Hi
I have discovered this issue too. I also figured out what is doing this.
Have a look at this: https://f20.be/blog/mdns
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I've applied a GPO to disable mDNS. I've double-checked the GPO on the local client. The GPO is correct and applied to Computer settings.
Turn off smart multi-homed name resolution - enabled
Turn off multicast name resolution - enabled
I've also checked the TCP/IP WINS settings disable NetBT so no NetBIOS over TCP/IP. I've disabled this on both network adapters Wired and Wireless. I've removed IPv6 as it's not needed.
When I use Wireshark and ping bob.local I can see MDNS traffic. Why is this protocol still working !!!!
I've used this URL as a reference and have disabled and checked all settings according to this article, even checking the registry!!
http://woshub.com/how-to-disable-netbios-over-tcpip-and-llmnr-using-gpo/
I need to fully disable this protocol per our InfoSec Dept.
Hi
I have discovered this issue too. I also figured out what is doing this.
Have a look at this: https://f20.be/blog/mdns
We ran into the same issue.
After some research, we found that GPO seemingly created an entry here called "EnableMulticast" (red circle, which we know does nothing), while adding the same entry, just written differently, works. (black circle)
This makes me wonder if Microsoft somehow added a buggy GPO feature without noticing it for years?
Hello BrianCerveny,
You will need to apply these settings to ALL client computers where traffic needs to be blocked.
Also you can block que source of the traffic which would be the mDNSResponder.exe process or in Services> Disable "Bonjour Service"
--If the reply is helpful, please Upvote and Accept as answer--
GPO is applied to all computers.
No Apple software and or Bonjour was never installed in our environment.
mDNSResponder.exe is not running or present.
Any other options?