HT5167 Error after 10.7.4 upgrade..."computer's local hostname ........is already in use on this network. The name has been changed to...... What to do now to get it back to status before 10.7.4 upgrade?

Error after 10.7.4 Lion Upgrade to iMac
Computer's local host name .......is already in use on this network. the name has been changed to........
and it keeps adding up the number each time I wake the iMac.
What to do to get it back before upgrade error?

Ok worth repeating, hope this works. Finally spoke to AppleCare Support and walked me thru following...restart computer holding down "command" and "option" keys at the same time with letters "P" and "R" when computer turns on. This is what he called a PR restart, clears out discrepancies in memory (if that is what the error message actually is). Then went to Systems Preferences/Network/Sharing and deleted the number that kept increasing every time MAC would wake up.
Even tho this was just done, I am hopeful that error pop-up won't happen again. Fingers crossed!

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This computer's local hostname is already in use on this network the name has been changed to

I've been getting this error after waking my computer from sleep. I think it has to do with my airport extreme. Does anyone have a fix?

Sometimes this message means that you have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. Disconnect the Ethernet cable or turn off Wi-Fi.
Sometimes it happens because 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.
Rename the computer in the Sharing preference pane.

This computer's local hostname is already in use on this network

has anyone else experienced this issue?
The iMac will display the following error message on the screen every day or so (with the host number incresing by 1 digit each time):
This computer's local hostname "MacName.local" is already in use on this network.The name has been changed to "MacName-1.local". This continues even after I've reset the name in the System Preferences panel/sharing settings, for example ("MacName-2.local, MacName-3.local, MacName-4.local" etc).
Please advise
Currently running an Apple iMac
OS 10.6.8
*please see attached screenshot for a reference

(1) Check names of all other devices on the network, including the router, any airport express, iphone, ipad, printers etc. Make sure these all have unique names.
(2) Do you have both wired ethernet as well as wireless active on any of these devices, including the Mac computer? This has been linked to such renaming behavior in the past, apparently the two methods of accessing the internet, if both are active at the same time, may switch off and on and conflict with one another (shouldn't happen, but apparently does sometimes). Solution is to switch one of them off.
(3) The following may be helpful:
In System Preferences > Network > Airport > Advanced > TCP/IP
Set "Configure iPv6" from "Automatically" to "Off".
If you do this, check to make sure that your email and other tools are still working properly. If something goes amiss, change the iPv6 back to what it was.
(4) Go to your router and reset power to it.
(5) Go to your router and check its LAN client table. Make sure that all entries should be there. Investigate any "extra" devices on the network. For instance, if it shows 4 devices, but you know you have only a computer and a printer, investigate what the other two are. Delete them from the list if they really seem to be "ghosts."

I get this message:This computer's local hostname "x-8.local" is already in use on this network. The name has been changed to "x-9.local" I have turned off sharing and it continues to upgrade name. What is the fix?

I get this message: This computer’s local hostname “x-8.local” is already in use on this network. The name has been changed to “x-9.local” I have turned off sharing and it continues to upgrade name. What is the fix?

Hi, this is a common problem, mostly just irksome though.
It can have many cause, like using more than one Interface for connections, Router temporarily losing x.local & seeing a new connection with x.local already used, insists it must be x-1.local, x-2.local, etc..
What all Sharing do you have enabled?
Some possible fixes...
http://forums.macrumors.com/showthread.php?t=542899
https://discussions.apple.com/thread/3941367

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".

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”.

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.

This computer's local hostname is already in use. How can I fix this?

