SSRS Report Server Could not establish connection. The underlying connection was closed. Could not establish trust relationship for the SSL/TLS Secure channel

Hi

Had to un-install and then re-install MS SQL Server 2012 with SSRS.

After we re-installed we are able to get to the Web Services page but not the Report Server page and get the above error message. We need to use SSL and when we bind the cert in RS Configuration Manager it says it does this successfully on the WebServices tab. We also do a similar exercise on the ReportServer page. 

Any help warmly welcomed :D

Thanks