Sudden message re "hostname already in use"

This morning when I opened my computer, a message was displayed saying: "This computer's local hostname "xxxx" is already in use on this network. The name has been changed to "xxxx"." I had done nothing to change the hostname. What could have caused the message to appear? Is this a sign that someone has hacked into my network somehow?

This usually means another computer on your network is using the same hostname. However, users with only one computer also report this error on occasion. It's not clear what exactly causes it to happen, but you can change it back to what you were using in the Sharing preferences pane.
You will find an interesting discussion and possibly permanent solution here: Prevent the Terminal host name from changing.

Similar Messages

Local-hostname-already-in-use message regularly appearing

I have seen some earlier posts here about this problem but no one seems to have resolved it.
Often when I wake my iMac (Intel, 10.5.4) from overnight sleep there is a message greeting me "This computer's local hostname 'XX.local' is already in use on this network. The name has been changed to 'XX-2.local'." I got as far as XX-65 the other day and thought it might be time to seek a solution.
There is a router, a laptop, and a couple of Slim Devices/Logitech Squeezeboxes on the network. None has the same name as the iMac.
It's driving me bonkers. No harm done, of course, but it's a real pain to keep changing it back to the original name, and still it keeps bombarding me with these messages.
Any thoughts, oh wise ones?

It is possible that your router is also acting a local dns server and as such caching your devices host names.
A fix for this would be to assign a fixed ip address to your mac.

Local hostname already in use - can't figure out what's going on

I've been having issues with a wireless router and I think the problem lies somewhere within my computer. As I switch back and forth from trying to connect to the internet via my router or directly connected to my cable modem, I will often get this error:
"This computer's local hostname "xyz" is already in use on this network"
There is only one compuer on the network, however and I cannot figure out what's going on.
I have 2 users set up on this machine, but I'm the admin and acting as such. Even with no other networked equipment hooked up to my Mac (except for the cable modem) this problem won't go away.
I guess my real quesiton is what causes this and where should I go to troubleshoot things?
I'm running 10.4.6, connect to my ISP using DHCP and have the same problem with both a D-Link and Linksys router.
Any ideas?
Thanks!

Thanks very much for your help, fu.
If your previous setup follows a flow like this: RCA
CableModem-->NetGear Router-->AirPortExpress, there's
something misconfigured routing-wise in your network.
You have to decide which device (Netgear or AirPort
Xpress) will handle the routing in your network.
Previous to these problems, that was the basic flow of my network. The netgear router also fed a wired connection into a Wintel PC, and the AirPort Express hosted a wireless network that was extended by a second Airport Express. And that second AE connected to a ReplayTV with a wired connection. And then, of course, the PowerBook got Internet access wirelessly through the AE-hosted network. And that was it.
That network always was configured so that the netgear router assigned IP addresses using DHCP, and the Airport Expresses would not assign IP addresses (i.e., "Distribute IP addresses" was NOT checked when you look at the configuration in Airport Admin Utility).
How big is your network j? just 1 Mac (your
PowerBook)?
That was the state of the network a couple of days ago when I posted this. I have established that the PowerBook gets access to the Internet just fine directly though the cable modem, and just fine when it is the only wired connection to the router.
Let's deal with your Mac first:
Start with your Mac connected directly to the cable
Modem. (When your mac is attached directly to the
Cable Modem, do you use DHCP?)
Go to SystemPreferences-->Sharing and type a Computer
Name other than the default one
Open Applications-->Utilities-->Terminal and type
lookupd -flushcache (press Return) and reboot
the Mac.
I did this.
One way to fix your network is to have the NetGear do
the routing, and the AirPort Express to (just) extend
your (wired) network wirelessly (No routing will be
done from the AirPortXPress, (No distribution of IP
Addresses)
I soft reset both of my Airport Expresses. I configured the first one so that it was hosting a network, but not distributing IP addresses, and the second so that it was extending that wireless network. And I plugged the host AE into the netgear router. And for a little while, that was working.
But then I got a message saying "IP Configuration 192.168.0.4 in use by 00:04:40:06:1f:82, DHCP Server 192.168.0.1". The dialog box with that message will come up periodically as long as the Airport Expresses are plugged into power and one is plugged into the router. Also, I once agaiin received the message saying the local hostname (the completely original one that I had created) was in use, and the name was being changed.
Here is the thing. I cannot figure out what has that ...0.4 IP address and ...1f:82 MAC address on the network. That is not the "Internet port MAC address" or the "LAN port MAC address" for the Netgear router. It is also not the MAC address for either of the Airport Expresses or the PowerBook's internal Ethernet card.
I accessed the router through my browser, and clicked on "Attached Devices." Here is the list of Attached Devices:
# IP Address Device Name MAC Address
1 192.168.0.2 00:11:24:08:4c:88
2 192.168.0.3 00:14:51:6d:15:7c
3 192.168.0.5 00:0a:95:da:4f:24
The first two addresses are the two AE's, and the third is the internal Ethernet card of the PowerBook.
I ran "Netstat" under the Network Utility to get "Routing Table Information," and here is what I get (with some identifying info removed):
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 192.168.0.1 UGSc 23 10 en0
127 localhost UCS 0 0 lo0
localhost localhost UH 11 2400 lo0
169.254 link#4 UCS 0 0 en0
192.168.0 link#4 UCS 3 0 en0
192.168.0.4 link#4 UHLW 1 1 en0
192.168.0.5 localhost UHS 0 14 lo0
Internet6:
Destination Gateway Flags Netif Expire
localhost link#1 UHL lo0
localhost Uc lo0
localhost link#1 UHL lo0
link#4 UC en0
justin-and-***** 0:a:95:da:4f:24 UHL lo0
**************bedro 0:14:51:6d:15:7c UHLW en0
link#5 UC en1
justin-and-***** 0:a:95:f3:3e:df UHL lo0
**************bedro 0:14:51:6d:15:7c UHLW en1
ff01:: localhost U lo0
ff02::%lo0 localhost UC lo0
ff02::%en0 link#4 UC en0
ff02::%en1 link#5 UC en1
Any ideas? Thanks again for your help.

