https://support.microsoft.com/en-us/help/4093492/credssp-updates-for-cve-2018-0886-march-13-2018 article mentions that may patches change the default setting from Vulnerable to Mitigated.
We patched some of our servers and did not notice any RDP issues when we tried to connect from unpatched server to patched server?
We also did not find registry value on the patched server? how does may patch change the default setting from Vulnerable to Mitigated?