So I have a N6700B chassis. Originally I had NIVISA 5.4 and ICP 4.6 installed. I could communicate with this device with either the ethernet or USB interface no problem. I upgraded to NIVISA 15 and ICP 15. Now the USB works fine, but I get an error when I try to use the ethernet. My preference is ethernet as I have a huge ethernet switch and limited USB ports. Oddly the failure seems consistant on two seperate systems and it always fails initialization of the fourth device in the chassis.
To prove it was the upgrade, I rolled the NIVISA and ICP back and it works again. I am using the latest driver for the N6700B chassis from keysight.