Hi,
no we support ecdsa-sha2-nistp256 and ecdsa-sha2-nistp384 but not nistp521. Note that it is supported only in NET Core and NET Framework 4+ version, and support is partial - in rare cases exception is thrown for invalid signature so we put them at the end of client offer list.
We could add nistp521 if needed with same limitation - if connection fails with 'signature invalid', reconnect. Would that help?
Jasmine
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