HT3275 My back up is not occuring and I am getting the message: sparsebundle is already in use; any clues?

My back up to time machine is not occuring and I am getting the message: sparsebundle already in use. Any Clues?

This is the most common error on Mountain Lion.. at least 5 and up to 10 times a day.. I wish we had a proper method of referencing these errors.
Simply reboot the TC.
Read C12 here.
http://pondini.org/TM/Troubleshooting.html

MESSAGE THAT PROGRAM ALREADY IN USE IN ANOTHER COMPUTER

This message appears each time Contribute CS4 tries to launch, making it impossible to edit web-site. Adobe directions to disable and then remove all elements including serial number were followed without success. Computer was shut-down and relaunched with re-installation, also with no success. Adobe's own staff (when they finally answered) had no solution. Their is no other program on which the CS4 could be used and all elements of previous installation were removed for a clean re-install. Does anyone have a solution?

Change which email address, primary, alternate, rescue ?
Is the address that you want to replace it with already in use on your account e.g. as an alternate or rescue email address ? You can check, and change/remove addresses, by logging into the account via http://appleid.apple.com

Hostname Already in Use Changes?

Frequentlly, we get "this computer's local host name on the network is changed to 1234567654-1 because it determines that the original host name "is already in use." This doesn't make network peripherals and communication between our two computers very easy. When we get the notice, we change the name (number) back to the original and it seems fine for awhile and then returns...
I can find no apparent cause?
Thanks!

Frequentlly, we get "this computer's local host name on the network is changed to 1234567654-1 because it determines that the original host name "is already in use." This doesn't make network peripherals and communication between our two computers very easy. When we get the notice, we change the name (number) back to the original and it seems fine for awhile and then returns...
I can find no apparent cause?
Thanks!

Does anyone have a fix for the "Local Hostname Already in use..."-bug?

I get this message + an incremental change in hoist name upon each wakeup (iMac, not me!) from sleep. I need a permanent fix, I would not like to play with Aiport settings etc. This issue came afetr upgrade to OSX 10.7.4. Will Mountain Lion fix it?
Mike

Tuomasveturi wrote:
I get this message + an incremental change in hoist name upon each wakeup (iMac, not me!) from sleep. I need a permanent fix, I would not like to play with Aiport settings etc. This issue came afetr upgrade to OSX 10.7.4. Will Mountain Lion fix it?
Mike
Never seen it. What makes you think it is a bug? Have seen no reports of it. Sounds like it is all within your settings.
Pete

HT3275 message "spare bundle is already in use" What does this mean?

Message "sparsebundle is already in use", I just installed the Time Capsule 2 and continue to receive this message, what needs to be done to get it working properly?

It means you are using Lion or ML.. which cannot network as well as Snow Leopard could..
Use C12 and C17.. usually just reboot the TC..
http://pondini.org/TM/Troubleshooting.html

N73 Web already in use error

When attempting to open the web browser, I get a message saying web already in use when no other browser or data session is up.
Anyone know why this would be?

