What is "Consider setting groups/curves preference with tls-groups instead of forcing a specific curve with ecdh-curve." ?

[emoxam]

What is "Consider setting groups/curves preference with tls-groups instead of forcing a specific curve with ecdh-curve." ?
I see it at the log.
Thanks

[yeezy69]

I think you should use for example

tls-ciphersuites TLS_AES_256_GCM_SHA384

instead of

ecdh-curve secp521r1

in your tunnel-config.