Mdnsresponder Process

Hello,
I've noticed a process which is continually running in my Activity Monitor called mdnsresponder. The strange thing about this process is that the user which mdnsresponder is running under is "_ mdnsresponder" (with an underscore to the left of it). I always thought that the user should be root for this process (it runs under root on our PowerBook G4/667 running Mac OS X 10.4.11). I've never noticed this until today and unfortunately, I read something on the Internet (in trying to research this process) about someone who thought they had been hacked since the user which mdnsresponder was running under was not root.
The same thing is happening with the process WindowServer. The user it is running under is "_windowserver" (with an underscore to the left of it). Not root. All of the other processes running in my Activity Monitor either belong to the user root or, to my user name (with the exception of the process distnoted which belongs to the user "daemon").
Does this make sense under Mac OS X Leopard 10.5.6?
What is mdnsresponder for? It is continually running on my iMac 3.06 GHz Intel Core 2 Duo now. The only thing I have recently changed on my iMac is that we just started sharing a USB printer on our network (which of course, is connected to my iMac) - could this be why mdnsresponder is always running? There are also two smbd processes running on my iMac which I don't quite understand.
These processes are confusing and I get worried sometimes that there is a virus or a trojan on my iMac. I had to open one port (5190) in our router/firewall in order to get iChat to work properly and I'm a bit worried about this since I also had to turn the ping feature of the router back on in order for iChat to work as well.
Thanks for any info you can provide.
Gerard
Message was edited by: Gerard James

Thanks for your reply and also for the link. I looked at all the info but I still don't know why the smbd process is running on my iMac. I'm not using Bonjour at all (unless printer sharing uses it somehow) and we have nothing to do with Windows computers on our network. All services are OFF except for printer sharing in my Sharing preferences.
Interestingly, after my post - I re-booted my iMac and noticed that mdsresponder wasn't active (I use Little Snitch and can tell when it's actually "in use" by seeing the processes up in the top right corner of my screen that Little Snitch displays - what a superb utility Little Snitch is, by the way). As soon as I logged in to this forum to reply to your message, voila - I see mdsresponder running.
But I still don't understand why the "user" displayed in the Activity Monitor is "_ mdnsresponder" and not "root". I guess maybe this is just a change made in Mac OS X Leopard 10.5.6? mdnsresponder runs under "root" in Mac OS X 10.4.11 on our PowerBook G4/667.
Overall - I guess this is nothing to be overly concerned about. I'm just curious to know if other Mac OS X 10.5.6 users out there notice that mdnsresponder runs under the user "_ mdnsresponder" rather than "root"?
Thanks again for your help.
Gerard

Similar Messages

Syslogd using 100% CPU logging mDNSResponder error

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1/28/12 2:06:35.025 PM mDNSResponder: mDNS_Deregister_internal: 21 6.8.0.E.D.5.E.F.F.F.A.C.5.5.A.5.4.3.2.1.1.F.B.2.D.6.8.1.2.0.0.2.ip6.arpa. PTR Apple-TV-2116.local. already marked kDNSRecordTypeDeregistering
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I disabled sleep on the AppleTV because I thought it was getting a new address/ip everytime it woke but that hasn't stopped the issue. I googled the error and only found one other forum post regarding the issue and there was no solution. I'm tempted to take the AppleTV off the network for a week to see if that resolves the issue but it does get used fairly often and none of the other macs on the network are having problems so I think it's something specific to my mac mini.
Thanks!

