Avoid duplicate file processing in Sterling File Gateway (SFG)

The actual error we see in the logs is just the way SFTP in SI detects
duplicate files and since you have the option in the
mailbox.properties set to:

disallowDuplicateMessages=false

This means that duplicate files are allowed and therefore SFG
processed those duplicate uploads.

So the partner should investigate why did their application trigger a
duplicate upload of the same file.

If you want to avoid duplicate uploads, you should consider setting
the option disallowDuplicateMessages to true in both nodes, this will
stop SI from accepting duplicate files.

If you want to make that change, you will need to modify\create your
customer_overrides.properties on both nodes and add the following
line:
mailbox.disallowDuplicateMessages=true

Both nodes need to be restarted for the change to take effect.