In one of the windows system service desk plus is running with service account called "sdpservice".

I have discovered all resource account and service account from domain.

Now if I am trying to change password for one of the service account "sdpservice" I am not able to change password.

I have followed below link as well,

https://www.manageengine.com/products/passwordmanagerpro/help/windows_service_account_reset.html

Please check attached snap shots for configuration.

Note: Agent less scenario 

Thanks 

Arjun