My computer's local hostname keeps changing - is there a solution?

I have looked into this in the community but have yet to find a resolution to this. I don't think this is a serious problem, but what do I know? The message that pops up is:
This computer's local hostname "besMac-277.local" is already in use on this network. The names has been changes to "besMac-400.local". To change the local hostname, open System Preferences and click Sharing, then click "Edit" and type the name in the Local Hostname field.
Screenshot:
The only think I can gether from reading the other posts is that having a wired ethernet connection to the router and wifi active may have something to do with it. I'm hesitant to unplug the ethernet as I would like it as a backup in case the wifi fails.
Thanks for your help!

I upgraded to Yosemite. Finder stays open and has a spinning wheel. It does not respond to Force Quit. I have spent 2 hrs. with Apple Support today on the phone. We tried to re-install Yosemite, but the time for completion started at 166 hrs. And kept increasing. So they are sending me to an Apple Store Wednesday. Others have commented on Finder problems.

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Local hostname keeps changing

Ever since upgrading to OSX Yosemite, I've noticed that several times now I have been unable to reach my iMac over LAN because the local hostname changed from "iMac.local" to "iMac2.local". This has occurred without any intervention or changes on my part and has created a serious issue with programs that have the host name hardcoded into them as they can no longer find the target machine. Has anyone else noticed this behavior?

Hi All,
I think this is a DHCP issue. When the Mac connects to a network it is doing a DHCP request and apperantly my DHCP server sends a hostname back. I deleted the entry in the server (DNS also) and now it seems to be resolved.
Kind regards,
Crash71

Local hostname keeps changing on me, please help!

Every time my mac goes to sleep OSX renames my local host name, it keeps adding a number after it. It will be Mac-Pro. Then it will name it Mac-Pro 2, then Mac-Pro 3, etc.
I only have a Mac Pro, Macbook and an Apple TV. All of them are named that way. I'm not sure why this keeps happening, it was working fine for weeks. I just hooked up my Apple TV about a week ago, the problem occurred about 3 days ago. Maybe thats just a coincidence, not sure.
Anyone know how to fix this? I can even completely rename the Mac Pro, and it still happens. It only happens on the Mac Pro.
I've used Onyx to clear out pref files and such, and also repaired permissions to no avail. Help Please!

Did you solve the problem?
Seems like a duplication of this thread:
http://discussions.info.apple.com/thread.jspa?messageID=12679124

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.

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 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

"This computer's local hostname changed".

Since installing Mountain Lion, I have twice received the following warning pop-up. "This computer's local hostname "my-name-iMac.local" is already in use on this network. The name has been changed to " my-name-iMac-2.local". In both cases the hostname is automatically changed by adding a "2" at the end. I am able to go into "sharing preferences" and change it back, however I am confused as to why this is happening on its own.

Sometimes your network router thinks your computer is still connected to the network when it isn't - most typically after a forced quit or restart but not always. I've also seen it associated with a computer going to sleep and waking up. When your computer restarts or wakes up it connects to the router and the router, in human terms says, "No that can't be. I already have a Jim here. I'll call you Jim-2."
It is slightly aggrevating but no big deal. You may solve the problem (at least temporarily) by turning off every device on your network including the router and then turning the router on again - followed by the rest of your devices.

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."

Kdcmond cannot retreive the computer's local Hostname

When I open Console, the following message appears hundreds of times in the log for today. What is this and why am I getting it?
"2/8/10 10:36:11 AM com.apple.kdcmond[158] kdcmond cannot retreive the computer's local Hostname , retrying .. "
It retries every 10 or 15 seconds, continuously...

In looking at the log file, very early in the reporting there is an entry:
" 2/8/10 9:26:04 AM org.apache.httpd[27] httpd: Could not reliably determine the server's fully qualified domain name, using ::1 for ServerName "
This entry directly precedes the first entry of:
" kdcmond cannot retreive the computer's local Hostname , retrying.. "
It seems that something in my httpd.conf file was changed and now Apache can't find the domain name. Any ideas what to look for in the httpd.conf file?

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!

