to using Open DNS (faster?), although I'll confess that, of late, too often mistyped web addresses go to an Open DNS page, which is a nuisance.
In any event, I'd like to do something that would stop the stealth mode "attacks". While I'm sure I could ignore it, maybe it's eating up some browser or network time. It also seems odd that it would go on and on!

Thanks for some info on this. Should I only see it then, when I'm in a browser? Or, when wi-fi is on? I'm assuming that the Mac may be checking what time it is, although it seems a little too frequent for that! (3 times a minute? Well, maybe that's about right, but then Apple and Open DNS should coordinate so that this message doesn't show up.)
I did find this: http://forums.opendns.com/comments.php?DiscussionID=1785
Does that make sense? It's completely benign? And doesn't waste CPU cycles?
One problem with all this stealth mode logging is that it fills up the Console message window! It thus means that there is gobs of stuff I have to wade through to see if there really is something going on from the outside!
I did find two oddballs in there (I don't think they were open DNS as they weren't 208s), so the firewall is doing something.

Ipfw: Stealth Mode connection attempt to UDP...

Hi all,
I recently encountered internet slow down at home. I connect to internet using a wireless router, which has been used for almost a year without any problem. The router has WEP setup and MAC address filter enabled.
When I open the firewall log, I found that my router is keep using different ports (from 6355 down to 2063), trying to connect the port 137 of my Mac Mini. I have checked that port 137 is related to NetBIOS. The following is extracted from the firewall log (with my host name masked).
May 18 00:46:54 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2058
May 18 00:47:03 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2059
May 18 00:47:06 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2059
May 18 00:47:18 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2059
May 18 00:47:28 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2060
May 18 00:47:30 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2060
May 18 00:47:42 ------- ipfw: Stealth Mode connection attempt to UDP 192.168.2.2:137 from 192.168.2.1:2060
The IP address of my router is 192.168.2.1 and my Mac Mini is 192.168.2.2. I have checked from the router administrative page and can't find any other machine in my wireless network. I have no idea what's wrong with my router. Any idea please? Thanks for any advice in advance.
Best regards,
TC
Mac Mini 1.4G (PowerPC) | iPod Shuffle (2nd Gen) Mac OS X (10.4.9) 1GB

Hi Rick,
Thanks also for your response.
Do you have a network printer? (make, model, please)
Any other network devices on this LAN (Xbox, printer,
PC :o
I don't have a network printer. The little network only consists of the router and the Mac for the time being.
Do you have uPNP enabled on your router?
What make/model of router? (there may be something
common to this mfr)
No, the uPNP is never enabled. My router is Belkin Wireless G Router (F5D7230-4), which is supposed quite Mac-friendly in the market...
You say you still get the logging, even when the DSL
modem is disconnected. Weird.
Yes, it is weird.
StealthMode has been known to cause more paranoia in
some users. This 137 port scanning might be coming
from a printer or other network device on the inside
of your little network...with stealth disabled,
things would just work the way they're supposed to --
quietly. Your mac is probably secure. Your router is
probably secure (especially if you changed the admin
password when you set it up. If you've been using the
default admin password, then shame on you <wink>
I have enabled Stealth mode in my Mac. Sorry to let you down (^^V) that I am not using the default password before the discovery of the port probing mentioned and have changed to another one after reset and firmware upgrade as advised by the other poster.
Am I off-base here, fellows?
Nope, you're appreciated for any idea trying to help.
TC
(P.S. I found that the "Helpful" is used up. Sorry that I can't give you one...)

Have I been hacked??? "Stealth Mode connection attempt to UDP"

