Error ORA-1153 using Oracle.ManagedDataAccess.DLL to connect

We switched from using Oracle.DataAccess.DLL to Oracle.ManagedDataAccess.DLL in our .Net App.  The code change took minutes, but all the connection string  changes took me a few hours to resolve.  The last error I kept receiving when I tried to connect to Oracle was ORA-1153.  Specifically I had the following values in the exception:

• HResult: -2147467259
• Message: Oracle error ORA-1153 encountered
• Source : Oracle Data Provider for .NET, Managed Driver

This error occurred when the code tried to open the connection

• _cnOra.Open();

The error occurred because I was missing the CONNECT_DATA value from the descriptor in my datasource of my application .config file.  I had this value:

<dataSource alias=”dev” descriptor=”(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=myServerName)(PORT=1521)) )”/>

when I should have had this value:

<dataSource alias=”dev” descriptor=”(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=myServerName)(PORT=1521)) (CONNECT_DATA = (SERVICE_NAME = dev)))”/>