I am also seeing this problem, as of installing the brand new Apple TV. My mac mini running 10.7 gets rate limited syslog entries, with each of mDNSresponder and syslogd taking a core, hummm....
2012.04.14 11:50:33.024 AM mDNSResponder: mDNS_Deregister_internal: <ipv6addr>.ip6.arpa. PTR Apple-TV-578.local. already marked kDNSRecordTypeDeregistering
Killing off mDNSResponder stops it, for a while. I don't know what causes it to start up again. I'd love a solution, as it looks like a bug with mDNSResponder itself, rather than a configuration issue with my mac, apple tv, or network.
Both are very plain vanilla from a config and software standpoint (no jail breaking, haxoring, etc) and updated to current versions of soft/firmware.
I don't want to disable Bonjour, I use it. Obviously the problem is related to the Apple TV device, but according to the message above, there is some sort of internal argument about whether or not an IP v6 addr is in the correct state/workflow. Whatevs. I could probably disable ipv6 and forget it, but that's not really a fix, more of a field dressing. At this point, IPv6 needs to work, bonjour needs to work, even with a misbehaving device.
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A process called "NETserver" continually my CPU

My Activity Monitor shows me that a process called NETserver uses just short of 70% of the CPU, and does so continuously (i.e. at least over the past hour). Another process, mDNSResponder, gobbles up another 40%, and syslogd another 40%.
Any ideas what these processes do, and whether this is OK??? The iMac gets quite hot, especially towards the upper part.
Thanks for any pointers.
Cheers,
Veit

have no idea what NETserver is, but here is an article that says it is
a brother twain driver. I have a brother twain driver setup, but I don't
have any process running called NETserver.
http://boardreader.com/thread/NETservermDNSResponder_syslogd_using_up5p2wzX1avdi.html
Mac OS X v10.6 uses the mDNSResponder process for unicast DNS (Domain Name System)
functions, as well as Bonjour functions.
The syslogd server receives and processes log messages. Several modules receive input messages
through various channels, including UNIX domain sockets associated with the syslog(3), asl(3), and
kernel printf APIs, and optionally on a UDP socket from network clients.

MDNSResponder[25]: handleLNTGetExternalAddressResponse: Router returned...

Getting this error every 30 seconds or so - my log is getting huge....
Oct 28 21:51:00 PowerMacG4 mDNSResponder[25]: handleLNTGetExternalAddressResponse: Router returned bad address
Oct 28 21:51:00 PowerMacG4 mDNSResponder[25]: Error getting external address 3
Any ideas?
If I go to Acitvity Monitor and kill the mDNSResponder process teh error stops - until I reboot.

I captured this from the mdns process before killing it... does this help anyone?
I have also - disabled time synchronization with time.apple.com and enabled DNS relay on my router to see if any of those had anything to do with it. So far... not!
Sampling process 25 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling mDNSResponder (pid 25) every 1 millisecond
Call graph:
2563 Thread_2503
2563 start
2563 _start
2563 main
2563 CFRunLoopRun
2563 CFRunLoopRunSpecific
2563 mach_msg
2563 machmsgtrap
2563 machmsgtrap
2563 Thread_2603
2561 KQueueLoop
2561 kevent
2561 kevent
2 pthreadstart
2 KQueueLoop
2 tcpConnectionCallback
2 natTraversalHandleAddressReply
2 LogMsg
2 WriteLogMsg
2 syslog$LDBL128
2 vsyslog$LDBL128
2 notifygetstate
2 notify_server_getstate
2 mach_msg
2 machmsgtrap
2 machmsgtrap
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
machmsgtrap 2565
kevent 2561
Sample analysis of process 25 written to file /dev/stdout
If I kill the process and it restartsautomatically This is the info from the process sample:
Sampling process 225 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling mDNSResponder (pid 225) every 1 millisecond
Call graph:
2624 Thread_2503
2624 start
2624 _start
2624 main
2624 CFRunLoopRun
2624 CFRunLoopRunSpecific
2624 mach_msg
2624 machmsgtrap
2624 machmsgtrap
2624 Thread_2603
2624 KQueueLoop
2624 kevent
2624 kevent
Total number in stack (recursive counted multiple, when >=5):
Sort by top of stack, same collapsed (when >= 5):
kevent 2624
machmsgtrap 2624
Sample analysis of process 225 written to file /dev/stdout
And no more error messages.
Message was edited by: MacRN
Message was edited by: MacRN

I can't connect to Internet anymore (WIFI or Ethernet). This was working perfectly before. I don't get a proper IP address from my ADSL box and it seems there is a DNS error when accessing the Internet.

