I’ve been having the same issue with the G8 ProBooks and have finally got one to image throught the NIC however I’ve been through many steps so I followed this guide
https://docs.fogproject.org/en/latest/reference/compile_ipxe_binaries.html
I then re-downloaded & re-installed FogProject from github.
PXE is noticably faster and so far so good.
Whether compiling and copying the ipxe worked or whether it was the re-install or a bit of both I cannot say.
R
Posts
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RE: HP Probook G8 issues imagingposted in Hardware Compatibility
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RE: Fake folder taking up all storageposted in Linux Problems@Daniel-Miller Thank you, I’m learning both Cent and Fog at the same time, challenging but interesting, I couldnt find why I had 127Gb total storage but only 27Gb was being shown in Fog GUID so I ended up re-building the server. Appreciate the info though. 
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Fake folder taking up all storageposted in Linux ProblemsHi Hoping someone can help, quite new to Fog so learning as I go. I had to re-install our Fog server however I now have a fake directory taking up 88Gb of space, when attempting to access via Putty I’m told the directory doesn’t exist. Long story short how do I remove the contents of this directory? /dev/mapper/centos-Images 88G 33M 88G 1% /Images I’ll be completely honest i’m not sure if this is a Fog or CentOS 7 issue Thanks for any help