This computers local hostname is already in use?

I turned on my computer this afternoon and was met with this message:
"This computer's local hostname "Name of my hard drive.local" is already in use on this network. The name has been changed to "The name of my hard drive-2.local"
To change the local hostname, open System Preferences and click Sharing, then click "Edit" and type the name in the Local Hostname field."
Can anyone tell me why is this happening? I've never seen this before. Has my computer been compromised?
Thanks

Sorry--I missed that first time around. I think you would do better by reposting in the Forum for OS10.5. You have a software issue and that forum will have more software gurus. Machine-specific forums are better for hardware issues, but I think your hardwre is probably fine.
If you wish, I can ask the Hosts to move this for you so you need not do anything. Let me know.
OSX 10.5 forum is here:
Mac OS X v10.5 Leopard

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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

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."

Local Hostname is already in use on this network

Hi,
Since upgrading to OS X 10.8 and then 10.8.1, I receive the following message when waking the iMac from sleep, "This computer's local hostname (see screen shot below) is already in use on this network". Earlier today, I went into the "Sharing" properties and changed the hostname to ShaneiMac and as you can see from the screen shot, it just renames it with a -2. It doesn't appear to be causing any issue in regards to performance of the machine but it's getting annoying. Is there any way to fix this?
Thanks.

Then this fix may work for you!
Warning, this may break your ability to use back to my mac.
Open Network preferences, select your network port (Airport or Ethernet) and click on the Advanced button. Click on the TCP/IP tab and set the Configure IPv6 drop down menu to Off. If you use both ports then make the same change for both ports.
Open Sharing preferences and reset your Computer Name.

Keep getting error message about my computers local host name already in use

I keep getting the following random error message popping up on my desktop. The last time it said the same thing, but imac-2.local? Haven't changed anything to my knowledge.
This computer’s local hostname “glen-cumbuss-imac-2.local” is already in use on this network. The name has been changed to “XXXXX-XXXXXXX-imac-3.local”.

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.
If that's not the issue, shut down any virtual machines (Parallels, VMware, or VirtualBox) that are running.
Sometimes there's no identifiable reason for the behavior.
Rename the computer in the Sharing preference pane.

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.

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.

Local host name already in use

I routinely get a message saying "local host name is already in use on this network. The name has ben changed to...."

Is this a home network or a workplace network?
If you open up terminal.
Go to Applications> Utilities> Terminal and type in hostname
what comes up?

I tried to upload a new addon to amo, but it says after clicking continue on step 2 that "This add-on name is already in use", however I get no search results. ("sese", also tried renaming "selsea")

Is there a tool to check for available names? What exactly should i rename - the file or the ID within the XPI?

Try asking in the Addons forum. <br />
https://forums.addons.mozilla.org/

Computers local host name is already in use

I keep getting a message that states "This Computers local hostname [my i-mac name] is already in use on this network.
The name has been changed to [my i-mac name-2].
This happens a lot and I am now up to [my-imac name-88]
Do I have the settings wrong? Can anyone help me so that this doesnt continue.
I am not sure if someone is trying to gain access to my mac or not?
Thanks

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.

Local Hostname Duplication

I am using an Imac connected to the internet via Airport Extreme, which is in turn connected to a modem from my ISP (transmission via phone lines - ISP is called Streamyx here in Malaysia). Normally I do not disconnect from the internet as the account is "always on". Quite often, when I get back on the computer after a period of inactivity, I get the following message:
"This computers local hostname "my-imac.139.local" is already in use on this network. The name has been changed to "my-imac.184.local"
Why does this happen and how do I stop it?? Any help much appreciated

HI and Welcome to Apple Discussions...
With the Mail application open, from the Menu Bar, click Mailbox/Rebuild and see if that helps.
*"Rebuilding a mailbox can take awhile; it’s recommended for fast Internet connections only."*
Carolyn

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 Specified name is already in use while activating Publishing feature at site collection level in Moss2007

Hi,
Please suggest on this "The Specified name is already in use while activating Publishing feature at site collection level in Moss2007"
The specified name is already in use.
A list, survey, discussion board, or document library cannot have the same name as another list, survey, discussion board, or document library in this Web site. Use your browser's Back button, and type a new name. at Microsoft.SharePoint.Library.SPRequestInternalClass.CreateList(String
bstrWebUrl, String bstrTitle, String bstrDescription, String bstrListUrl, String bstrFeatureId, Int32 lTemplateID, String bstrDocTemplateType, ListQuickLaunchOptions qlOpt)
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there are some OutBox list/libraries being created when you activate publishing features, make sure those names not being used: check this post for more detail..
http://social.technet.microsoft.com/Forums/sharepoint/en-US/f7e93d26-c2a1-42c2-b191-dc48f734684b/the-specified-name-is-already-in-use-error?forum=sharepointgenerallegacy
Please remember to mark your question as answered &Vote helpful,if this solves/helps your problem. ****************************************************************************************** Thanks -WS MCITP(SharePoint 2010, 2013) Blog: http://wscheema.com/blog

N95: Messaging Error --"Messaging:Already in use!"

Hi all...
I need ur help... My phone cant open messaging part.. If i try to do so, then this message will appear " Messaging: Already in use!".. i've tried *#7370# to restore it but still the same problem is still happen.. What should i do? please help me...
Solved!
Go to Solution.

no i do not think it is a virus. did you try updating to the latest firmware for your phone? it should be v. 30 or v.31....
to check your version plug in *#0000# and post here what version you have
also DID YOU REMOVE your memory card? and tried to plug in the *#7370# code? also try taking the battery out for 5 min or so after you perform reformat code. after 5 minutes put it all back together without the memory card and turn it on and see if there is any change.
Message Edited by radical24 on 31-Jan-2009 10:16 AM
Message Edited by radical24 on 31-Jan-2009 10:17 AM
You know what I love about you the most, the fact that you are not me ! In love with technology and all that it can offer. Join me in discovery....

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 computers local hostname is already in use?

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