This is an older error that Fortigate was giving when it had issues with IPS engine.

How to fix the CFG_CMDBAPI_ERR error?

To fix the issue you can one of the following 2 things:

1. Upgrade the Fortigate to the latest version (request a new version from Fortinet support)

2. Reboot the IPS of the Fortigate (this is was it causing the issue). Below is the command(through CLI):

diagnose test application ipsmonitor 99    

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