I have an issue with my MacBook pro (MAC OS X 10.8.3) when trying to access Internet. I am behind an ADSL box (Orange). I have a PC on the same LAN which accesses Internet perfectly via the same Box.
On the MAC, I have tried WIFI and Ethernet. And have same issue on both. I have checked the IP address (the ADSL box is a DHCP server) but the MAC doesn't get a proper IP and network mask I tried a manual IP address setup and it doesn't get better. I have setup the DNS servers for my Internet provider, but I get DNS error. I have tried 2 Internet browsers (Chrome and Safari), both have the same issue.
I tried to put my MAC on a different ADSL box (I have 2 acccesses with 2 providers at home) and get the same issue.
I also noticed a havy CPU load on the mDNSResponder process (at least 30%). I have restarted it, but no improvement.
Last, I have repared the permissions.
From those trials, it seems that the problem is on the Mac side. But I am completelly without any new idea, so I need help
Thanks

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

How I fixed lost airtunes and lost shared library

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What helped me this time (and this was the fastest solution so far):
I KILLED the mDNSResponder process in the Activity viewer. You will need to enter your Admin password as this process is owned by root.
But on my machine it immediately brought back my Airtunes menu with my speakers in the living room and on other computers I could immediately see again the shared library.

and I can confirm this REALLY works!!!
I just now tested: AirTunes was grayed out (remote speakers could not be found)
I killed mDNSResponder
restarted iTunes
voilà it's working
for UNIX geaks:
use:
grep -aux | mDNS
and then
sudo kill -9 (id of the task, second column)
Michael

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3. Open control panel / add remove programs. Find the bonjour app and click on it.
4. Note the corrupted version of bonjour 2.0.0.34 by clicking on the support link.
5. Uninstall bonjour
6. Restart Windows.
7. Install the AirPort Utility. This will install a good working version of mdnsresponder. Restart windows again.
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ds store: You mentioned outgoing packets when you start iPhoto. I just watched it, and it makes a TCP connection to configuration.apple.com. That's probably the automatic check for a new iPhoto version, which I had enabled.
Yea it does that and something else, if you have BigTop installed from the Developers Tools and set to watch the outgoing packet sizes, everytime you launch iPhoto there's all these outgoing packets...
I found out what it was, it's calling the mDNSResponder process which
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Note: this runs under the pseudo-user "nobody" (presumably for security reasons).
(so thats who nobody is. )
http://www.westwind.com/reference/OS-X/background-processes.html
Oh great, just broadcasts my computer name (which often has your real name when you set up Mac OS X) out in the clear whenever I take a look at iPhoto, wonderful.
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I've deleted all my Little Snitch rules, including the default ones, and now carefully only allow certain processes or applications access and then for only as long as I'm using them.
I'm experimenting with LS to see if it gives 100% complete network blockage, I had it run all night last night and found one packet leaves the machine every 4 hours or so, apparantly it's the lookupd process, which will be denied tonight.
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There are some other juicy things I'm finding out. Address book, the Dock, iDVD making outgoing network connections. you can read this thread
http://discussions.apple.com/message.jspa?messageID=2265203#2265203

New router = constant activity outgoing!

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*A second issue*
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This is part of OSX: I quote:
Mac OS X v10.6 uses the mDNSResponder process for unicast DNS (Domain Name System) functions, as well as Bonjour functions. Disabling the mDNSResponder process will also disable unicast DNS resolution, and without unicast DNS resolution, Mac OS X v10.6 cannot resolve hostnames such as www.apple.com.
The same article gives a method for disabling it:
http://support.apple.com/kb/HT3789
However it probably isn't actually transmitting very much information - many routers 'announce' their presence but it's only a few bytes, insignificant compared with normal traffic.
Open Activity Monitor in Application/Utilities and scroll down the list of process names to find mdnsresponder: you will see how much of your CPU it's using. Mine is currently showing 0%.

