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I followed to a T the instructions creating a minimal netinstall image and captured it using Composer, then used SIU to create the netboot image. I also enabled diskless netboot for the NBI. When I boot to it and launch Casper Imaging the selected configuration immediately fails when it tries to block copy the image with the NilObjectException error.



I verified this does not occur when running the same job booted to an external drive with Lion installed, so it apparently is rooted in the netboot image I made. I am not sure what the issue could be because as I said I followed the steps exactly as provided by the knowledge base. I have a vague sense it may be a read/write error but composer does not allow you to specify that IIRC.



Any ideas? I have a support ticket open but the thought is because it is the NBI I may be on my own.

@mikethompsett][/url thanks for the post about the permissions on the NetBootClients0.



2) Make the NetbootClients0 share have Read/Write to everyone!
I.e. path if using the default location /Library/NetBoot/NetbootClients0/



Along with setting the image available for diskless booting its now working for me.



OSX Server 10.10 Casper Imaging 9.2 and JSS 9.6

We started experiencing this issue after creating a new NetBoot Image (10.9.5) following our JSS update to 9.63, which we are running off of a NetSUS appliance. After too many days of troubleshooting and frustration I found this thread and successfully resolved the issue with a combination of the advice given by @Jpcorzo][/url and @mikethompsett][/url:




  1. Make the NetbootClients0 share have Read/Write to everyone!


  2. Rename your current rc.netboot and paste the one available from utah.edu (http://bit.ly/1vkKBMR) into the NBI image




After taking these steps we are no longer getting this error message and are currently imaging happily. I spoke to one of our JAMF reps and told him how we fixed it and he was super familiar with the utah.edu article, so even JAMF is aware of this resource and solution.

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