Good news! 3rd printer had the same issue, but working with HP Support, they had an email bulletin over the weekend which explained the default password is not Admin/[Blank] like in the user manual and firmware upgrade instructions: It’s actually the WPS PIN Code without a dash So to make this work: Click Menu (...) button on the printer Select (4. Network) using the arrow keys, then press OK Select (Wi-Fi), then press OK Select (WPS), then click OK Select (PIN), then press OK The screen will show an 8 digit code: xxxx-xxxx Within 2 minutes, go to the Embedded Web Server page on your computer In the top right, click login Enter the ID as admin (All Lowercase) Enter the password as the 8 digits of the PIN Code, without the dash The printer will (Finally) log in as an administrator, letting you set a new password, upgrade the firmware, and Set the Wifi details manually. ---- This is such a silly problem, all caused by HP having incorrect user manuals and Firmware Update instructions on their website. I've gently suggested to them they update the documents to stop more working printers being returned faulty. More on reddit.com

Restarting the management controller shouldn't restart the storage controller. Maybe they just have that message because they don't know which you're doing. Restarting the MC shouldn't affect anything but your connection for a short time. More on reddit.com

I want to have dynamic dns applied on them so we can use hostnames for things like VNC

Explain what you mean.

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