Hi Sathish,
Have you check your user "wasadmin" in your custom registry (CR)?
Can you login with other users?
Your CR is validating correctly? that is, if you login with "wasadmin" can you check that wasadmin is what your CR is validating? what happen if you login with wasadmi instead of wasadmin?
You can enable traces to see better what is happening:
In the administrative console, navigate to TroubleShooting > Logs and Trace > server_name.
Select Diagnostic Trace Service. Set the Maximum Number of Historical Files to 20.
Click Apply, then click on runtime tab and select Change Log Detail Levels.
Clear the trace specification in the box and replace it with the following trace specification:
*=info:com.ibm.ws.security.*=all:com.ibm.websphere.security.*=all:com.ibm.websphere.wim.*=all:com.ibm.wsspi.wim.*=all:com.ibm.ws.wim.*=all
reproduce the problem and disable traces again.
Hope this helps. Tell us if you need more support
regards