DNS or Local Host Name Issue

I have an iMac, 10.6.2 that continues to get a duplicate IP address error. I have determined that this iMac is seeing itself as another machine on the network, hence the duplicate IP error. I have changed the local host name under system preferences -->network (and in sharing) to imac10.6.2-username However, on the WINS tab of system preferences-->network the computer name shows as imac 9B14C4. I have manually changed this on the WINS tab and but it doesn't actually change it. I have flushed DNS and used the scutil--gethostname command to no avail. Additionally, this iMac does not show up when browsing the network from any machine on the network. All other Macs here do. Any suggestions?
Message was edited by: EricWeiner
Actually I can browse to it through the network by either the DNS name or the WINS name, even though I tried to make them the same.

I use a Mac mini as a small AV server, and have exactly the same issue. Message keeps popping up at least once a day. Changing name in Preferences doesn't make any difference. After a few weeks it's gone from 'Centerstage' to 'Centerstage-8'. I even formatted the HD and installed Leopard and after that Snow Leopard. Didn't solve anything. Very irritating. Apple only recognizes this as a Mac OS X server issue.
Help.

Similar Messages

Local host name message pops up on start up

I've started getting message on start up saying "local host name is already in use, do you want to change"
this just began happening.
what does this mean and how can i fix it from poping up?
thanks

Hey R%%^Y,
Thanks for the question. It sounds like another computer on your network may have a similar local hostname. You can change your hostname in System Preferences > Sharing:
OS X Mavericks: Find your computer’s name and address
http://support.apple.com/kb/PH13790
Local hostname: Your computer’s local hostname, or local network name, is displayed on your local network so others on the network can connect to your Mac.
Your computer’s local network name is displayed beneath the computer’s name at the top of Sharing preferences.
The local network name is your computer’s name with “.local” added, and any spaces are replaced with hyphens (-). For example, if your computer’s name is My Computer, your local network name is “My-Computer.local.” Local network names are not case sensitive, so “my-computer.local” is the same as “My-Computer.local.”
Thanks,
Matt M.

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?

New Local host names

I am brand new to macs and still don't have a lot of it down yet, so this question may seem pretty simple.
When I turn on my mac, it has started telling me that my local-host-name is already being used and that I need to use a new one. For example:
XXXXXXXXX-2.local is already being used, please use XXXXXXXX-3.local etc.
That's not the exact wording but the basic idea of it. I think that it's affecting my ability to connect to my external harddrive through my router.
Thanks,
macbook Mac OS X (10.4.9)

My computer has a name unique to my network "John Smith's Computer" however this message appears below
Other computers on your local subnet can access your computer at john-smiths-computer-5.local
Is this alright? I would think that this isn't how it should operate. Is there a way that I can close/log-off of x-x-computer-5.local?

System tried to change local host name

A screen message with an exclamation mark showed up on my Mac Mini screen this morning which says: This computer's local hostname . . . is already in use on the network. The name has been changed to . . . (then inserted the current host name (# 2). I don't know what to make of this, and fear some kind of hacking. If this could be the case what can I do to find out? The only other thing I can think of is that I left my Time Machine on & it tried to do a full backup with my backup drive full. Anyone else have this happen?

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".
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.
Rename the computer in the Sharing preference pane.

Local DNS setup (sync host names with router?)

I'm setting up dns on a mac mini running lion server. My goal is to be able to ping host.domain both in my home, and remotely via vpn. I could enter each record manually, but I'd like to have each hostname added automatically (I want to be able to ping machines that are joined to my network by host.domain.)
I found that if I host DHCP on the server, then I am able to achieve my goal. However, I'd like to avoid losing DHCP services in the event of a server outage. Is it possible to have dhcp hosted on the router, dns on the server, and have my dns wishes fulfilled?

If I understand your requirement properly then the answer is yes. However if your server has an outage then even though your DHCP will continue to work via the router, your DNS server and hence DNS lookups would not meaning that pinging host.domain would fail, on top of that a server outage would mean your VPN server would also potentially be affected although in that case some routers can act as a VPN server as well.

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.

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.

Rename of local host name

Getting this message all the sudden - what is it about? This computer’s local hostname “first name -last name-iMac-6.local” is already in use on this network. The name has been changed to “first name-last name-iMac-7.local”.
thanks,

Hi, I think that happens when it loses the connection but not the info that thinks it's connected. The original connection was likey...
"first name-last name-iMac.local ”

Local host name

I have a small network using an AirPort Extreme with 2 Mac computers connected to the device by ethernet and one notebook, an iPad and an iPod Touch with wireleass connections. I am occasionally getting messages "This computer's local hostnamne "xxxx-xx.local" is already in use on this network. The name has been changed to "xxx-xx.local"." When this happens, I usually have the main computer on but the other ethernet connected commputer and the notebook are off. The iPad and iPod are on. I don't understand why this message appears. It doesn't seem to effect anything. But it happens every now and then without my changing any settings.

