"The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel" Office WebApp Error

Problem: 
Can't open any document in WCA and the WCA ULS is generating the following issue:

WOPI CheckFile: Catch-All Failure [exception:Microsoft.Office.Web.Common.EnvironmentAdapters.UnexpectedErrorException: HttpRequest failed ---> Microsoft.Office.Web.Apps.Common.HttpRequestAsyncException: No Response in WebException ---> System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.  

Initial Hypothesis: 
On each specific WCA server, I try open the SharePoint web Application i.e. https://www.demo.dev, the browser displays that the certificate has errors "Certificate error".  Opening up the certificate and the certificate chain looks correct.

Resolution:
1. Run -> MMC -> File -> Add snap-ins -> Certificates -> Add -> Computer Account -> Local Computer -> Finish. OK.
2. In the MMC console navigate to Certificates -> Trusted Root Certificate Authorities -> Certificates -> (Right click) All Tasks -> Import (both the Trust root and the intermidiary certificates required.


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