Itunes is running but will not open after most recent 9.1 update w/Bonjour

I recently loaded the most recent update for Itunes 9.1 version on 3/31. Since then, I have not been able to open my Itunes. I think it might be related to Bonjour because I see that it was added during my most recent update and I have never had it on my computer before. Now, i cannot get back into Itunes. I installed the update but when I double click on the itunes icon to open the file - I get nothing. The screen never shows up. Yet when I go to the task bar it says itunes is running in the background but there is no evidence of this. Help - I have been installing and reinstalling for the past couple of days with no luck.

I have three computers that are practicably clones of each other and the new itunes update failed on two of them but one worrked fine. Here is fix that worked for me. This fix was suggested by another member but I cannot recall or find his post. My system is WinXP sp3 with all the latest patches.
1. Download AirPort Utility 5.5.1 for Windows http://support.apple.com/downloads/
2. Open task Manager and stop the mdnsresponder process. The corrupted mdnsresponder will be using 50% of your cpu.
3. Open control panel / add remove programs. Find the bonjour app and click on it.
4. Note the corrupted version of bonjour 2.0.0.34 by clicking on the support link.
5. Uninstall bonjour
6. Restart Windows.
7. Install the AirPort Utility. This will install a good working version of mdnsresponder. Restart windows again.
8. Upon restart you will see a new the airport icon in your task tray. You can also find mdnsresponder.exe running under process in task manger with little or no cpu usage. Your bonjour app under add remove panel will now be version 1.0.106

Photos dont set right after the up date on screen

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I did run disc utility off the install disc and ran disk repair on both the volume and permissions before running the verbose mode. Do you think it would make sense that I still get that corrupt mDNSResponder.plist file? Just curious.
Unfortunately, the Disk Repair feature of the Disk Utility does not necessary "fix" corrupted .plist files ... so, yes, I would think that you could still have a corrupted mDNSResponder.plist file even after running it.
Do you have any idea what that mDNSResponder.plist file may be and if it could be related to setting file sharing or turning off my firewall, both of which I did right before this problem?
OS X uses the mDNSResponder process for both unicast DNS and Bonjour functions. Unicast DNS resolution is used to resolve hostnames like www.google.com. It would be related to file sharing as it would be necessary for local host name resolution.
To boot off a clone, power-down your Mac. Plug in the clone drive, and then, power-up the Mac again. Your Mac should find and boot off the bootable clone drive.

OSX 10.7.4 freezes on login screen

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29/06/12 21:53:05,000          kernel          NVDA(OpenGL): Channel exception! exception type = 0x6 = Fifo: Parse Error
29/06/12 21:53:05,000          kernel          IOVendorGLContext::ReportGPURestart
29/06/12 21:53:05,000          kernel          NVDA(OpenGL): Channel exception! exception type = 0x6 = Fifo: Parse Error
29/06/12 21:53:05,896          sandboxd          ([226]) DumpGPURestart(226) deny network-outbound /private/var/run/mDNSResponder
29/06/12 21:53:21,624          UserEventAgent          servermgr_certs[202] -[CertsRequestHandler(HelperAdditions) identitiesFromKeychain:]:          SecItemCopyMatching (err = -25300)
29/06/12 21:53:21,630          com.apple.UserEventAgent-System          SecItemCopyMatching: Impossibile trovare nel portachiavi l’elemento specificato.
29/06/12 21:53:21,633          UserEventAgent          servermgr_certs[202] -[CertsRequestHandler(HelperAdditions) identitiesFromKeychain:]:          SecItemCopyMatching (err = -25300)
29/06/12 21:53:21,633          com.apple.UserEventAgent-System          SecItemCopyMatching: Impossibile trovare nel portachiavi l’elemento specificato.
29/06/12 21:53:21,634          UserEventAgent          CertsKeychainMonitor: ready to process keychain & timer events
29/06/12 21:53:25,000          kernel          NVDA(OpenGL): Channel timeout!
29/06/12 21:53:37,000          kernel          AppleIntelFramebuffer VBL interrupts lost DEISR 00000010 DEIMR 7cdfff7f DEIER 83200080
Can it be a software issue related with the NVidia drivers?

