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You are here: MacNN Forums > Software - Troubleshooting and Discussion > macOS > mDNSResponder - Unwanted network traffic?

mDNSResponder - Unwanted network traffic?
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Fresh-Faced Recruit
Join Date: Feb 2002
Location: Bergen, Norway
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Jan 4, 2007, 10:49 AM
In my system.log I have this process that is constantly repeating itself every 5 seconds:

Jan 4 15:41:12 Tookas-iMac-G4 mDNSResponder: mDNSPlatformSendUDP sendto failed to send packet on InterfaceID 00000000 unicast/4 to skt 7 error -1 errno 13 (Permission denied) 3533272342

Apart from it using resources on the Mac, just the fact that it keeps trying over and over again, well it's a bit unnerving. Especially when I don't know what it is, and how to stop it.
Restart does not fix it, and quitting the process mDNSResponder itself is probably not a good thing, if at all allowed.

Any suggestions are greatly appreciated.
( Last edited by live4mac; Jan 4, 2007 at 11:39 AM. )
Junior Member
Join Date: Jan 2006
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Jan 4, 2007, 10:57 AM
I might be completely wrong, but I think it might have something to do with iTunes library sharing or bonjour.
Mac Elite
Join Date: Nov 2001
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Jan 4, 2007, 12:51 PM
mDNSResponder is Bonjour (formerly called Rendezvous). It generates very little traffic (well, it generates a fair bit of traffic at system or application startup and then backs off exponentially).

If you have contact sharing turned on in Address Book, or music sharing turned on in iTunes (or have "search for other peoples' music" you will get some additional Bonjour traffic.

But it's really nothing to worry about. The traffic it generates is very minimal. If you knew how chatty TCP/IP was in general you'd know it's maybe 1/10,000 the traffic that goes out. Actually prombably more like 1/10,000,000
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