May 13th, 2013· This version adds XMPP and timeout support.
March 2nd, 2013· A minor fix for TLS sites with multiple names.
December 8th, 2012· This version fixes a bug causing -N to always compare the CN with 'localhost'.
September 20th, 2012· This version improves the "no certificate returned" error message.
July 19th, 2012· This version adds the validity in days to the status line.
July 13th, 2012· A bug that caused performance data computations to fail on some systems was fixed.
July 7th, 2012· The status now includes performance data in days until expiration (requires Perl with Date::Parse).
· It is now possible to print additional information in the plugin's long output (multi-line, Nagios 3 only).
April 5th, 2012· This version removes a hard-coded reference to an openssl error number (this caused a problem with handling self-signed certificates).
September 2nd, 2011· It is now possible to authenticate using client certificates.
March 15th, 2011· The -N check was fixed for certificates with wildcards.
· HTTP can now be specified as a protocol (-P).
January 24th, 2011· The --openssl option was added to specify the path of the openssl executable to be used.
December 16th, 2010· Bugs with environment bleeding and shell globbing were fixed.
December 9th, 2010· This version added support for the TLS servername extension in ClientHello.
October 29th, 2010· Fixed a bug in the signal specification.
October 28th, 2010· Better trap handling and temporary file cleanup.
October 14th, 2010· The order of the checks was changed so that certificate chain validation is performed at the end.
September 15th, 2010· Fixed a bug in the command-line argument processing.
July 22nd, 2010· This version allows you to specify where to download temporary files.
July 11th, 2010· The plugin now accepts long command line options and differentiates between critical and warning status (for the validity period).
July 7th, 2010· Added the -f option to check local files.
July 1st, 2010· Fixed the plugin output (information text).
June 8th, 2010· Added new command-line option to allow self-signed certificates.