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--- security:openssl [2021/09/14 14:34] – created gerardorourke
+++ security:openssl [2026/08/13 11:37] (current) – [Retrieve the Certificate for a specific FQDN / TCP Port] gerardorourke
@@ Line 1: / Line 1: @@
-====== Open SSL ======
+====== Open SSL TIPS ======
+===== Check TLS Version supported by a Server =====
+<code>
+openssl s_client -connect www.google.com:443 -tls1_3
+openssl s_client -connect www.google.com:443 -tls1_2
+openssl s_client -connect www.google.com:443 -tls1_1
+openssl s_client -connect www.google.com:443 -tls1
+</code>
+===== Retrieve the Certificate for a specific FQDN / TCP Port=====
+<code>openssl s_client -connect <hostname>:<port> -showcerts</code>
+<code>openssl s_client -connect sse9.public.wamswxc-p-2.prod.infra.webex.com:8934 -showcerts</code>
+===== SSL Commands=====
 **openssl** command to view the "purpose" of a certificate
+<code>openssl x509 -in <certificate-file> -text -noout -purpose</code>
+Reference: https://www.sslshopper.com/article-most-common-openssl-commands.html
 <code>