# TLS1.0 is NOT SUPPORTED on tls1test.salesforce. This should work on any linux/unix flavor, I suspect, and definitely works on Mac, as that's what I'm using to test it $ tls_test.sh To test a web server or some other service that does not require a command to negotiate SSL/TLS, omit the -starttls option.Thanks to this great answer on this page, I wrote this simple script to test a server for TLS 1.0, 1.1, and 1.2 support. If the SSL/TLS version is not supported, it looks like this instead. Enter: CMD Enter the commands below and validate their outputs. Environment Windows TLS (Transport Layer Security) Issue TLS 1.2 is not enabled and causes secure connection errors. New, TLSv1/SSLv3, Cipher is DHE-RSA-AES256-SHA Steps to validate that TLS 1.2 is enabled on your Windows workstation/server. If the SSL/TLS version is supported, openssl prints a section like this near the end of the output. Openssl s_client -connect localhost:25 -starttls smtp -tls1_2 < /dev/null For example, to test the local sendmail server to see whether it supports TLS 1.2, use the following command. To test such a service, use the -starttls option of s_client to tell it which application protocol to use. There is a man page for the subcommand ( man s_client) which lists its options.Ĭertain application protocols, such as FTP or SMTP, require that the client requests TLS support before a secure connection can be negotiated. They have the same names but preceded with 'no_' for example, -no_ssl2. There are also options to prevent the use of a particular protocol version (or versions) during negotiation. The -ssl2, -ssl3, -tls1, -tls1_1, and -tls1_2 options force s_client to use SSLv2, SSLv3, TLSv1.0, TLSv1.1, or TLS1.2. You can tell s_client which protocol to use or which not to use. This subcommand pretends to be a client program and shows you the results of its SSL/TLS negotiation with the server. To test whether or not a service on a particular port supports TLS 1.1 or 1.2 (or prevents the use of versions such as SSL 3), use the openssl command with the subcommand s_client.

How to test tls 1.2 connection