Almost every day the following message appears in a pop up box.
This computer's local hostname "my-iMac-6.local" is already in use on this network. The name has been changed to "my-iMac-7.local"
The numbers do not correspond to those in the name in the Security preferences.
I preformed the "fix" described in the discussion.apple.com/messages---/messageID=9113111.
Set "iPv6" from "Automatically" to "Off" in both Airport and Ethernet.
That is apparently not the answer either.
There is only one computer in my house with the name shown in the message.
My wife's iMac has her name in it. Mine has my name in it.
How can I fix this?
Thanks for any help you can provide.
Rob Morrison

This seems to be a DHCP issue when the lease is renewed
When the computer reconnects (renews the lease) it believes its own computer name "already has been taken" so because the router has retained it on the local network so your computer inserts the after its computer name a
"-2" then a "-3" then "-4" etc. (the mac needs to do this and does so by default to ensure and create its own unique name on the local network)
-> this appears to be a delay / hangover on the router (AE or TC) when using DHCP
have seen a fix which only requires you set your computer with a fixed IP address
(can be EITHER reserved on the router OR set on the computer itself in network settings)
Router (AE or TC) Airport Utility 5.6 / Internet tab / DHCP button / click the "+" button & you reserve the computer's IP address by EITHER its MAC address (= shown in SysPrefs/Network/Advanced/Hardware) OR a DHCP client id (which you choose yourself) & enter exactly the same identical passphrase on the computer in sysprefs/network/advanced/DHCP(->set ro "using DHCP") shows textbox to enter the DHCP id
THEN apply with Update button (Router restarts)
Computer itself - under sysprefs / network -> Configure IPv4 to "Using DHCP with Manual Address" (will autofill from DHCP) check correct local IP address of computer is set & click Apply OR "Manual Address & manually enter the settings for local IP Address of computer / subnet mask / router's Ip address / DNS server's IP address / (DNS) Search Domain (optional)
Since setting static address this problem has not re-occurred.
Thanks to MacFixit there is a terminal fix here (from Sept 09) as well : http://reviews.cnet.com/8301-13727_7-10362633-263.html?part=rss&tag=feed&subj=Ma cFixIt

What does this mean? This computer's local hostname "Linda-Daviss-iMac-4.local" is already in use on this network. The name has been changed to "Linda-Daviss-iMac-5.local".

What does this mean: This computer’s local hostname “Linda-Daviss-iMac-4.local” is already in use on this network. The name has been changed to “Linda-Daviss-iMac-5.local”.
When I came back to my computer this message was on the screen. Should I be concerned ? or doing something?

Sometimes this message means that you have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. Disconnect the Ethernet cable or turn off Wi-Fi.
Sometimes it happens because 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.
Rename the computer in the Sharing preference pane.

Should I ok "this computer's local hostname Irma-Mac-mini-local" is already in use on this network. The name has been changed to Irma2 Mac-mini 2-local

Should I ok this message-this computer's local hostname Irma's Mac-mini-local is already in use on this network. The name has been changed to Irma's Mac-mini-2local

Don't think this is a conflict with IP Addresses or computer names
= DHCP hangover when computer renews DHCP lease
There is no actual other computer
It just appears that way when reconnects so creates new -2 computer name
What types of names do you use your computers ?
Whether you name them after quantum particles or the romantic poets...
They will each start to be appended with "-2" then "-3" etc if you auto configure network settings from Airport Router DHCP service and you have this Change computer name issue where pop up window states name is already being used on your LAN
As stated previous post you can reset the computer name in SysPrefs / Sharing / Edit button
And restart Router or renew all DHCP leases (if persists in not allowing original name)
Can now press Edit and reset name of choice
But for Fix see link above

I recently got a message on my screen that says "the name of your computer is already in use on this network. The name has been changed to *

I recently got a message with an exclamation mark stating "your computer name is already in use on this network. The name has been changed to ______"
How did this happen, is it phishing, malware, or did someone hit some button on here to change it. I'm hoping that someone else doesn't have access to everything on my computer now. Help!

Hello RaptorTrish,
Interesting name! You don't say what computer you are using, the OS or the nature of the network, home, office etc. Could you fill in a few details.
You are right to be concerned but there is often a simple explanation.

