Today’s “useful tool of the day” comes to us thanks to the openssl command line tool from openssl. It was probably well known to all, but I just found out about it today.

From the openssl man page:

       s_client  This implements a generic SSL/TLS client which can establish
                 a transparent connection to a remote server speaking SSL/TLS.
                 It's intended for testing purposes only and provides only
                 rudimentary interface functionality but internally uses
                 mostly all functionality of the OpenSSL ssl library.

Here’s an example:
Continue reading openssl as a debugging client →