[stunnel-users] Allowing only TLS 1.2 and 1.3

STOSSE Florian (SAFRAN AEROSYSTEMS) florian.stosse at safrangroup.com
Thu Jul 30 11:32:23 CEST 2020

Hello all,


I currently use the following parameters to achieve exactly the same objective:


sslVersionMin = TLSv1.2

sslVersionMax = TLSv1.3


In fact, here is my full tls.conf file:


; TLS Configuration file


sslVersionMin = TLSv1.2

sslVersionMax = TLSv1.3

ciphersuites = TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384


curves = X25519:P-256:X448:P-521:P-384


options = NO_TICKET


Nothing fancy, and it works as expected. Maybe you are overriding your parameters somewhere else ?


Best regards,


Florian Stosse

Information security engineer

Safran Electronics & Defense | Safran Data Systems | Space & Communication


Phone: +33 1 69 82 79 43 • Mobile : +33 6 48 11 16 12


Safran Data Systems

5, avenue des Andes - CS 90101

91978 Courtaboeuf Cedex, France



De : stunnel-users [mailto:stunnel-users-bounces at stunnel.org] De la part de Jorge Bastos
Envoyé : jeudi 30 juillet 2020 10:17
À : Thomas Eifert
Cc : stunnel-users at stunnel.org
Objet : Re: [stunnel-users] Allowing only TLS 1.2 and 1.3



; Use sslVersionMax or sslVersionMin option instead of disabling specific TLS protocol versions when compiled
;           with OpenSSL 1.1.0 or later.

sslVersionMin = TLSv1.2


Produced no efect, openssl is 1.1.1g

any idea?


On 2020-07-30 0:54, Thomas Eifert wrote:


There's also an sslVersionMax  if you feel you need it.

On 7/29/2020 5:20 PM, Jorge Bastos wrote:


I've been trying to configure stunnel to provide only TLS 1.2 and 1.3, but no sucess.
I have the configuration bellow, what could i be doing wrong?

Thanks in advanced,

sslVersion = all
options    = NO_SSLv2
options    = NO_SSLv3
options    = NO_TLSv1
options    = NO_TLSv1.1







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