RemoteOperationException: ERROR: Invalid username and/or password

If you want to do Operating System related work with Oracle Enterprise Manager (EM)
Especially in window environment, you must need Host credentials(username and password of the server not client).
When you enter username and password then it return the following message:-

“RemoteOperationException: ERROR: Invalid username and/or password”

Solution:-

For this, the OS user must be in “log on as a batch job” and “log on as a service” in the local security police of the server.

To do this :-
Go to "Control Panel" -> "Administrative Tools" -> "Local Security Policy."
Within "Local Policies", go to user "Right Assignment."
Add the user to "Log on as a Batch Job." And "Log on as a service".

Diagnosing source....
===========================
ORACLE_HOME\hostname_sid\log directory message