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Error Ora-12545 Connect Failed

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the node specified. For example: when the listener has not been started on the node, if the node address has been specified incorrectly, ora 12545 connect failed toad or a firewall blocks access. How to fix it[edit] This message occurs

Ora 12545 Connect Failed Because Target Host Does Not Exist

when the listener on the remote node cannot be contacted. Did you add the host name and IP in

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your DNS server? You can try tracing the path or the route a connection is taking from the client to the server. If it encounters an error, then it returns

Ora-12454: Connect Failed Because Target Host Or Object Does Not Exist

the error stack which gives us more information when compared to an cryptic one line error. Execute the following: trcroute host_name This will help you find the problem and fix it. The problem may fall into one of the following areas: Check TNSNAMES.ORA: The TNSNAMES.ORA may contain a wrong address. Check the host and port have been specified correctly. Check ora-12545 network transport the details against the LISTENER.ORA file. Check the remote node: Check if the listener has been started on the remote node. Check the status with the STATUS command of the listener control utility (lsnrctl): lsnrctl lsnrctl> status listener_name listener_name is the name of the listener defined in the listener.ora file. If you have not changed the listener name, then it would be called LISTENER. If the listener has not been started, start it with the command: lsnrctl> start listener_name You can check if the fix worked by executing tnsping. It should return an "OK" message if the TNSPING has been successful. Retrieved from "http://www.orafaq.com/wiki/index.php?title=ORA-12545&oldid=9517" Category: Errors Navigation menu Views Page Discussion Edit History Personal tools Log in / create account Site Navigation Wiki Home Forum Home Blogger Home Site highlights Blog Aggregator FAQ's Mailing Lists Usenet News RSS Feeds Wiki Navigation Categories Recent changes Random page Help Search Tools What links here Related changes Special pages Printable version Permanent link Page information This page was last modified on 23 June 2008, at 10:33. Privacy policy About Oracle Wiki Disclaimers

here for a quick overview of the site Help Center Detailed answers to any questions you ora-12545 connect failed because target host or object does not exist (dbd error ociserverattach) might have Meta Discuss the workings and policies of this site ora-12545 toad About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or error while trying to retrieve text for error ora-12545 posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of http://www.orafaq.com/wiki/ORA-12545 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up ORA-12545: Connect failed because target host or object does not exist - No error on System.Data.OracleClient up vote 6 down vote favorite 1 Can't believe I am having to ask this question, but I cannot for the http://stackoverflow.com/questions/18252635/ora-12545-connect-failed-because-target-host-or-object-does-not-exist-no-erro life of me connect to an Oracle 11g database. The following works while using System.Data.OracleClient - but obviously this is depreciated. When using the exact same code but using Oracle.DataAccess.OracleClient I get the following error {"ORA-12545: Connect failed because target host or object does not exist"} Here is my code using (OracleConnection con = new OracleConnection("Data Source=orac;User Id=SYSTEM; Password=Pass;")) { con.Open(); Console.WriteLine("Connection opened"); OracleCommand cmd2 = new OracleCommand("SELECT * FROM SYSTEM.TABLE", con); OracleDataReader oracleDataReader = cmd2.ExecuteReader(); while (oracleDataReader.Read()) { Console.WriteLine(oracleDataReader[0]); } } Could anyone help me out with what I am doing wrong? I had to change the program to be 32 bit for the Oracle.DataAccess.dll to load. Is this even the correct library to be using??? Thanks EDIT tnsnames.ora file as follows: # tnsnames.ora Network Configuration File: C:\app\UserName\product\11.2.0\dbhome_3\network\admin\tnsnames.ora # Generated by Oracle configuration tools. ORAC = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1522)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orac.example.com) ) ) LISTENER_ORAC = (ADD

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