My Mac Mini has been running very slowly lately. Sometimes it takes half a minute to switch between apps, and I mean simple apps like Mail and Safari and Appleworks, not Photoshop. Photoshop is a joke it runs so slow. So I've run Onyx SEVERAL times, restarted and cleared my PRam, and nothing is helping. I also noticed it seemed like my Mini was "running" a lot (the hard drive making a noise like it was up to something when I'm not doing anything). So I looked at the cable box and the Ethernet light was flashing softly, going along with the hard drive noise. Then I downloaded something called MenuMeters and it is showing that I'm receiving data constantly - it goes between about 300B/s to 1500B/s, and sometimes it shows I'm sending too. So I opened up the System Preferences and found out that "Network Time" was enabled in the Firewall preference pane. I unchecked that but my Mini is still receiving. (I'm not on any Ethernet network or anything either.) So I opened Advanced and found that the "Block UDP Traffic" box is not checked, though the other two "Enable Firewall Logging" and "Enable Stealth Mode" are checked. THEN I opened the log file and was shocked to see 1048 lines, mostly reading ""Stealth Mode connection attempt to UDP," although once in a while I saw a few that said "12190 Deny TCP." And that 1048 is just for yesterday and today. Is that normal??? Sometimes the "Stealth Mode connection" lines are single (I mean, not to a repeating number), but sometimes they repeat two, three, even five times to the same number.
Have I been hacked? Is someone stealing our small business data? Sounds kind of ridiculous, but can't help and worry some. Or do I have a virus? I tried to google whether or not there are any Mac viruses out there, that might pertain to this, but couldn't figure out anything. What do I do? I'm not very computer savvy, other than running my apps, and don't anything about Terminal or things like that. Even as I type this MenuMeters is showing me I'm receiving SOMETHING. Yikes!
Mini Mac OS X (10.4.8)

You mention one of the applications you have been using is Appleworks - which is not supplied with Intel systems, only PPC Macs. This would tend to suggest that your mini is a G4 model. It would be helpful to know which model the system is, what software you have on it, how much free space you have on your hard drive, and what you typically use the system for.
It's interesting that you note the system seems generally busy, which would go some way to explain why it may also seem rather slow, but you haven't mentioned whether you've run Activity Monitor to see what processes are active when the system seems to be active with some task that is not of your doing. If you haven't tried this yet, do so now - and let us know what processes the system shows as active when otherwise the system ought to be idle.
To answer a few of your broad questions: When the system is connected to the internet, it's not unusual to see a certain amount of data through-putting the network connection, but in most instances this would be in the region of 100-200B/s, with occasional, brief, spikes upwards of that. In the absence of a local router that level of data is likely to be higher, since basically your Mac is managing your internet connection and maintaining a public IP address assigned by your service provider. In a system with a router, the router handles this traffic so the resultant volume of data the Mac sees would be less.
The fact you see entries in the log of the sort you describe is not necessarily an indicator of a problem. It may suggest that the system is being probed, which as Boece has said is not at all uncommon for a system with a public IP number - and is indeed why it's most common to find systems being used 'behind' a router. The router takes the public IP number, and so systems behind it are given internal addresses by the router which are not visible to the outside world. The Router then performs something called Network Address Translation (NAT) which converts internal and public addresses as needed to ensure the computer can communicate with the internet while still staying 'invisible'.
In your position, I would look to add a basic router between your Mac and your cable/DSL modem because a hardware firewall is generally more effective than a software firewall, and NAT will keep your system clear of most potential hacking risks.
As for the potential for a virus - this is a bit of a thorny subject because most will (rightly) say that MacOS is not the target of any known virus that exists in the wild. Unfortunately, that doesn't mean that it will remain that way, or that it's impossible to create malware that can infect or impact Mac systems. A good line of defense can be obtained by downloading and installing ClamXav (http://www.clamxav.com/) and setting it to examine vulnerable spots such as the desktop where files are typically downloaded or your mail folders, and using it to scan the system. Generally speaking, unlike antivirus products for Windows, this software does not consume copious amounts of CPU time (it grabs between 1 and 5% on my 1.25 G4 mini while in the background) so it's worth having around.
You also mention running OnyX several times - this is not a good thing. OnyX, like the other utilities of this type, is a useful tool in resolving performance issues, but if you find that it doesn't work when you use it once, it indicates the problem is not something that OnyX can resolve. Running it multiple times doesn't necessarily do any harm, but it does mean that macOS is continually having to build new cache files etc, which makes the system run very badly!
So....
(1) tell us about your system, the software on it and what you use it for.
(2) how much free space is on your hard drive.
(3) run Activity Monitor and tell us what it shows when the system seems to be busy doing it's own thing.
(4) download ClamXav and run it as described.
(5) get an inexpensive router and insert that into your system as described (we can help explain how to set everything up once you've got it if you need assistance).

