Error 50005 in Cummins INSITE software is a communication timeout error. It indicates that the software attempted to send a command to the Electronic Control Module (ECM) via the data link, but the ECM did not respond within the expected time window. This is a generic "no response" error rather than a specific ECM fault.
Insite stores license information in hidden folders on your C: drive. If these files become corrupted due to a sudden power loss, improper shutdown, or malware scan, the software cannot read your permissions.