"openssl s_client -connect %h:%p -no_ssl2")
"List of strings containing commands to start TLS stream to a host.
Each entry in the list is tried until a connection is successful.
-%s is replaced with server hostname, %p with port to connect to.
+%h is replaced with server hostname, %p with port to connect to.
The program should read input on stdin and write output to
stdout. Also see `tls-success' for what the program should output
after successful negotiation."