Windows 11 puts 'disgusting' Remote Mailslots protocol out of its misery
Microsoft recently outlined several new features it is building into Windows 11, from file recommendations and one-keystroke shortcuts for the XAML context menu in File Explorer to Local Security Authority protection against secrets and credential thefts.released to the Canary Channel was the first step in dismantling Remote Mailslots, a decades-old legacy interprocess communications protocol with roots in LAN Manager DOS – or the days before Windows NT.
A client can write data to it by name and only the server can read the mailslot. The server creating a mailslot receives a mailslot handle, which is used when a process reads messages from the mailslot. There are limitations. The data in a mailslot can't be larger than 424 bytes – and once the handles to a mailslot are closed, the mailslot and all the data inside are deleted.
The problem, Pyle wrote, is that Remote Mailslot is a"simple, unreliable, insecure, and unidirectional" protocol whose time has passed. Given that, starting with the latest Insider Preview Build, Remote Mailslot is being disabled by default. Those using Remote Mailslot are seemingly tied to the old ways of doing things. To use Remote Mailslot, a person also needs to be using the Server Message Block 1 protocol, which was disabled by default and superseded in 2007 by SMB2, so about 99.97 percent of Windows users are not affected, Pyle wrote.
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