New behavior: Computer's local hostname is already in use...

Recently when waking my Macbook Pro I get the following dialog...
...there is no other computer on the network with the same name. This is new behavior, what would cause this dialog to appear?

Yes this has been plaguing me since the 10.5.8 update. I found the following, I don't know whether it fixes this problem but it certainly doesn't cause any harm as far as I can see.
http://www.elharo.com/blog/mac/2005/11/29/setting-a-permanent-host-name-in-mac-o s-x/
It involves editing /etc/hostconfig. Do this at your own risk.

Why would this appear on my screen? This computer's local hostname "Lloyds-iMac-4.local" is already in use on this network. The name has been changed to "Lloyds-iMac-5.local".

This popped up on my screen. No idea why. Have i been hacked?

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.

Why do I get the messagehis cowhy do I get the messageThis computer's local hostname "lenajs-imac.local" is alreamputer's local hostname "lenajs-imac.local" is already in use on this network. The name has been changed to "lenajs-imac-2.local".

why do I get the message "this computers local host name ______is already in use by the network

Usually this message means that you may have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. Disconnect the Ethernet cable or turn off Wi-Fi. If that's not the issue, shut down any virtual machines (Parallels, VMware, or VirtualBox) that are running. Rename the computer in the Sharing preference pane.

The name of your computer "Alpha (3376)" is already in use on this network. The name has been changed to "Alpha (6759)". Why do I keep getting this message?

I keep getting this message every time I log in. Why? I have an iMac with sharing on for my networked printer and to share file between the iMac and my MacBook. Can anyone help?

This is an annoying but not disastrous thing. Your computer sends messages on your home network and each message includes its name. If your computer is restarted or if it goes to sleep and wakes up all those messages should now gone but sometimes when the computer reconnects to the network it picks up a message with its name in it. Your computer doesn't realize its an old message from itself, it thinks the message is from a computer with the same name and that's not permitted so your computer's name is automatically changed.
Temporary solution (or not): turn everything off - your computers, printers, internet modem and router; any and all devices that are connected to your network. Then restart them. I hear about this issue all the time and this solution has been temporary for some people (days, weeks, or months) and for others it has seemingly solved it totally.

The name of your computer "name(7)" is already in use on this network. The name has been changed to "name (10)".

I know why this happens - there are two network connections to the same network. One is wi-fi, the other is ethernet.
I can stop it happening by turning off wi-fi.
I'd rather keep both connections, though.
Is there a way of adjusting this so it stops doing it?
Should I be using the route command to set up different routes to the two links?
If so, what's the best way to do this?

I thought about it ...
The name of the computer have different meaning.
Normally, the computer name, or in this case 'hostname' refer to the RFC of DNS, Domain Name System IP Service, that resolving 'speaking names' to IP adresses. If your Computer is a Part of the global, Public Internet and so listed on a Public Domain Name Server, the function 'global hostnames' should bei used.
The local hostname refers to the apple Bonjour Service, to solve local network units. (http://support.apple.com/kb/ph3763)
The need of different interface names for your Computer sounds strange to me, because the name represent the same machine, the same services your computer offer in your Network.
I had similar symptoms in my network, because i Need to use both interfaces (ETH an WLAN). But, this problems were related to adress conflicts, refresh time of routing tables in my network. Since i use static IP adresses for my mac interfaces, all things ok and i never seen again any problems.

"name of computer "ABC" is already in use on this network...

"The name has been changed to "XXX"
I regularly get this message from the Time Machine backup process.
Why? What should I do to correct this?
Thanks a bunch.

Sometimes this message means that you have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. Disconnect the Ethernet cable or turn off Wi-Fi.
Sometimes it happens because 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.
Rename the computer in the Sharing preference pane.

HT5167 Error after 10.7.4 upgrade..."computer's local hostname ........is already in use on this network. The name has been changed to...... What to do now to get it back to status before 10.7.4 upgrade?

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