How to disable RC4 ciphers
https://docs.microsoft.com/en-us/windows-server/identity/ad-fs/operations/manage-ssl-protocols-in-ad-fs https://samrueby.com/2015/06/08/how-to-disable-sslv3-and-rc4-ciphers-in-iis/ https://msrc-blog.microsoft.com/2013/11/12/security-advisory-2868725-recommendation-to-disable-rc4/ https://support.microsoft.com/en-us/kb/245030 http://windowsitpro.com/windows/disabling-rc4-cipher Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers] [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 128/128] "Enabled"=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 40/128] "Enabled"=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 56/128] "Enabled"=dword:00000000