oerr ora 28547
28547, 0000, "connection to server failed, probable Oracle Net admin error"
// *Cause:   A failure occurred during initialization of a network connection
//           from a client process to the Oracle server:  The connection
//           was completed but a disconnect occurred while trying to
//           perform protocol-specific initialization, usually due to
//           use of different network protocols by opposite sides
//           of the connection.  This usually is caused by incorrect
//           Oracle Net administrative setup for database links or external
//           procedure calls.   The most frequent specific causes are:
//           --  The connection uses a connect string which refers
//               to a Heterogeneous Services agent instead of
//               an Oracle server.
//           --  The connection uses a connect string which includes
//               an (HS=) specification.
// *Action:  Check Oracle Net administration in the following ways:
//           --  When using TNSNAMES.ORA or an Oracle Names server, make sure
//               that the client connection to the ORACLE server uses
//               the correct service name or SID.
//           --  Check LISTENER.ORA on the connection end point's host machine
//               to assure that this service name or SID refers
//               to the correct server.
//           --  Confirm in TNSNAMES.ORA or the equivalent service definition
//               that the connect string does NOT contain (HS=).
//