Ldap security provider leads in 401 errors in WL 12.1.3

Question

I'm facing a migration from 10.3.2 to 12.1.3. The configuration is almost the same (I'll bet that config.xml is more or lest the same from previos version).
In my environment, the user's authentication and authorization is made using an external (not embeded) ldap. Needles to say that everything works perfect in 10.3.2, but in the new version the behaviour is weird:
* First time a user tryes to enter in the system the application returns a 401 error.
* Next attempt the user can enter into the system without problem.
* If the user continues using the system, there are no problems.
* If the user doesn't re-connect to the system after some time 401 error is returned again.
I find out that if I disable the ldap cache everything works fine. But in a production enviroment I believe cache is a must.
Does anyone have faced this issue?

Answer 1

Verified WebLogic Classloading using CAT '( wls-cat  app ) and found oracle.dms.console.DMSConsole was loaded from web-inf jar and ucp classes were loaded from jar from weblogic, used below entry in weblogic.xml to load everything from web-inf  to resolve the issue
  <container-descriptor>
      <prefer-web-inf-classes>true</prefer-web-inf-classes>
   </container-descriptor>
Thanks
Sandeep