This could be due to CredSSP encryption oracle remediation fix

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When you try to connect to a remote Windows server using Remote Desktop Connection Client after May 8, 2018 you get this error: CredSSP encryption oracle remediation error window

  1. Navigate to policy path: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation and double click setting name: Encryption Oracle Remediation

  2. Enable it and set Protection Level to Vulnerable. Click OK

Source: Fix for “This could be due to CredSSP encryption oracle remediation” – Sebastian.Expert

Ran into this issue last week, this local GPO setting on my machine allowed me to RDP into the server.