I have a small network using an AirPort Extreme with 2 Mac computers connected to the device by ethernet and one notebook, an iPad and an iPod Touch with wireleass connections. I am occasionally getting messages "This computer's local hostnamne "xxxx-xx.local" is already in use on this network. The name has been changed to "xxx-xx.local"." When this happens, I usually have the main computer on but the other ethernet connected commputer and the notebook are off. The iPad and iPod are on. I don't understand why this message appears. It doesn't seem to effect anything. But it happens every now and then without my changing any settings.

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.

Changing local host name

I would like to change my command prompt at the terminal window. At present it is shown as <mycompletename@XXXXXXX>
where "mycompletename" is well my name and xxxxxxxxx are some alpha numeric characters. How can i get rid of this alphanumberic characters? i tried using hostname -s XXX, but its not permanent. Some more searching said to change hostconfig in /etc, but i dont see anything as HOSTNAME-AUTOMATIC, in there. Another option which works is PS1='something', however, this is also not permanent. I am not sure what else i can do to change name of command prompt to show myname@somethingdifferent.
Is there any thing i can do with on my .bash_profile in my home directory? or any thing else? please guide. I am the admin of the computer, however i have not set any root.
Thanks
Sudeep
MacBook2,1 Mac OS X (10.4.9)
Mac OS X (10.4.9)
Mac OS X (10.4.9)

I've checked your other thread. I fear, you misunderstood my first posting. There I said:
Add the following line:
HOSTNAME=$HOSTNAME
where $HOSTNAME is the hostname you want to set.
That means:
Replace $HOSTNAME with the actual hostname you want to give the computer. The line should finally have looked something like 'HOSTNAME=MacBook'.
Sorry, but I was under the impression you would know at least some basics in script programming and how to use variables and how to read other people's code. I guess my instructions where just not clear enough.
The problems you describe in your other thread are because the root filesystem is mounted read-only in single user mode. You need to remount the filesystem read-write before you can make any changes to files.
I just took a quick look at Google to find the neccessary commands. I've just tested it on my MacBook, worked perfectly.
1. Boot the Mac into single user mode by pressing and holding 'Command + S' during boot time.
2. When you're at the command line type the following:
/sbin/mount -wu /
That will remount the root filesystem read-write and you'll be able to edit the system files.
3. When you're done editing, save the file. If you're using vi ignore the message about not being able to safe some temp vi file. Just hit ENTER once. After that type 'exit', hit ENTER once more and the Mac should boot up fine again.

Why does my imac all of a sudden start changing "this computer's local host name"

why does my imac all of a sudden start indicating that "this computer's local hostname is already in use on this network" and then change the name

The default of the pref network.http.max-connections has been increased from 30 to 256 in Firefox 6+ versions.
Try to decrease the value of the pref <b>network.http.max-connections</b> from 256 to 30 as used in Firefox 3 versions.
*https://support.mozilla.com/kb/Firefox+never+finishes+loading+certain+websites

Cisco ASA 5505 Cannot ping local traffic and local hosts cannot get out

I have, what I believe to be, a simple issue - I must be missing something.
Site to Site VPN with Cisco ASA's. VPN is up, and remote hosts can ping the inside int of ASA (10.51.253.209).
There is a PC (10.51.253.210) plugged into e0/1.
I know the PC is configured correctly with Windows firewall tuned off.
The PC cannot get to the ouside world, and the ASA cannot ping 10.51.253.210.
I have seen this before, and I deleted VLAN 1, recreated it, and I could ping the local host without issue.
Basically, the VPN is up and running but PC 10.51.253.210 cannot get out.
Any ideas? Sanitized Config is below. Thanks !
ASA Version 7.2(4)
hostname *****
domain-name *****
enable password N7FecZuSHJlVZC2P encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
interface Vlan1
nameif Inside
security-level 100
ip address 10.51.253.209 255.255.255.248
interface Vlan2
nameif Outside
security-level 0
ip address ***** 255.255.255.248
interface Ethernet0/0
switchport access vlan 2
interface Ethernet0/1
interface Ethernet0/2
shutdown
interface Ethernet0/3
shutdown
interface Ethernet0/4
shutdown
interface Ethernet0/5
shutdown
interface Ethernet0/6
shutdown
interface Ethernet0/7
shutdown
ftp mode passive
dns server-group DefaultDNS
domain-name *****
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 10.1.7.0 255.255.255.0
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.1.10.250
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.1.3.200
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.1.3.9
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.14
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.15
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.16
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 10.1.9.0 255.255.255.0
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 10.10.9.0 255.255.255.0
access-list No_NAT extended permit ip 10.51.253.208 255.255.255.248 ***** 255.255.255.240
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 10.1.7.0 255.255.255.0
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.1.10.250
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.1.3.200
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.1.3.9
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.14
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.15
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 host 10.10.10.16
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 10.1.9.0 255.255.255.0
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 10.10.9.0 255.255.255.0
access-list Outside_VPN extended permit ip 10.51.253.208 255.255.255.248 ***** 255.255.255.240
pager lines 24
mtu Outside 1500
mtu Inside
icmp unreachable rate-limit 1 burst-size 1
icmp permit any Outside
no asdm history enable
arp timeout 14400
global (Outside) 1 interface
nat (Inside) 0 access-list No_NAT
route Outside 0.0.0.0 0.0.0.0 ***** 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
aaa authentication enable console LOCAL
aaa authentication serial console LOCAL
aaa authentication ssh console LOCAL
http server enable
no snmp-server location
no snmp-server contact
snmp-server community *****
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec transform-set DPS_Set esp-3des esp-md5-hmac
crypto map DPS_Map 10 match address Outside_VPN
crypto map DPS_Map 10 set peer *****
crypto map DPS_Map 10 set transform-set *****
crypto map DPS_Map interface Outside
crypto isakmp enable Outside
crypto isakmp policy 10
authentication pre-share
encryption 3des
hash md5
group 2
lifetime 28800
crypto isakmp policy 65535
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 Outside
ssh timeout 60
console timeout 0
management-access Inside
username test password P4ttSyrm33SV8TYp encrypted
tunnel-group ***** type ipsec-l2l
tunnel-group ***** ipsec-attributes
pre-shared-key *
class-map inspection_default
match default-inspection-traffic
policy-map type inspect dns preset_dns_map
parameters
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect netbios
inspect rsh
inspect rtsp
inspect skinny
inspect esmtp
inspect sqlnet
inspect sunrpc
inspect tftp
inspect sip
inspect xdmcp
service-policy global_policy global
prompt hostname context
Cryptochecksum:8d0adca63eab6c6c738cc4ab432f609d
: end
1500

Hi Martin,
Which way you are trying. Sending traffic via site to site is not working or traffic which you generate to outside world is not working?
But you say ASA connected interface to PC itself is not pinging that is strange. But try setting up the specific rules for the outgoing connection and check. Instead of not having any ACL.
If it is outside world the you may need to check on the NAT rules which is not correct.
If it is site to site then you may need to check few other things.
Please do rate for the helpful posts.
By
Karthik

Host Name 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 because we need to constantly change it in Sharing to share the printer etc... . 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!

I've had the same or a similar issue. My computer was constantly renaming itself with a (2) every time it booted, after a system lockup. I tracked the issue down to CD/DVD sharing... when turned off the problem went away.
When CD/DVD sharing was on, I could not change the name back to the original version, it would get rejected and immediately set back to the version with "(2)", displaying the message:
+The name of your computer "Name" is already in use on this network. The name has been changed to "Name (2)" automatically.+
With CD/DVD sharing turned off, I could name my computer whatever I liked, even back to the original name. Turning DVD/CD sharing back on again would instantly rename my Mac. It's very persistent bug!
Fortunately I found a fix. I was able to get rid of the problem by toggling Bonjour, as described here:
http://tech.karbassi.com/2007/11/06/leopard-turn-off-bonjour-mdnsresponder/
To turn Bonjour off:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
To turn it back on:
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
Toggling Bonjour (mDNSResponder) forced a reset of something on my system somewhere, and now I no longer see the issue on reboot, even with CD/DVD sharing turned on. I can turn sharing on and off at will, and my computer is never renamed. Success!
I don't think this problem has to do with CD/DVD sharing specifically... I think it's a bug in Bonjour. I've seen threads where people have complained about this issue because of printer sharing, or remote management! My guess is that a crash can cause a mDNSResponder config corruption, tricking Bonjour to share devices or services using the same name as your computer, forcing the name conflict.
In any case, I hope this fix works for you too. I know I'm a lot happier now that there isn't a lingering issue on my box!

DNS or Local Host Name Issue

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