Getting error 300 during a dataLoader run.
Sometimes the vault connection gets closed after 30 minutes. This is due to a vault setting that automatically logs you out after 30 minutes.
The best solution is to go to your vault configuration located at
“C:\Program Files\Autodesk\ADMS Professional 2016\Server\Web\Services\Web.config” and increase the time:
<timeouts connection="120" defaultCommand="360" longCommand="1800" />
longCommand contains the time in seconds (1800s = 30min).
for more information please see the documentation from Autodesk on changing this value