/usr/bin/gnutls-cli-debug

gnutls-cli-debug - GnuTLS debug client
Usage:  gnutls-cli-debug [ -<flag> [<val>] | --<name>[{=| }<val>] ]... [hostname]

None:

   -d, --debug=num            Enable debugging
				- it must be in the range:
				  0 to 9999
   -V, --verbose              More verbose output
   -p, --port=num             The port to connect to
				- it must be in the range:
				  0 to 65536
       --app-proto            an alias for the 'starttls-proto' option
       --starttls-proto=str   The application protocol to be used to obtain the server's certificate (https, ftp, smtp, imap, ldap, xmpp, lmtp, pop3, nntp, sieve, postgres)
       --attime=str           Perform validation at the timestamp instead of the system time

Version, usage and configuration options:

   -v, --version[=arg]        output version information and exit
   -h, --help                 display extended usage information and exit
   -!, --more-help            extended usage information passed thru pager

Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.
Operands and options may be intermixed.  They will be reordered.

TLS debug client. It sets up multiple TLS connections to
a server and queries its capabilities. It was created to assist in debugging
GnuTLS, but it might be useful to extract a TLS server's capabilities.
It connects to a TLS server, performs tests and print the server's
capabilities. If called with the `-V' parameter more checks will be performed.
Can be used to check for servers with special needs or bugs.

Please send bug reports to:  <bugs@gnutls.org>