openssl ecparam -list_curves
No, nothing special Was it some outdated browser/OS (like windows xp?).I only noticed this (I should actually read versions changelog) because a client mucked up their LE certificate...... I recreated it with the default key size and the browser complained about something (can't remember what).... So I chose 4096 and recreated it.
Do we need to do anything for these keys to work with browsers?