Local host name keeps changing

My mac just started giving me a weird message when it wakes up after going to sleep. This computer's local hostname "Macintosh-8.local" is already in use on this network. The name has been changed to "xxxxxx-9.local". To change the local hostname, open System Preferences and click Sharing, then click "Edit" and type the name in the Local Hostname field. This is about the 8th time it's done this to me in the last couple weeks.

This also happened to me over the last few months when my iMac was connected to an Airport Extreme via ethernet, with wifi turned off.  There are no other units on the network with the same name; eventually my iMac name incremented to (name)8756.  After much research on this and other support sites (and many attempts following sugestions, including rebuild) I found that removing the ethernet connection and using wifi only fully resolved the issue. My problem is that other macs connecting to the shared disk and printer on the iMac are now slower and I cannot sleep the iMac.  When connected to the AE I used "wake up on ethernet request", which I believe caused the issue due to interactions between the iMac, router and the AE bonjour service.  I can connect the disk directly to the AE, but I repeatedly read that Apple do not support Time Machine on AE shared disks - even though they work better and more reliably than the shared iMac disk.
iMac now on 10.7.4; AE on 7.6.1.  I do not know precisly when the issue started.  The issue is totally repeatable - just connect to the AE via ethernet, turn off wifi.  I suspect a bug somewhere, any help would be appreciated as I like the previous speed and do like to sleep the iMac.

Similar Messages

  • Why does the local network and computer name keep changing?

    After upgrading to Yosemit the local network name and computername on my iMAC keep changes link:
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    Mycomputer-2
    Mycomputer-3
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    I have tried to change it back in sharing and network locations.
    Is this also the reason the my iPhone cannot find my iPhone often cannot find my iMac when I will sync it? Then I have to restart the iPhone and iTunes on the computer. This happens very very often.
    Maybe it also linked to these errors which the log is full of - many every minute:
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    I think the is some bug/clash between bonjour and other network protocols. That is only a guess.

    After resetting the computer name and local host name to the correct name without the number I also shotdown my iMac, my AppleTV, my iPhone, my iPad and then rebooted my Airport/Time capsule it seemed to work at least for several days. But yesterday I discovered that my Apple TV now also has changed name to Apple TV (2).
    I logged into iCloud.com to see my devices and here it was really wired. My Apple TV was called Apple TV (2) and my iMac also had (2) after the name. Then I checked it on the iMac but here it was correct! Why can it have one name on the iCloud and another on the computer.
    I restarted both the iMac, Apple TV and Airport Time capsule then everything was correct also on iCloud.com.
    But today the iMac was called the name (2) again on the iMac. And now the local host name also had -2 after the name. It has not always been both names that has changed. That is really wired. And today Wifi was not working on the iMac after wake from sleep. I changed the name back and rebooted again also the Airport Time capsule. Now it is working again.
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    The name is not the only problem. Often itunes will not find my iPhone and iPad. Then i need to close iTunes and restart the iPhone and iPad then it works for some time.
    And the iPhone and AppleTV will not always wake the iMac from sleep. I am wondering if the is linked to the changing of name.
    I have seen by googling that it can be related to a sleep proxy problem so it seems like that here is two devices on the net with the same name that is why name is changing, but to know this do not help me to solve the problem. I have also seen all the suggestion to turn almost every services off on the computer, but again I it is not a solution and I have the iMac and devises to use the functionality not to shot everything down. So I do not really understand people saying turn off itunes, turn off blueboth, and turn off this and that.
    Apple must soon come with a real solution. We are really many people have these problem since we upgraded to Yosemite and iOS 8.
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    02/11/14 19.25.06,908 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:5
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    02/11/14 19.30.54,871 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:6
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    02/11/14 19.30.54,871 iTunes[480]: tid:1a23b - Can't handle disconnect with invalid ecid
    02/11/14 19.32.06,137 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.

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    Message was edited by: EricWeiner
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