TNS-12560: TNS: protocol adapter error TNS-00515: Connect failed because target host

[ramrk]

I have installed Oracle 11g on OracleEnterpris eLinux. I've logged in as sysdba, and I've given the command
"startup." I got a response that the database was open. after network configuration i gave
lsnrctl start In OS level." But I got a message that the listener failed to start.
The error messages were:

TNS-12545: Connect failed because target host or object does not exist.
TNS-12560: TNS: protocol adapter error
TNS-00515: Connect failed because target host or object does not exist.
How to solve above errors .plz send answers

[ramrk]

TNS-12560: TNS: protocol adapter error
TNS-00515: Connect failed because target host or object does not exist
how to solve above errors

[amitpatel66]

[code=oracle]
ORA-12545: Connect failed because target host or object does not exist

Cause: The address specified is not valid,
or the program being connected to does not exist.

Action: Ensure the ADDRESS parameters have been entered correctly;
the most likely incorrect parameter is the node name. E
nsure that the executable for the server exists (perhaps "oracle" is missing.)
If the protocol is TCP/IP, edit the TNSNAMES.ORA file to change the host name to a numeric IP address and try again.
[/code]