I\'ve just pulled down the latest Swagger from the Git repo (3.0.19) using: https://github.com/swagger-api/swagger-ui.git and updated my API to use the new version.
It's because some times your IIS Binding's HTTPS SSL Certificate will automatically goes to Not Selected. So again you have to manually select the SSL Certificates to1 IIS Express Development Certificate1. Below I have mention how to do:
SSL Certificate
= Not Selected
select IIS Express Development Certificate.Issue will be solved.