Error while Federating a Node to Dmgr

ADMU0014I: Adding node washost01Node04 configuration to cell: washost01Cell01
ADMU0027E: An error occurred during federation washost01; rolling back to
           original configuration.
ADMU0211I: Error details may be seen in the file: C:\Program
           Files\IBM\WebSphere\AppServer\profiles\AppSrv01\logs\addNode.log
ADMU0026I: An error occurred during federation; rolling back to original
           configuration.
ADMU0113E: Program exiting with error:
           com.ibm.websphere.management.exception.AdminException:
           com.ibm.websphere.management.filetransfer.client.TransferFailedException:
           Upload retry limit exceeded for file
           C:\DOCUME~1\Admin\LOCALS~1\Temp\washost01Node04__30719.car. Exception:
           java.net.UnknownHostException: washost01, resulting from:
           java.net.UnknownHostException: washost01
________________________________________________________________________________

Solution:

** provide hostname of dmgr instead of ip address with addnode command.
** also you need to make an entry in the host file :
==============================
 C:\WINDOWS\system32\drivers\etc\hosts
192.168.1.25    washost01
==============================

>addnode washost01 8879