error message that my local host name is in use and the system generates a new one every time I wake my mac the error mssg reads This computer’s local hostname “D-360.local” is already in use on this network. The name has been changed to “D-444.local”.
Do other devices do this do when connect to this network?
Has it always done this?
There are several possible causes for this behavior.
1. Two (or more) computers on the local network have the same Bonjour name, such as "X's-MacBook-Pro.local". Resolve the name conflict by renaming one or more of them in the Sharing preference pane.
2. You have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. If applicable, disconnect the Ethernet cable or turn off Wi-Fi.
3. A Mac wakes from sleep due to network traffic. This is a bug in OS X that may only affect some models.
4. A device that gets its network address from the router wakes from sleep, and the address it was using before has been assigned to another device.
5. A third-party wireless router has incompatible settings or firmware. In that case, refer to the manufacturer or ISP for support. Restarting the router may help, temporarily.
6. See also this support article.
I just upgraded to 10.10.4 mac book pro and only get this message when NOT connected to WIFI. Once I turn WIFI on, the constant annoying "is already in use on this network" popup message goes away. Is there some crazy local OS routing table doing a loopback that cannot handle not being connected to an external network?
I have the same problem. It only happens when not connected to WIFI or any network. Very annoying.
This is happening to me due to ethernet and wifi connected at the same time, when I dock my Macbook pro (WiFi) to my Thunderbolt Display (Ethernet). This seems like a bug to me. There should be no malfunctions caused from having WiFi and Ethernet connected at the same time.
In addition to the previously listed possible causes of this problem, there was a period when Yosemite i.e. 10.10 had problems down to the then new software called discoveryd which was responsible for performing Bonjour look ups. Apple eventually reverted back to the previous more reliable mdnsresponder software in Yosemite 10.10.4 which 'fixed' that particular problem.
You don't list what version of OS X you are running but if an older version of Yosemite i.e. 10.10 to 10.10.3 then you should upgrade to 10.10.5.
This would not apply to El Capitan.
every time i wake my mac i get This computer’s local hostname “D-360.local” is already in use on this network. The name has been changed to “D-444.local”.
