I have no idea. I tried myself with IE11 on Windows 7, but it all works fine. Perhaps Fiddler
[www.telerik.com] can shed some light on this issue? Can you make an exact copy of the HTTP request that IE11 sends? Perhaps I can use it to reproduce your issue.
About ECDH and RSA, those are different ciphers for different usage. ECDH is for key exchange and RSA is for signing. I don't know what you mean with 'summary' and 'details', but I don't think this all is related to the cause of your issue.