The main cause of this issue is the devices security protocols conflicting with the course. If you have an IT department, we strongly recommend that they put the course into a 'whitelist' as this will ensure that the course is unhindered by security.
If you have accessed the course as a private individual, please mark the website as safe. If you are unable to do this, please try using a different browser or device to complete the training.
If you encounter further problems, please do contact us at: email@example.com