23-Apr-200702:40 PM
yadda wrote:
If I do that reset, are the only thing I am going to lose contacts, photos, docs etc or will it do something more major? I am getting that error and want a quick fix. I don't mind reentering phone numbers etc, but don't want to lose/reset anything complicated.
thanks for any replies
I'm not sure exactly what you will lose, but Nokia does have the Backup application within PC Suite which can make a backup of your phone before you wipe it which you can then restore back to your phone after you wiped it. However there is a possibility that it could restore the very lock file you just wiped .. which would then become a recursive problem ...
You can download PC Suite here :
here : http://www.nokia.co.uk/A4144905
Regards,
Edward

Nokia N80 Web Browser: "Web already in use"?

Just got my nokia N80, connected to my WLAN perfectly, I managed to have a couple of hours browsing the internet using the Web browser found under "My Own", I wanted to see if msn Web Messenger would work, after the login the web browser crashes.
Now if i try and get back onto the Web Browser I get a message saying "Web already in use", I've restarted the phone, I've even taken the battery out and restarted but this message still appears, I've googled and searched these forums but I can't seem to find any info on this, does anybody know what the problem is, and why the browser seems to crash on certain pages?

My new E61 was working fine but today when I tried to access the Internet I got a "Web: Already in Use" notice and could not access it. I had to hard reformat of the phone (thanks to T-Mobile tech support)and reinstall all of my email and internet settings. I have read on several user forums that this problem has occurred with some regularity. Obviously I do not want to reformat the phone all the time. Are there any other solutions? One user said they brought the phone into a local Nokia store for a software flash but did not say if it worked. Since I am in US, there is no local store to bring it to. Does have any ideas on how to solve this issue? Shouldn't Nokia be saying or doing something?

Already in use by the maximum of 2 computers.

CS6 downloaded and installed on one laptop but cannot validate with license key as system gives this message it is already in use by the maximum of 2 computers and that I need to deactivate another computer within 32767 days to use this product
This is not the case I have only downloaded it onto 1 machine. it gives me 2 options:1) retry activation, I have already deactivated 1 machine or 2) provide a different serial number. What should I do?

Contact Adobe. Nobody here can help.
An online chat should be enough to get it straightened out.

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

HT3275 Why would Backup suddenly stop and give me sparse bundle already in use error message?

The error message I keep getting is: The backup disk image “/Volumes/Data/Brenda Glim’s MacBook Pro.sparsebundle” is already in use. Help!

Because you are running ML and that is one of its bugs.
Even Lion can do it.
Wireless makes it worse.
Reboot the TC.. or reboot the network and it should go away.

WARNING: \\ hostname \sapmnt\trans\tmp\*. SID already in use (x)

Hi everybody!!
Someone can help me about the next warning when I try to make a transport from QUA to PDC. The transport doesn't pass to PDC envionment.
Best Regards
The next is the warning:
STOP tp_getprots          PRD P      20071010121848              PATROL       SAPPRD 20071010121834
STOP MOVE NAMETABS        PRD 6      20071010121848              PATROL       SAPPRD 20071010121834
START MAIN IMPORT          PRD I      20071010121848              PATROL       SAPPRD 20071010121834
START imp single           PRD        20071010125935              PATROL       SAPPRD 20071010125934
INFO TBATG CONVERSION OF PRD N      not needed                  PATROL       SAPPRD 20071010125934
START MOVE NAMETABS        PRD 6      20071010125936              PATROL       SAPPRD 20071010125934
START tp_getprots          PRD P      20071010125937              PATROL       SAPPRD 20071010125934
STOP tp_getprots          PRD P      20071010125947              PATROL       SAPPRD 20071010125934
STOP MOVE NAMETABS        PRD 6      20071010125947              PATROL       SAPPRD 20071010125934
START MAIN IMPORT          PRD I      20071010125947              PATROL       SAPPRD 20071010125934
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (10), I'm waiting 4 sec (20071010130015). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (20), I'm waiting 1 sec (20071010130039). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (30), I'm waiting 4 sec (20071010130104). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (40), I'm waiting 2 sec (20071010130135). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (50), I'm waiting 2 sec (20071010130210). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (60), I'm waiting 1 sec (20071010130246). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (70), I'm waiting 4 sec (20071010130308). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (80), I'm waiting 1 sec (20071010130345). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (90), I'm waiting 5 sec (20071010130410). My name: pid 5316
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (100), I'm waiting 3 sec (20071010130442). My name: pid 531
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (110), I'm waiting 4 sec (20071010130512). My name: pid 531
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (120), I'm waiting 3 sec (20071010130541). My name: pid 531
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (130), I'm waiting 2 sec (20071010130612). My name: pid 531
WARNING:
DEVZEUSUNE\sapmnt\trans\tmp\DEVKK954505.PRD is already in use (140), I'm waiting 2 sec (20071010130644). My name: pid 531
The PID makes a reference to the tp.exe process

Dear Friend
The transport buffer lock file (<SID>.LOB) remains locked by the operating system (OS). The file is created by tp.exe to prevent that several tp processes access simultaneously the transport buffer. The file is deleted after the tp has modified the transport buffer. As usual the <SID>.LOB is located in the
<hostname>\sapmnt\trans\tmp folder.
When the symptom occurs, the following records are written in the transport log file:
WARNING:
<hostname>\sapmnt\trans\tmp\<SID>.LOB is already in use
(XXX), I'm waiting 5 sec (20031209205043). My name: pid XXXX on YYYY.
Other terms
.LOB, opportunistic locking, lock, EnableOplocks, LanmanServer, Q296264 , already in use, semaphore
Reason and Prerequisites
The error in opportunistic locking agorithm leads to the blocked .LOB files. Before you proceed with the steps described below, make sure that you have installed the latest Windows Service Pack.
Solution
To check if the problem is caused by opportunistic locking do the following:
      1. Get the tp-process ID (PID) from content of the .LOB file.
      2. Check if the PID exists on the host where tp runs.
      If it exists, the problem is not the opportunistic locking but must be investigated by the support team.
      If the PID does not exists, perform the next step.
      3. Check with the command "net file" on the transport host if the network handle for .LOB file exists and delete it with "net file <file ID> /close".
      4. Delete the .LOB file on the transport host. If the next call of tp creates a new .LOB file and will be blocked again with the message " WARNING:
<hostname>\sapmnt\trans\tmp\ <SID>.LOB is already in use (XXX), I'm waiting 5 sec (20031209205043). My name: pid XXXX on YYYY. " perform the next step.
      5. Login to the last tp-run host with an user that differs from the tp-user and delete the .LOB file on the transport host via administrative share (<disk>$):
      del
hostname\d$\usr\sap\trans\tmp\<SID>.LOB
      After that the tp should run smoothly for some time.
If the symptoms in steps 1-5 have been verified and confirmed this is an indication for an opportunistic locking algorithm problem of the operating system. In this case, disable the opportunistic locking on the transport host by setting the registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\ Parameters
EnableOplocks to (REG_DWORD ) 0
(see also MS KB Q296264)
If the problem was not solved or any other side effects were detected, contact your Microsoft support team.
      6. After deactivating the opportunistic locking you may experience some performance problems with tp - the transport requests are running, but it takes more time than usual. Especially elder SAP systems (before 6.10) are affected.
      Reason: Implementation of the C-runtime libraries and Windows text files.
      Buffered IO functions (fread, fwrite, fgets, fseek etc) in Windows C-runtime library use a file pointer to an internal buffer in which a part of the text file is cached in a local buffer. In the Windows text file every end of the line (EOF) is marked with the escape sequence "carriage return" (CR) and "line feed" (LF). The C-RTL buffer represents the line in C-Style (LF only). Therefore a conversion of the input stream when transfering data from the file to the buffer has to eliminate all CRs. As a result of this, fseek (function returning the actual position of the filepointer) could not resolve the position with the information held in the local buffer only. It has to access the file every time, whereas the other buffered function will mainly operate on the buffer only. Switching off Opportunistic Locking disables SMB client site caching of the file. Therefore every fseek() request will result in a not cached network operation to the file. This does not happen, if the Unix like style LF is only used for representing EOF. tp and all other R/3 programs handle both formats correctly.
      Solution: In a time window where no transport activities are performed, open the buffer file with SAPPAD and choose "Tools -> Save As Unix File". Save the file and close SAPPAD. You have to repeat this every time the buffer file is newly created
shailesh Tiwari

HT3275 I get the message that backup failed because the volume is already in use. Any ideas?

My Time Machine for my iMac has suddenly developed a problem: on repeated attempts to do a backup, it returns the message that the backup failed because the volume is already in use. The solution to the problem may well be simple and obvious, but it'll be a revelation to me and any help will be gratelfully received.

Have a look at Pondini's excellent information here...
http://pondini.org/TM/Time_Capsule.html
Perhaps here...
The Backup disk image ... sparsebundle ... is already in use.

Sudden message re "hostname already in use"

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