Online services for the Wii were shut down years ago, since then all you'll get is that error 23400. All you can do now is redownload WiiWare or Virtual Console titles you've previously purchased from the Wii Shop if you use your Wii NAND with Dolphin, the Nintendo Pay & Play (for DLCs and in-game stores) is gone and there's no replacement, as well as Nintendo WFC (for online play), but for the latter you can patch the game to use Wiimmfi servers instead...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)