You have Windows File Sharing checked right. That's a work around, a little insecure.
I confirmed this and filed a bug with Apple on it. With luck it'll get fixed soon.
I've already tested with an unpatched 10.13.1. File sharing works as expected there.I can file share to a Mac mini running 10.12.6 (fully updated) just fine. If I try to file share to any High Sierra machine from the Mac mini, credentials are rejected. This is simply an issue with the Security Update. I currently have a fresh install of 10.13.1 going on a test machine to narrow it down to the Security Update 2017-001 for 10.13.1.
2 weeks ago I swapped AFP for SMB. This week I did not have a single problem withYes. This problem only affected SMB sharing too. AFP was unaffected.
.... insecure ... .... WHY?Having the same issue since I've applied the patch. Interestingly, I had previously experienced this at some point running a beta version of 10.13.1.
What works for me is to activate Windows File Sharing for the account, but that seems like an insecure workaround.
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Good eye. I see they quietly released the new version. Fair enough, most users will never know what happened in the last 24 hours.