Hi Mandar,
Could you confirm on how you were able to come to this error message? Were you login to the application and you see this error message? OR are you using web services methods to login to the application?
Also let us know the patch level at which you are currently. If this is on a test system, then you can use to turn on:
pdm_logstat -a verbose
and to turn off:
pdm_logstat -a
Don't do this on a production system, as it writes everything and more targeted logging is needed.
We need more log data to understand the situation on this.