> `tls ecdhe "X25519"` gives the OK to the configuration, but the site then > fails to load in Chromium 58.0.3029.96 or Firefox 53.0.2, which should both > have X25519 support.
A little more context. `$ doas httpd -n` and `$ doas rcctl reload httpd` give the OK with either `tls ecdhe "x25519"` or `tls ecdhe "X25519"` In /var/log/daemon and /var/log/messages it gives: For `tls ecdhe "x25519"`: httpd[99096]: server_tls_init: failed to set tls ecdhe curve: invalid ecdhe curve 'x25519' For `tls ecdhe "X25519"`: httpd[99096]: server_tls_init: failed to configure tls - failed to set ECDHE curve
