On 29 July 2018 at 23:39 ѽ҉ᶬḳ℠ <vtol@gmx.net> wrote:
facing [ no shared cipher ] error with EC private keys. the client connecting to your instance has to support ecdsa
It does - Thunderbird 60.0b10 (64-bit)
[ security.ssl3.ecdhe_ecdsa_aes_256_gcm_sha384;true ]
It seems there is a difference between the private key (rsa vs. ecc -> SSL_CTX?) used for the certificate signing request and the signed certificate.
The csr created from a private key with [ openssl genpkey -algorithm RSA ] and signed by a CA with [ ecdhe_ecdsa ] works with no error.
But as stated in the initial message it does not work if the private key for the csr is generated with [ openssl ecparam -name brainpoolP512t1 -genkey ].
Can you try, with your ECC cert,
openssl s_client -connect server:143 -starttls imap
and paste result?
Aki