Microsoft has disabled the Remote Mailslot legacy protocol by default in Windows 11 build 25314. A senior Microsoft manager has called it "disgusting" and "crap", saying that it will be removed soon.
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Microsoft has made an important change in recent Windows 11 Pro Insider Preview builds by disabling SMB guest authentication fallbacks by default. This has been done to improve the security of the OS.
Microsoft announced its latest efforts to phase out the old and outdated SMB1 standard in various Windows versions. Now all Windows 11 Home preview builds ship with SMB1 off by default.