After I installed the Hyper-V Role onto my server I've receiving this error when trying to login with RDP, I have already tried changing Encryption Oracle Remediation to Vulnerable, it didn't fix the issue and I reverted it after discovering the security risks of it.
The only things I did before this issue became apparent was removing IIS & Installing Hyper-V.
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I went 1 by 1 through the Security Options (Policies) that I changed to improve security and found that one of the policies I was told to change to "Deny All" which was "Network security: Restrict NTLM: Incoming NTLM traffic" I changed it to "Allow all" and updated the group policies and I can now connect through RDP.
Hopefully this won't be a risk to my DC.
Excelente me sirvió esta solución fui derecho y corregí el problema, ahora tengo el riesgo del Trafico NTLM entrante
This can be mitigated with a registry entry. I've found the primary reason for this is systems that are not up2date with Windows updates.
There are known workarounds: https://docs.microsoft.com/en-us/troubleshoot/azure/virtual-machines/credssp-encryption-oracle-remediation
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