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OpenSSH for Windows giving error 'server_accept_loop, posix_spawn failed' during high load

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We have an SFTP server running using OpenSSH for Windows, with basically the default settings.

An automated client, which I have no control over, sends thousands of XML files at once, and uses a separated connection for each file (open, drop file, close).

This results in the server getting hammered by 20+ connections per second, spiking the CPU up to 80 - 100%. Now this wouldn't be a problem, but I occasionally see the error 'server_accept_loop, posix_spawn failed' appear in the error log, resulting in data loss.

I'm expecting this error and the hammering of the server to be related to each other, but I have no idea what I can do to prevent this.

mangohost

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