[edubuntu] ltsp pxe-e11 arp time out problem

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http://ubuntuforums.org – Hi Sorry if here isn't right place for asking this question I have a ltsp server ( edubuntu 12.04 ) it was working fine. With any try for connecting to server, client received next ip address ( means first time and next time same client ). suddenly on I got pxe-e11 error in connecting. Nothing changed in my network. The real problem is after error happens for first time changing ip address or even connet a PC with cross cable to server I still got the error. If I replace the backup ( it is exact same as the server ) it works fine again till (Hardware)