connection to server failed, probable Oracle Net admin error

 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. -- Hitting Ctrl
+C before connection initialization is complete. -- Using DRCP on Windows with
SQLNET.AUTHENTICATION_SERVICES set to NTS. -- Connection timeout due to
SQLNET.INBOUND_CONNECT_TIMEOUT parameter when all shared servers are
busy in shared server configuration.
ORA-24280 to ORA-28709 72-183

 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. -- Hitting Ctrl
+C before connection initialization is complete. -- Using DRCP on Windows with
SQLNET.AUTHENTICATION_SERVICES set to NTS. -- Connection timeout due to
SQLNET.INBOUND_CONNECT_TIMEOUT parameter when all shared servers are
busy in shared server configuration.
ORA-24280 to ORA-28709 72-183