CHANGE_TRACKING_MIN_VALID_VERSION keeps changing even there are no changes in that table

Hi,
We use stored procedure like below to get the data on intial load as well as subsequent changes. The underllined part of the stored procedure to get the last_sync_version is slightly different from what Microsoft has suggested. (not using CHANGE_TRACKING_CURRENT_VERSION).
That is because we download data to staging from multiple sources and from their we want to process data from one source at a time (DATA_SOURCE_KEY filter).
What we notice is that, when there is no data for a table for sometime, once the change tracking gets purged for that table, we keep hitting the condition @LastVersionId <@MinVersionId. The MIN_VALID_VERSION keeps changing even though there is no change
in that table. Looks like the MIN_VALID_VERSION is a global number and not specific to a table. Is there a problem with the way we are getting the @Next_Version. Can we use the CHANGE_TRACKING_CURRENT_VERSION even though we want to download subset of data
from the table (only records matching for one data_source_key at a time). Appreciate your answers.
CREATE PROCEDURE [dbo].[PDW_GetSiteDVAudit](@DataSourceKey AS INT,@LastVersionID AS BIGINT, @NextVersionID AS BIGINT OUTPUT)
AS
BEGIN TRY
BEGIN TRANSACTION
BEGIN
DECLARE @MinVersionID bigint = 0, @max_version bigint = 0;
SELECT @NextVersionID = 0;
SET @MinVersionID = CHANGE_TRACKING_MIN_VALID_VERSION(OBJECT_ID('dbo.SiteDVAudit'));
IF (@LastVersionID < @MinVersionID)
BEGIN
SELECT @NextVersionID = isnull(MAX(SYS_CHANGE_VERSION),@MinVersionID) from CHANGETABLE(CHANGES SiteDVAudit , NULL) CT where DataSource_Key = @DataSourceKey
SELECT
s.Id,
Site_Id ,
SiteDesc,
Deleted,
Local_Id,
s.DataSource_Key,
Data_Task_Id
FROM
dbo.SiteDVAudit s
WHERE
s.DataSource_Key = @DataSourceKey
END
ELSE
BEGIN
SELECT @NextVersionID = isnull(MAX(SYS_CHANGE_VERSION),@LastVersionID) from CHANGETABLE(CHANGES SiteDVAudit , @LastVersionID) CT where DataSource_Key = @DataSourceKey
SELECT
s.Id,
Site_Id ,
SiteDesc,
Deleted,
Local_Id,
s.DataSource_Key,
Data_Task_Id
FROM
dbo.SiteDVAudit s
RIGHT OUTER JOIN
CHANGETABLE(CHANGES SiteDVAudit, @LastVersionID) CT
ON s.Id = CT.Id AND
s.DataSource_Key = CT.DataSource_Key
WHERE
s.DataSource_Key = @DataSourceKey
END
END
COMMIT TRANSACTION
END TRY
BEGIN CATCH
ROLLBACK TRANSACTION
RETURN -1
END CATCH

My first observation is that you don't reraise the error in the CATCH handler. That is bad, because it makes the proceedure fail silently which may be very difficult to troubleshoot.
The version numbers for Change Tracking are indeed database-global. MIN_VALID_VERSION can be different for different tables, if they have different retention periods. But if they all have the same retention period, it seems likely that MIN_VALID_VERSION
would increase as the database moves on.
I'm not sure about your question Can we use the CHANGE_TRACKING_CURRENT_VERSION even though we want to download subset of data from the table (only records matching for one data_source_key at a time). Where would you use it? How would you use
it?
Erland Sommarskog, SQL Server MVP, [email protected]

HT1338 I suddenly keep getting a message my local hostname has changed.

I suddenly keep getting a warning message that my local host name has been changed. xxx-xxx-imac-#.local. The # keeps increasing. What have I done to cause this constant change?

Try temporarily disabling your firewall and anti virus software and try again...
See here for Connection Issues
http://support.apple.com/kb/TS1379
From Here
http://www.apple.com/support/itunes/troubleshooting/

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.

My computer's local hostname keeps changing - is there a solution?

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