max_user_connections for tools on labs is 10 by default. This is too low for the RENDER tools. Please increase the limit to something like 512 or remove it for SQL users 50380g50613 and p50380g50454, i.e. render and render-tests.
We need to publish the tools for the evaluation phase asap so this is urgent.
A limit of 10 will be too low for many projects. It should be increased for all tools. On the toolserver, there was no limit for MMPs.