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Check the listener service if it is running, try pinging the listener or check the listener status using lsnrctl,<br />
Also check for open ports 1521 by using &quot;netstat&quot; or &quot;nmap&quot; commands
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Check the listener service if it is running, try pinging the listener or check the listener status using lsnrctl,
Also check for open ports 1521 by using "netstat" or "nmap" commands

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It's also possible the database is down so it hasn't self-registered to the listener, or the database has the local listener parameter set to a listener other than the one you're connecting to.<br />
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ask your dba to check the server<br />
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This asssumes the database was up previously while using sql developer but has gone down since then while using the .net app
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It's also possible the database is down so it hasn't self-registered to the listener, or the database has the local listener parameter set to a listener other than the one you're connecting to.

ask your dba to check the server

This asssumes the database was up previously while using sql developer but has gone down since then while using the .net app

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Hoping someone can explain what this error means and how to resolve. &nbsp;Have a windows C# application that is trying to connect to a Oracle database. &nbsp;Can connect fine through SQL Developer. &nbsp;<br />
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Oracle Connection Error - ORA-12514: TNSlistener does nto currently know of service requestedon connect description
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Hoping someone can explain what this error means and how to resolve.  Have a windows C# application that is trying to connect to a Oracle database.  Can connect fine through SQL Developer.  

Oracle Connection Error - ORA-12514: TNSlistener does nto currently know of service requestedon connect description

Oracle Connection Error - ORA-12514: TNSlistener does nto currently know of service requestedon connect description

Oracle is an object-relational database management system. It supports a large number of languages and application development frameworks. Its primary languages are SQL, PL/SQL and Java, but it also includes support for C and C++. Oracle also has its own enterprise modules and application server software.

Oracle Database

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).