If you do /setidletimeout to a high number, such as anything greater or equal to 107375, you instantly get kicked whenever you try to log on.
Linked issues
is cloned by 2
is duplicated by 1
Comments 7
Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
An idle timeout of 74 days is more than enough, probably longer than the uptime of even the most stable Minecraft servers.
What is an affected "high number"?