These two monitors (Program or Script monitors, compatible with all license types, including freeware) allow to perform two simple checks:
1. Whether SSL certificate is valid (i.e., uses correct domain name, well-known CA, isn't expired etc) 2. How much time (in seconds) left before certificate expires
Prerequisites: Install Cygwin and make sure openssl package is installed as well.
Notice: It is assumed that you install Cygwin 64-bit version into its default folder (C:\Cygwin64). if you install 32-bit version and/or choose custom installation folder, please change path to program in both monitors' "Main parameters" accordingly.