3 Replies Latest reply on May 3, 2016 6:18 PM by Kris Rice-Oracle

    503 Service unavailable errors




      I have a 12c DB running on Linux and a separate machine running Tomcat with ORDS 3.0.4 on Linux as well service several APEX apps.


      Everything worked fine until yesterday when the load increased to several hundreds of users with demanding needs


      So I started getting the message:


      Oracle Rest Data Services

      503 Service Unavailable


      The connection pool named: apex  is not correctly configured, due to the following error(s): Exception occured while getting connection: oracle.ucp.universalconnectionPoolException: Cannot get connection from Datasource: java.sql.SQLException: Listener refused the connection with the following error: ORA-12516, TNS listener could not find available handler with matching protocl stack



      It looks like a configuration issue that is set probably to defaults

      Any idea where the connection max limit configurations may be?