Hi Prasad,
Please perform the following:
1. Login to the Portal system where you need to deploy the EAR file and then navigate to: User Administration->Identity Management.
2. Check if the user for which you are entering the password exists on Portal.
3. If user exists on Portal, then check the group assigned to the user. The user should have "Administrators" group.
4. Finally try to login to Portal using the above user and enter the password that you have been entering while trying to deploy. If the user is able to successfully login, then the deployment will be successful, if not, then you need to provide the Portal password of the user, while deploying from NWDS.
Do let me know in case the issue persists.
Best Regards,
Rohit