Discovery error: "Data storage error: An error occurred during the writing of the data to the database. ActiveDIrectory:LDAP://DC=Contoso,DC=com. Error: The database disk image is malformed." (4369525)

This is generally caused by the SQLite DB on the node becoming corrupted. The corruption can be caused by any number of reasons such as:

• Multiple handles open to the SQLite DB
• Insufficient space for the files in the temp folders to grow
• Antivirus possibly causing issues by scanning these files/folders, or blocking certain activities
• If these folders are synced with a cloud service such as OneDrive

1. Stop the node service
2. Stop the ER Server service
3. On the node machine, delete the temp folders: C:\users\<node service account>\AppData\Local\ERData and C:\users\<node service account>\AppData\Local\ERMasterData
4.  Start the ER Server service
5.  Start the node service and confirm the previously deleted temp folders have been recreated
6.  Run only the previously failing discovery to confirm that the issue is now resolved

• Ensure the disk has sufficient space for the files in the temp folders to grow
• Add Antivirus exceptions for the folders C:\users\<node service account>\AppData\Local\ERData and C:\users\<node service account>\AppData\Local\ERMasterData
• Add Antivirus exceptions for the file extensions "cdf" and "mcdf"
• Ensure the folders are not in scope for any synching software, such as OneDrive