Authentication for user weblogic denied

I am unable to start node managerd server from command prompt.

I installed WebLogic Server Version: 12.1.2.0.0 on Windows 2008 R2 EN Sp1

I started Administration Server succesfully.

C:\Weblogic\Oracle\config\domains\wl_server\bin\startWebLogic.cmd

I created ihale Managed server but  I couldn't start Managed Server.

C:\Weblogic\Oracle\config\domains\wl_server\bin

startManagedWebLogic.cmd ihale http://192.168.1.29:7431

I'm getting following error.

 ####<Dec 25, 2013 12:51:13 AM PST> <Critical> <WebLogicServer> <umman> <ihale> <main> <<WLS Kernel>> <> <> <1387961473813> <BEA-000386> <Server subsystem failed. Reason: weblogic.security.SecurityInitializationException: Authentication for user weblogic denied.

weblogic.security.SecurityInitializationException: Authentication for user weblogic denied.

I am able to login administration console same username and password. Username: weblogic Password:xxxxx