Issue

Users with names starting with Anonymous_* are observed being created and removed daily in the application's database backups. Their creation time coincides with the execution of scheduled events, leading to questions about whether these users are system-generated as part of scheduled event execution or another background process.

Environment

Applications hosted in any deployment type

Cause

The Mendix runtime periodically performs background operations using system sessions. These operations include cleaning up sessions, cleaning up unreferenced files, checking the status of other nodes in a cluster, and determining whether any scheduled events or task queue tasks need to be executed. The Anonymous_* users visible in the database are the system sessions created for these internal background operations. This is expected runtime behaviour and not related to end-user anonymous access, though the creation and removal pattern may coincide with scheduled event execution times.

Solution / Workaround

No action is required. The appearance and disappearance of Anonymous_* users is normal and expected Mendix runtime behaviour. 

Additional information

• Mendix documentation
  • Scheduled Events
  • Runtime Server 

• Related KBA:
  • Concurrent anonymous user sessions