If you’ve had trouble logging in to remote Windows servers using Remote Desktop Protocol (RDP) recently, you are not alone.

Microsoft fixed a remote code execution vulnerability in CredSSP in the March updates for Windows. The Credential Security Support Provider protocol (CredSSP) is a Security Support Provider that lets applications delegate user’s NTLM or Kerberos credentials from clients to servers for remote authentication over an encrypted Transport Layer Security (TLS) channel.