Local domain suffix causing WSUS error

I have several Windows computers in my LAN, so I’m using a Windows Server as WSUS server serving Windows Updates to LAN clients. And I just flashed my router’s firmware from Tomato to OpenWRT yesterday, then I found the WSUS service broken.

“80072ee2” shows on Windows Update window, and the Windows Server Update Service remote console unable to connect to the WSUS server neither.

The 80072ee2 means there was a connectivity issue between client and server,

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