Oracle 11g: instantclient problems. I can not connect to server.

# Oracle 11g Server (Tower)
# ORACLE_HOME/network/admin/listener.ora
 
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = DEMO11)
      (ORACLE_HOME = /opt/oracle/product/11.1.0/db_1)
    )
    (SID_DESC =
      (SID_NAME = donna)
      (ORACLE_HOME = /opt/oracle/product/11.1.0/db_1)
    )
  )
 
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
    )
  )
 
 
# sqlnet.ora Network Configuration File: ORACLE_HOME/network/admin/sqlnet.ora
 
# The domain from which clients requests names
names.default_domain = 192.168.0.71
 
# Determine number of connections a client may have open
names.max_open_connections = 60
 
# Specify a list of Onames servers in the client region
names.preferred_servers = (address_list =
  (address=(protocol=ipc)(key=n23))
  (address=(protocol=tcp)(host=192.168.0.77)(port=1521))
  (address=(protocol=tcp)(host=192.168.0.77)(port=4040))
)
 
# Order for naming adaptors
names.directory_path = (TNSNAMES,HOSTNAME)
 
# TODO: pending note
sqlnet.authentication_services = (ALL)
names.authority_required = FALSE
 
 
# SQL*NET will bypass the network layer and make direct local
# connections to the database. This is useful on db servers
automatic_ipc = ON
 
# ORACLE_HOME/network/admin/tnsnames.ora
 
DEMO11 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DEMO11)
    )
  )
 
DONNA =
(DESCRIPTION =
  (ADDRESS_LIST =
    (ADDRESS=
    (PROTOCOL=TCP)
    (HOST=localhost.localdomain)
    (PORT=1521)
    )
  )
  (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = donna)
    )
  )
 
 
GENESYS =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS=
        (PROTOCOL=TCP)
        (HOST=192.168.0.77)
        (PORT=4040)
      )
    )
    (CONNECT_DATA =
      (SERVICE_NAME=genesys)
    )
)
 
DONNA_LOCAL =
(DESCRIPTION=
  (ADDRESS=
    (PROTOCOL=TCP)(HOST=localhost.localdomain)(PORT=1521)
  )
)
 
GENESYS_REMOTE =
(DESCRIPTION =
  (ADDRESS=
    (PROTOCOL=TCP)(HOST=192.168.0.77)(PORT=4040)
  )
)

                                  

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