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HP ZBook Power 15.6 inch G9 Mobile Workstation PC (4T501AV)

 HP Thunderbolt Dockingstation 280W G4 (4J0G4AA) connected to ZBook Power G9 (6B8C4EA), Ethernet connected to Dock: USB and Displays are working well, but we do not get ethernet connection (no valid IP Configuration, network link disconnected, DHCP not working, etc.). Ethernet attached to Notebook - everything ok. Latest drivers for Dock and ZBook are installed (especially BIOS and Network - I225-LMvP).

Did not find anything concerning this in Posts so far. 

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