Device discovery does not work with Yosemite

Hi, this is Detective Vdawg, and I came across a similar issue when I updated to Yosemite on my MacBook Pro (Retina, 15-inch, Early 2013). Here is what I did. First, turn off all bluetooth devices turn off your printer and your computer. Wait about 15-30 seconds, then press and hold these four buttons for five seconds: shift, control, option, and the power button. What that does is refresh the hardware components; your settings will remain the same as they were before. After the computer reboots, then everything should be working the way it normally does including your device discovery. If that helps, please let me know; also let me know if it does not resolve your issue for whatever reason. I will be searching for different ways to resolve this problem. If you come across any more issues along the way, I would be happy to help you if I can.

You may have to contact AppleCare and ask for technical support.

Unblocking discoveryd will make bonjour services work. It is probably necessary.

On the other hand: I just unblocked discoveryd and it did not fix my (very similar) problem.

So I found if I 1) unblock discoveryd in the firewall preferences and 2) reboot (which should not be necessary) the problem gets fixed.

You are right to be puzzled. It should not require an incoming connection -- it did not used to require it. It should only require an outgoing connection for the request/response. Also, it didn't used to be the case that you needed to reboot to make the firewall rules stick. Something is buggy here. You are also right to be worried about the security implications of permitting incoming connections. Hopefully Apple will fix the bug soon -- if you have a developer account, file a Radar. (I have one and already did.)

Same problem here. I can connect to LAN printers via Ethernet, but as soon as I connect to the network via the Airport Extreme all rpinters are not visible any more.

I've been having similar issues since Yosemite on an iMac. It had been lagging extremely to the point I couldn't work. Tried many suggestions, and the I remembered I stopped using a bluetooth external speaker that had suddenly started skipping signal; it striked me that it could be an issue with the iMas's bluetooth and not with the speaker; I also had other devices hooked (mouse, keyboard, etc.). So I erased all devices, replaced the mouse and keyboard with wired ones, and turned off bluetooth. Voiala! Stopped lagging and now everything is back to smooth, but, no bluetooth devices! Any suggestions?

How exactly did you unblock discoveryd? I am having the same issue and on my machines the Automatically allow signed software... is checked.

Thanks, unblocking Discoveryd in the firewall prefs worked for me!

Took me a while to add the discoveryd exception to the firewall SO here are the exact steps to add discoveryd to your firewall on a mac pro 10.10.2 yosemite:

• Finder > Go > Go to Folder > /usr/libexec/ > move libexec to your favorites
• Apple > System Preferences > Security & Privacy > Firewall > Unlock > Admin user/password
• Firewall Options > + > navigate to libexec by clicking on your libexec shortcut > select discoverd > add
• Make sure discoverd is set for allow incoming connections > OK
• Lock firewall > close system preferences
• remove libexec short cut from finder