Started asking to "Enter Network Credentials"

[Windows Server]

I have 2 computers plugged into the same router.For ages they have been able to transfer files between them with no problem.But today they won't connect and a dialog appears saying "Enter network credentials": Any idea why this has started happening?And what credentials am I supposed to use?One computer is Windows 11, the other is Windows 10.On both computers, in Advanced network settings, "Password protected sharing" is Off.Looking in Credential Manager on the W11 computer, there are "No Windows credentials".On the W10 computer, there is one.

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