HT1810 I am thinking of using the firewall stealth-mode application. Please tell me what disadvantages, if any, it might create for me..

I am thinking of using the firewall stealth-mode application. Please tell me what disadvantages, if any, I might experience. Thanks. John

If you live behind your home router, then it will also do nothing as your router keeps the outside world from seeing your Mac anyway.

10.6.2 - Firewall stealth mode

After upgrading to 10.6.2 the System Profiler tells me that the firewall stealth mode is turned off but in System Preferences it is activated. Is this a System Profiler bug or is the firewall not working correctly?

This has been reported before (not in 10.6.2) and has been acknowledged
as a bug in System profiler... ignore what System profiler is saying.
(A search of these forums should find you the other discussions.)
Dave

Firewall stealth mode not working.

I just upgraded my 2008 Mac Pro to Mavericks from Snow Leopard, and amazingly had not problems whatsoever.
However, I did a quick security audit using the ShieldsUp site, and was disturbed to see that only a few of the hundreds of ports scanned were stealthed, and one port (548) is wide open. The information I found suggests that port is associated with file sharing, which I have turned off, and also blocked in the software firewall. Under Snow Leopard, everything was stealthed whith the exception of a couple of closed ports.
The software firewall is set to enable Stealth Mode, and the box that automatically allows signed software to connect is unclicked. When I temporarily told it to block all incoming connections, it had no effect on the ShieldsUp scan.
I'm using an airport base station, and just confirmed that the NAT routing box is checked (this equivalent to enabling its rudimentary hardware firewall, yes?)
Can anyone explain what's up? At the very least I'd like to do something about that open port (if it can be done without crippling something), and Ideally I'd like to disappear like in the good old days.
And if my concerns are completely misplaced, I'd appreciate it if someone could explain.
Thank you!

Shields up is reporting ports open on your router, not you Mac.
The Airport Base Station will only forward ports to your Mac if you have those set up in the router. Otherwise, nobody can see your Mac from outside the router.

Connectivity issue from only one computer

Let me start by saying i have 10 servers and about 15 workstations on this network. only one computer (my main computer) has this issue. all other computers work as they should.
This problem started to happen recently and randomly affecting RDP connections to 2 of 10 servers and now affects 5 of 10 servers. I am not sure i did anything to make the problem worse. Additionally I at first suspected it a DNS issue as connecting to the
ip address of effected computer as opposed to host name allows connection but as I said the issue is only on one computer. Looking at the logs below i am stumped.
ELECTRO4UBLADE
20499
Warning
Microsoft-Windows-TerminalServices-RemoteConnectionManager
Microsoft-Windows-TerminalServices-RemoteConnectionManager/Admin
3/18/2014 9:39:45 AM
Remote Desktop Services has taken too long to load the user configuration from server \\ADDS1.PDX.DAVISDARVISH.COM for user davis
RDPClient_SSL: An error was encountered when transitioning from TsSslStateDisconnected to TsSslStateDisconnected in response to 25 (error code 0x8000FFFF).

I'm experiencing the same issue, intermittently, when remotely using two of our eight SBS 2003 network computers via Remote Web Workplace. The two SBS computers are Windows 8.1 Pro 64 bit machines.
Intermittently, the RWW connection is lost and I'm returned to the RWW page with the message "VBScript Remote Desktop Disconnected...an internal error has occurred.
When the issue occurs, the Event logs on both SBS computers contain the Event ID 20499, Remote Desktop Services has
taken too long to load the user configuration from server XXXXX. The event is logged at the time the RWW connection is lost.
As the issue occurs with RDP sessions to Windows Server 2012 R2 (based on reports from others) and, in my case, SBS 2003,
perhaps the common element is Windows 8.1.

