Cannot Login to Remote Desktop With Correct Credentials

You are using Microsoft RDP and trying to connect to a remote machine. You enter the correct credentials but you cannot login. The message that you get is that the credentials are incorrect. While there could a litany of reasons why this is happening, but one more think you could check is the registry entry for the attribute LmCompatibility level at this location HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel. Try setting it to 5 which essentially sets NTLMv2 to security level 5. Retest your issue and it might just work.