Microsoft’s chief project manager Ned Pyle recently said that in latest Canary Channel version legacy Remote Mailslot protocol has been disabled by default It will soon be deprecated eventually permanently removed
Remote Mailslot is an ancient protocol belonging LAN Manager DOS era It follows a communication process where mailslot server creates a mailslot that client can write data but not more than 424 bytes Starting from build 25314 released on Canary Channel channel Remote Mailslot is disabled by default but can still be run using PowerShell command (PS C:> Set-SmbClientConfiguration -EnableMailslots $true
) but obviously this poses a security risk.
