Technical Tip : Allowed ECC Certificates under FIPS mode

When FIPS mode is enabled in the FortiOS some already imported  ECC (Elliptical curve cryptography) certificates might not work as intended.

As the FortiGate under this mode will only allow ECC certificates using ECDSA Elliptic curves, a digital signature algorithm using NIST curves will be as follows: (P192, P-224, P-256, P-384 and P-521).

More regarding the approved ECDSA approved curves can be read in NIST.FIPS.186-4.
See the image below for an example of an unapproved ECDSA Certificate using brainpool curves instead of NIST curves: