Restore-SPSite : The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (application/soap+msbin1). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly

Issue Description

I had recently come across this error while trying to restore a SharePoint 2010 site.

Restore-SPSite : The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (application/soap+msbin1). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly

Cause

This could be because there is some error on your web.config files.

Resolution

Check the below web.config files 

1) Central administration

2) Specific SharePoint Web application

3) Security Token Service

1) Make sure that there are no spaces in the web.config file

2) There should not be duplicate nodes

3) Make sure all nodes are entered properly in the web.config files (especially when you are working with forms based configuration).