The NULL cipher does not provide data confidentiality or integrity. It is recommended that the NULL cipher be disabled. Rationale: By disabling the NULL cipher, there is a better chance of maintaining data confidentiality and integrity.
Solution
Perform the following to disable NULL cipher: Set the following key to 0. HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\NULL:Enabled To disable using PowerShell enter the following command: New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\NULL' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\NULL' -name 'Enabled' -value '0' -PropertyType 'DWord' -Force | Out-Null