Follows the details of the DumpGPURestart log entry:
DumpGPURestart(226) deny network-outbound /private/var/run/mDNSResponder
Process:         DumpGPURestart [226]
Path:            /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/DumpGPURestart
Load Address:    0x104d15000
Identifier:      DumpGPURestart
Version:         ??? (???)
Code Type:       X86-64 (Native)
Parent Process: launchd [1]
Date/Time:       2012-06-29 21:53:05.465 +0200
OS Version:      Mac OS X 10.7.4 (11E53)
Report Version: 7
Backtrace:
0   libsystem_kernel.dylib                  0x00007fff92feb57e __connect_nocancel + 10
1   libsystem_dnssd.dylib                   0x00007fff8d877448 ConnectToServer + 829
2   libsystem_dnssd.dylib                   0x00007fff8d878e9d DNSServiceCreateConnection + 50
3   libsystem_info.dylib                    0x00007fff93ac307d _mdns_search + 1689
4   libsystem_info.dylib                    0x00007fff93ac38b7 mdns_addrinfo + 615
5   libsystem_info.dylib                    0x00007fff93ac4151 search_addrinfo + 152
6   libsystem_info.dylib                    0x00007fff93ac7a1c si_addrinfo + 1614
7   libsystem_info.dylib                    0x00007fff93ac922a si_list_call + 294
8   libsystem_info.dylib                    0x00007fff93ac9050 __si_async_call_block_invoke_1 + 96
9   libdispatch.dylib                       0x00007fff88afaa86 _dispatch_call_block_and_release + 18
10 libdispatch.dylib                       0x00007fff88afb965 _dispatch_worker_thread2 + 255
11 libsystem_c.dylib                       0x00007fff894a33da _pthread_wqthread + 316
12 libsystem_c.dylib                       0x00007fff894a4b85 start_wqthread + 13
Binary Images:
    0x7fff88af9000 -     0x7fff88b07fff libdispatch.dylib (187.9.0 - compatibility 1.0.0) <1D5BE322-A9B9-3BCE-8FAC-076FB07CF54A> /usr/lib/system/libdispatch.dylib
    0x7fff89453000 -     0x7fff89530fef libsystem_c.dylib (763.13.0 - compatibility 1.0.0) <41B43515-2806-3FBC-ACF1-A16F35B7E290> /usr/lib/system/libsystem_c.dylib
    0x7fff8d875000 -     0x7fff8d87dfff libsystem_dnssd.dylib (??? - ???) <D9BB1F87-A42B-3CBC-9DC2-FC07FCEF0016> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff92fd5000 -     0x7fff92ff5fff libsystem_kernel.dylib (1699.26.8 - compatibility 1.0.0) <1DDC0B0F-DB2A-34D6-895D-E5B2B5618946> /usr/lib/system/libsystem_kernel.dylib
    0x7fff93aad000 -     0x7fff93ae8fff libsystem_info.dylib (??? - ???) <35F90252-2AE1-32C5-8D34-782C614D9639> /usr/lib/system/libsystem_info.dylib

Bonjour Login vs IP Login (command-k)

