Oracle connection ok but ORA-12170: TNS:Connect timeout occurred when executing queries

Question

I have some errors executing queries against a oracle 11g database from a .net c# console application. The connection seems to be established properly (the conn.State property is Open after the following lines)

OracleConnection conn = new OracleConnection(connString);
conn.Open();

but when launching any query I get an ORA-12170 error (Connect timeout ocurred). I don't think the problem is in the code as the same test against another database works properly.

Connection.State is Open

Error: ORA-12170: TNS:Connect timeout occurred
   at Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure, Boolean bCheck)
   at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, Object src)
   at Oracle.DataAccess.Client.OracleConnection.Open()
   at Proj1.DB.OracleProj1.GetOpenConn(String connString) in C:\WorkTV\src\projects\OracleProj1\source\Core\Proj1Core\DB\OracleProj1.cs:line 560
   at Proj1.DB.OracleProj1.AddLog(DateTime start, DateTime end, Int32 userID, String ip, Int32 assetID, Int32 segmentID, Int32 flowID, Int32 permissionID, Int32 permissionSubtype, Int32 resultCode, String resultDescription, String resultLog) in C:\WorkTV\src\projects\OracleProj1\source\Core\Proj1Core\DB\OracleProj1.cs:line 3513
   at Proj1.Util.Tool.AddLog(Int32 resultCode, String resultDescription, String resultLog) in C:\WorkTV\src\projects\OracleProj1\source\Core\Proj1Core\Util\Tool.cs:line 177
   at Proj1.DB.OracleProj1.ExecuteNonQuery(OracleConnection conn, String query, String& log, Proj1Object Proj1Object) in C:\WorkTV\src\projects\OracleProj1\source\Core\Proj1Core\DB\OracleProj1.cs:line 638
   at Proj1.DB.OracleProj1.TestConnection(String connString) in C:\WorkTV\src\projects\OracleProj1\source\Core\Proj1Core\DB\OracleProj1.cs:line 315

Connection.State is Closed

I can connect to this database through Oracle SQL Developer, with the same user, and insert/delete rows successfully.

When trying to connect with sqlplus throught command line I get an ORA-12560: TNS:protocol adapter error, so I cannot make any test.

All the oracle services are running.

Command Lsnrctl status says:

Instance "xxx", status READY, has 1 handler(s) for this service...

Any help related to any of both errors will be appreciated.

Answer 1

You should try checking your ODP Libraries. This worked for me, my inner exception was about incompatibility between Oracle.DataAccess and Oracle 11g Database.

Check this link out and this answer.