Stealth mode attempts

I seem to be getting a lot of messages in my Console log about:
11/15/10 10:17:22 PM Firewall[61] Stealth Mode connection attempt to UDP "numbers here" from "numbers here." I took out the numbers because I don't know if it is safe to post them.
It just seems a very high number of hits.
I connect to an AEBS to a cable modem.

http://discussions.apple.com/thread.jspa?messageID=12592096#12592096

Odd stealth connection attempts

Dear community,
Looking for advice on security.
I'm looking at my Console's appfirewall.log, and I'm getting relentless connection attempts like these on my laptop:
Dec 29 20:31:43 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to UDP 10.200.1.89:51413 from 186.105.225.249:41018
Dec 29 20:31:45 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to TCP 10.200.1.89:51413 from 24.93.125.238:60554
Dec 29 20:31:46 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to TCP 10.200.1.89:51413 from 186.105.225.249:48229
Dec 29 20:31:48 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to TCP 10.200.1.89:51413 from 24.93.125.238:60554
Dec 29 20:31:52 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to UDP 10.200.1.89:51413 from 66.41.205.203:52839
Dec 29 20:31:54 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to TCP 10.200.1.89:51413 from 24.93.125.238:60554
Dec 29 20:31:59 *********MacBook-Pro Firewall[85]: Stealth Mode connection attempt to TCP 10.200.1.89:51413 from 117.254.218.104:65083
...on and on for hours at a time.
What is going on here?
Thank you!

Hi,
I looked up the 24.93.125.238 number and this belongs to Road Runner who are an ISP.
The other numbers that start 24.xxx... also look like they are in the range owned by Road Runner.
66.41.205.203 is Comcast (another ISP)
186.105.225.249 covers an area for Latin America and Caribbean.
I have not checked the others.
Note.
The iChat and Messages app sends Pings when trying to connect in Video or Audio Only or Screen Sharing
If the Stealth option in the Mac Firewall is On it blocks these and you cannot connect these types of chats.
This may give you some clues as to why you are getting these attempts.
9:15 pm Sunday; December 29, 2013
 iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

Macbook Pro Crawling, noticing connections repeated from certain IPs

My Mac book Pro has been crawling lately, I have reinstalled and wiped the hard drive, and I am suffering the same problem, particularly on wireless networks, with an SSID. I feel I may have acquired the issue when our network was not initially secured.
Here is a sample of what is quite common in my log:
Jul 1 21:55:50 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:49955 from 74.125.91.100:80
Jul 1 21:55:55 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:49954 from 74.125.91.100:80
Jul 1 21:55:55 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:49955 from 74.125.91.100:80
Jul 1 21:57:35 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:35 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:35 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:35 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:36 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:36 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:37 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:37 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:39 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:40 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:44 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50067 from 74.125.91.100:80
Jul 1 21:57:44 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50068 from 74.125.91.100:80
Jul 1 21:57:54 ########-macbook-pro-15 Firewall[38]: Stealth Mode connection attempt to TCP ########.200.200:50074 from 64.233.161.147:80
Thanks for your help!

Since I've been trying to connect to my Mac from my windows work machine, I was surprised at how easy it was to access at least my home folder at ftp://[email protected] with just a simple username and password login. If someone thinks they have these items, they may be trying to connect, or perhaps it was a machine that used to be at your IP address.
Disabling all file-sharing under System Preferences>Sharing along with maintaining your stealth mode (not broadcasting that there is a machine at your IP address) ought to stop any possible attempts. If the continual logging is giving you a problem, try and turn off the logging attempts. That may be a source of your performance crawl as well.

Stealth mode logs in ipfw.log

Every so often I get logs like this in my /var/log/ipfw.log:
Jan 20 08:41:33 PowerBook ipfw: Stealth Mode connection attempt to TCP 10.0.1.x:53725 from xxx.xxx.xxx.xxx:80
These log entries do not show an ipfw rule number. So how can I tell which rule from ipfw is causing them to be logged? Are they being logged before matching any of the rules you see on the command sudo ipfw show?