Our file server is 10.4.3 w/ 2GB RAM. Our clients are all G5s running 10.4.3.
I'm wondering if something is up w/ out network config. We are a small subnet on a large corp network, and lately (since 10.4.3) I have noticed a new issue, though it has been easy to work around.
Clients on the main network crash when they attemp to connect via Binjour browsing (Via the Network area of the Finder windows) but connect fine via Command-K and the IP address.
We have a second private network, (the metadata network for our Xsan) that only 2 machines use, and on this network Bojour works fine, in fact our transfer speeds are about 30% higher when we connect via Bonjour vs IP...
I'd love to get that 30% boost for my other clients, so I'm wondering if anybody has any suggestions on network configs for getting Bonjour to behave. I think it has soemthing to do w/ DNS, as previously we have seen some DNS/Bonjour related freak outs involving the mDNSresponder process when the servers have lost access tot he main corp DNS...
any ideas???

Bonjour use IP too. Depending on your setup, subnets and such, you either have a DHCP server or use static IPs for the Xsan. I guess it might work having self assigned IP's (like 169.xxx.xxx.xxx) but I would use "real" IP's.
Bonjour use multicasts to find/present nodes/services on your LANs but if you use something like fileserver.local to mount an AFP server volume it still use TCP port 548 for that traffic.
I guess you could have some routing problems, re-using the same network numbers on more than one subnet, overlapping netmasks or some other network related problem.
That 30% speed increase must be from mounting the Xsan volume directly via FibreChannel on those computers since the metadata network only transports metadata (filelocking and such) not the actual data.
And Apple doesn't support IP over FibreChannel (yet?) so a Xsan volume is either mounted directly as a shared disc (mounting the same disc on 2 or more computers as a local volume but using the "Xsan" filesystem) or as a re-shared volume via AFP/SMB/NFS.

Installed Itunes 9.1 - running , but will not open...

I installed the iTunes 9.1 on my Win VISTA laptop. After the install, can no longer open Itunes. I click on the Itunes icon and nothing happens, even thought it's running. Might this have to do with Bonjour? I disabled it through the Control Panel/Administration/Services - but it still won't run.

I have three computers that are practicably clones of each other and the new itunes update failed on two of them but one worrked fine. Here is fix that worked for me. This fix was suggested by another member but I cannot recall or find his post. My system is WinXP sp3 with all the latest patches.
1. Download AirPort Utility 5.5.1 for Windows http://support.apple.com/downloads/
2. Open task Manager and stop the mdnsresponder process. The corrupted mdnsresponder will be using 50% of your cpu.
3. Open control panel / add remove programs. Find the bonjour app and click on it.
4. Note the corrupted version of bonjour 2.0.0.34 by clicking on the support link.
5. Uninstall bonjour
6. Restart Windows.
7. Install the AirPort Utility. This will install a good working version of mdnsresponder. Restart windows again.
8. Upon restart you will see a new the airport icon in your task tray. You can also find mdnsresponder.exe running under process in task manger with little or no cpu usage. Your bonjour app under add remove panel will now be version 1.0.106

HT3281 on ipad ,itunes movies download but will not open

can't get downloaded itune movies to open.any tips?

I have three computers that are practicably clones of each other and the new itunes update failed on two of them but one worrked fine. Here is fix that worked for me. This fix was suggested by another member but I cannot recall or find his post. My system is WinXP sp3 with all the latest patches.
1. Download AirPort Utility 5.5.1 for Windows http://support.apple.com/downloads/
2. Open task Manager and stop the mdnsresponder process. The corrupted mdnsresponder will be using 50% of your cpu.
3. Open control panel / add remove programs. Find the bonjour app and click on it.
4. Note the corrupted version of bonjour 2.0.0.34 by clicking on the support link.
5. Uninstall bonjour
6. Restart Windows.
7. Install the AirPort Utility. This will install a good working version of mdnsresponder. Restart windows again.
8. Upon restart you will see a new the airport icon in your task tray. You can also find mdnsresponder.exe running under process in task manger with little or no cpu usage. Your bonjour app under add remove panel will now be version 1.0.106

Mdnsresponder Process

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