ECC Curve Order

This policy setting determines the priority order of ECC curves used with ECDHE cipher suites.

If you enable this policy setting, ECC curves are prioritized in the order specified.(Enter one Curve name per line)

If you disable or do not configure this policy setting, the default ECC curve order is used.

Default Curve Order
============
NistP256
NistP384

To See all the curves supported on the system, Use the following command:

CertUtil.exe -DisplayEccCurve

Type the ECC curve names in the preferred order (one curve name per line)

Registry Hive	HKEY_LOCAL_MACHINE
Registry Path	SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002
Value Name	EccCurves
Value Type	REG_MULTI_SZ
Default Value