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!

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[Click Here|http://www.saptechies.com/changing-host-name-on-r3-host-what-do-you-do/]
Also take a look at this SDN thread, you might find something interesting.
[click here for SDN thread|How to change the hostname was set/defined in SAP system?;
Edited by: santra.anirban on Sep 13, 2010 10:45 AM

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