Hi Rick,
Thanks also for your response.
Do you have a network printer? (make, model, please)
Any other network devices on this LAN (Xbox, printer,
PC :o
I don't have a network printer. The little network only consists of the router and the Mac for the time being.
Do you have uPNP enabled on your router?
What make/model of router? (there may be something
common to this mfr)
No, the uPNP is never enabled. My router is Belkin Wireless G Router (F5D7230-4), which is supposed quite Mac-friendly in the market...
You say you still get the logging, even when the DSL
modem is disconnected. Weird.
Yes, it is weird.
StealthMode has been known to cause more paranoia in
some users. This 137 port scanning might be coming
from a printer or other network device on the inside
of your little network...with stealth disabled,
things would just work the way they're supposed to --
quietly. Your mac is probably secure. Your router is
probably secure (especially if you changed the admin
password when you set it up. If you've been using the
default admin password, then shame on you <wink>
I have enabled Stealth mode in my Mac. Sorry to let you down (^^V) that I am not using the default password before the discovery of the port probing mentioned and have changed to another one after reset and firmware upgrade as advised by the other poster.
Am I off-base here, fellows?
Nope, you're appreciated for any idea trying to help.
TC
(P.S. I found that the "Helpful" is used up. Sorry that I can't give you one...)

Constant Freeze/Hang associated with UPD connection attempt

As suggested in another post, I have been monitoring the system logs with Console and the freezes/hangs and beach balls perfectly coincide with numerous (>15/per occurrence) of the following message:
9/7/09 6:21:33 PM Firewall54 Stealth Mode connection attempt to UDP 10.0.1.6:59119 from 10.0.1.1:53
Any thoughts?
Previous Background:
I am experiencing nearly constant freezing/beach balls. I can barely type this as it hangs up every 30 seconds or so. It happens in all applications and the finder. The issue started a few months back (with an update I suspect), and I have since installed SL with negative results.
I have repaired permissions and the disk from the SL install disk and checked the hardware with the original system disks: all with no problems reported. Activity Monitor shows 27 GB free space on the HD, more than half the memory available and minimal CPU activity. Also, reset the PRAM again with no improvement.
Not sure where to head from here, aside from installing SL from a clean disk...

A quick update to my issue: after more than 7 phone calls to Apple Tech Support, (who were more than helpful!) it took the macbook into the local repair shop. Turns out while the HDD did not fail any diagnostic test, replacing the HDD cured all issues.
Thanks again to those that offered assistance; and after all that I got an upgraded HDD 120 GB to 320 GB... could have been worse!

MDNSResponder connection attempt

Hello,
Since a few weeks I installed LittleSnitch as firewall.
I see in mDNSResponder connection attempts from my mac to an IPv6 address: fe80 :: 1610:9 fff: fed7: b0e5 on port 5353.
This is more strange that an attempt is made from macbook-pro-de-pierre-2.local while the name of my computer is macbook-pro-de-pierre.local.
I have no other computer at home so it is not normal for me there have macbook-pro-de-pierre-2.local.
I am in Belgium and we have not yet IPv6 address. We still atually to work with IPV4. I averaged 30 connection attempts per days from macbook-pro-de-pierre-2.local to this IPv6 address.
Do you find that normal? Know someone tell me where provide this IPv6 address? What would you advise me to do?
Thank you this is quite urgent.
Pierre

You can turn off IPV6 in your Network settings and reboot.
That process is Bonjour, Apple's zero configuration process and turning it off will cause more harm than good.
LittleSnitch default settings should have ignored this as a normal proceedure, so perhaps either LS hasn't been updated to LS 3 and/or there is a issue with your machine and it's flagging the unusual behavior.
It might be just a glitch in OS X itself, which if you go through these steps you'll see #8 Reinstall Just OS X can give you a new OS X in place, hopefully fixing the glitch. If not then move down into the other fixes as needed.
..Step by Step to fix your Mac

Stealth mode causing sleep trouble?

Hi,
I have a Rev A. PB 12", and I recently decided to beef up my security, so I checked on all the options under the "Advanced" button of the Firewall pane - Blocking UDP, Firewall logging, and Stealth Mode. It seemed to have worked for a few days, but then yesterday I discovered that the computer would not go to sleep on its own, but only if I forced it to. This really freaked me out because I just recently solved this exact issue with my computer, and it took my a very long time to figure it out, so I was naturally worried again. This time it turns out that if I turn off Stealth Mode, the computer is fine. If I keep it on, it keeps the computer awake. I am not sure why this occurs, and I would rather not have Stealth Mode off, but I want the computer to sleep on its own. Does anyone have any suggestions.? Thanks.

Erasing firewall prefes solved the problem

Firewall - stealth mode connection attempts from AEBS to computer

Similar Messages

Maybe you are looking for