Usually, in non-production environments, it is necessary to check applications deployed on a Weblogic server. The default log (.out) does not report or details conclusively the real cause of the problem.
In this case, beyond the levels of logs that can be configured via weblogic console (Managed Server > Logging > Advanced), we can add to the JVM startup arguments (Managed Server > Configuration > Server Start > Arguments) the following arguments:
-Dweblogic.webservice.verbose=true -Dweblogic.wsee.verbose=* -Dweblogic.wsee.verbose=weblogic.wsee.* -Dweblogic.wsee.verbose.timestamp=true
Recommended use only during the troubleshoot, because it generates a lot of logs.