If I use > openssl s_client -connect nc-mcd.helmholtz-muenchen.de:443 I get a connection using TLSv1.2. So far, so good. If your client cannot connect, maybe it is old and wants to talk SSLv3 which is no longer supported? Your settings look fine otherwise, afaict. - Stefan > Am 27.11.2020 um 16:34 schrieb Lentes, Bernd <bernd.lentes@xxxxxxxxxxxxxxxxxxxxx>: > > nc-mcd.helmholtz-muenchen.de:443) --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx