I had a similar problem, too. The solution that worked for me is tricky. Here is the detail of what I have done. FYI.   I have a SanDisk Cruzer Micro 2GB UsbStick running unRAID 6.9.2 on Asus P7P55D-E LX machine. CSM boot, UEFI. turned off. Nothing wrong.   Then I tried to use the same UsbStick on Gigabyte GA-MA78GM-S2H machine. This old machine only has BIOS. I can boot to unRAID, both command UI and Graphic UI, but I can't connect to unRAID WUI either from localhost or remt