Technical Tip: ISDB lookups failing on entry-level platforms, despite the database being installed correctly

[johnathan]

Description	This article describes how to resolve a scenario where ISDB lookups seem to be failing, but the ISDB database is installed correctly.
Scope	FortiOS v7.2.10 and earlier.
Solution	Under certain circumstances, when using an Entry-level FortiGate model (FortiGate models numbered from 30 to 90), ISDB queries may start to fail when on a version below 7.2.11. Policies with ISDB entries will no longer be matched, and manual lookups will fail: FortiGate # diagnose internet-service match root 1.1.1.1 255.255.255.255 <no output> Errors such as those seen below may also be seen when running 'execute internet-service4 refresh': FortiGate # execute internet-service4 refresh Internet Service IPv4 refresh start ... Start to initialize APP file. Start to initialize MAP file. Internet Service failed to refresh. ret=-4 (kernel error) When checking 'diagnose autoupdate versions', the ISDB database is present: FortiGate # diagnose autoupdate versions ... Internet-service Standard Database --------- Version: 7.04307 signed Contract Expiry Date: n/a Last Updated using scheduled update on Sat Aug 23 03:16:10 2025 Last Update Attempt: Mon Aug 25 11:16:16 2025 Result: No Updates This behavior has been addressed in FortiOS version 7.2.11.