Windows Admin Center is a locally deployed, browser-based app for managing Windows servers, clusters, hyper-converged infrastructure, as well as Windows 10 PCs. It is a free product and is ready to use in production.
When prompted with an error when trying to access WAC from other browsers saying the site is not secure.
– Root cause: A self-signed certificated option was selected during the first installation
Solution: Uninstall WAC, and on the WAC Installation page - Select the second option and - specify the thumbprint and click on install.
And click on Install. This should fix the issue. Other Possible problems – http://bit.ly/2tqsNGp
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.