Oracle Error Message
ORA-12545: Connect failed because target host or object does not exist
Reason for the Error
The address specified is not valid, or the program being connected to does not exist.
Solution
Ensure the ADDRESS parameters have been entered correctly; the most likely incorrect parameter is the node name. Ensure 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.