ORA-28547: 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=)