Youâ€™ve noticed the mDNSResponder.exe process running the same way you saw rundll32.exe and svchost.exe in Task Manager, you donâ€™t remember installing it, and it doesnâ€™t show up in the Add/Remove programs in Control Panel. So what is it, and how do we get rid of it?
What is mDNSResponder.exe or Bonjour?
The mDNSResponder.exe process belongs to the Bonjour for Windows service, which is Appleâ€™s â€œZero Configuration Networkingâ€ application, typically installed automatically by iTunes. If youâ€™ve ever wondered how one iTunes install can talk to another on the same local network, Bonjour is what actually does this behind the scenes.
Donâ€™t use iTunes? You arenâ€™t alone, and thatâ€™s not the only way that Bonjour gets installed on your computer. Itâ€™s also bundled in a whole bunch of other software, like Pidgin, Skype, and Safari, and used to connect clients together on the same network.
Itâ€™s implemented as a Windows Service, which you can see if you head into the services panel (or just type services.msc into the start menu search box). You can stop it from here anytime.
The whole problem we have is that it generally doesnâ€™t show up in Add / Remove Programs, so you canâ€™t get rid of it through any normal methods. Thankfully you can still remove mDNSResponder.exe if you really want to, and it will simply limit some of the functionality in the apps that might rely on it.
Important: Donâ€™t remove Bonjour if you use iTunes to share libraries, or any other feature from an application that relies on it.
How Do I Remove It?
First, it should be noted that you can disable Bonjour without necessarily removing itâ€”just head into the Services panel, double-click on the service, and change the Startup type to Disabled.
This is probably your best bet if you donâ€™t really want to break anythingâ€”if you have problems you can always re-enable it.
Alright, How Do I Really Remove It?
Letâ€™s get down to business. If youâ€™re absolutely sure you want to remove it, itâ€™s really pretty simple. Open up a command prompt in administrator mode (right-click and choose Run as Administrator), and then change into the installation directory, usually the following:
If you are using Vista or Windows 7 x64 edition, youâ€™ll need to head into the Program Files (x86) folder instead. Now that you are there, type in the following command to see the options:
Ah, so now we know what to do to remove it! Simply type in the following:
Youâ€™ll get a message saying that the service has been removed. (Note again that you need an Administrator mode command prompt)
Youâ€™ll want to also disable the DLL file in the directory by renaming it to something else:
ren mdnsNSP.dll mdnsNSP.blah
You should be able to actually remove that entire directory if you really want to.
Wait, How Do I Enable It Again?
Oh, so your favorite application broke? No matter, you can easily re-install the Bonjour service with the following command:
But I Deleted It!
So you did it.See, you really shouldnâ€™t delete things until you are sure they arenâ€™t useful anymore. Thatâ€™s why renaming is a good thing. Thankfully you can simply head over to Appleâ€™s page and install Bonjour again.