Certificate from a CA that is not trusted causes error.
"The security certificate was issued by a company you have not chosen to trust. View the certificate to determine whether you want to trust the certifying authority."
You will need to install the certificate for WebWatchBot's service (WWBServer) Windows user account which access that URL (or obtain a certificate from a trusted CA)
If you are running WebWatchBot as a Windows Service, you will need to log in under the account that is running the service (Control Panel -> Administrative Tools -> Services, service name "WWBServer") and install the certificate. Instructions for Installing a Client Certificate.
If the Windows user account for WebWatchBot's service (WWBServer) is "Local SYSTEM account", you must change it to an account that has Administrative privilege, and then log in and install the certificate.