In this case this TLS proxied port will be only available in internal network and will be never exposed to internet, so it is ok to use this hack until this old software without TLS 1.2 support gets replaced. Notice: Using TLS 1 and 1.1 is usally a bad idea, since both protocols have security flaws, see for example Testssl.sh output of proxied port via stunnel Testing protocols via sockets HTTP2/ALPN (HTTP/2 is a HTTP protocol and thus not tested here) SPDY/NPN (SPDY is an HTTP protocol and thus not tested here) Configuration Manager relies on many different components for secure communication.
BEST TLS VERSIONS INSTALL
This version is default on debian 10 when you install via sudo apt install stunnel. According to the 2021 TLS Telemetry Report, TLS 1. TLS 1.3, released in August 2018, is the latest version and is considered the strongest and safest of all. Ever since, it has undergone three major revisions. Stunnel 5.30 on x86_64-pc-linux-gnu platform The TLS protocol was first released in 1999. There is no need to configure anything special for SSL/TLS within stunnel. I'll add more info when further tests have been done regarding TLS versions.Ībove configuration is correct for proxying different TLS versions. Update: It works with above configuration when both entrys have protocol = smtp. Not only is TLS more secure and performant, most modern web browsers no longer support SSL 2.0 and SSL 3.0. What’s more, recent versions of TLS also offer performance benefits and other improvements. TLS, the more modern version of SSL, is secure. Currently checks security because you're only allowed to send with valid credentials. As such, SSL is not a fully secure protocol in 2019 and beyond. What am I doing wrong? Is there another tool which fits better here? I know I could setup an own mailserver which accepts TLS 1.0 and 1.1 and uses as smarthost, but that would be too much, because then I have to care about security. Here is the stunnel config: setuid = stunnel4 However I get an immediate error or some kind of timeout and Thunderbird can't sent the E-Mail. I've tried to comment them out in one or both sections. Before configuring different TLS versions I only wanted to test if this "stunnel proxy" works in general.
I have already a valid certificate for this server. Now I wanted to use stunnel to connect to SMTP server and and also listening for smtp access. However SMTP Server only supports TLS 1.2. I have a quite old software which doesn't support TLS 1.2.
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