Change cipher suite(TLS_ECDHE_ECDSA_with_AES_256_GCM_SHA384)

1.From a command line, run gpedit.msc to start the Local Group Policy Editor,

 

2.A window will pop up with the Local Group Policy Editor. On the left pane, click Computer Configuration >> Administrative Templates >> Network >> SSL Configuration Settings.

 

3.On the right pane, double click SSL Cipher Suite Order to edit the accepted ciphers. Note that the editor will only accept up to 1023 bytes of text in the cipher string – any additional text will be disregarded without warning.

 

4.Save your changes when you are finished and then restart the server to have them take effect. Don’t forget that changing your cipher suite configuration may cause older browsers to fail on your website because if are not able to use the updated stronger protocols.