Windows: "The system cannot log you on due to the following error: Access is denied."
Sudden:
The system cannot log you on due to the following error: Access is denied.
Please try again or consult your system administrator.
Finally, identified that because of:
1. The computer is Fixed IP.
2. Active Domain Controllers Changed.
So, got it as:
Incorrect DNS settings
References
The system cannot log you on due to the following error: The RPC server is unavailable
Update