Oracle Connection request timed out c#

Question

I am currently working on an application that does a few different things, but I've run into a problem where the application only works on mine and others development computers and not on a non development laptop and a Virtual PC running batch assignments

When I try to run the release files on the Batch PC and the Laptop I get the following error.

Exception took place in:  PR Get(OracleInternal.ConnectionPool.ConnectionString, Boolean, OracleInternal.ConnectionPool.CriteriaCtx, System.String, Boolean)
Data:  System.Collections.ListDictionaryInternal
H Result:  -2147467259
Message:  Connection request timed out
Stack Trace:     at OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString csWithDiffOrNewPwd, Boolean bGetForApp, CriteriaCtx criteriaCtx, String affinityInstanceName, Boolean bForceMatch)
at OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString csWithNewPassword, Boolean bGetForApp, CriteriaCtx criteriaCtx, String affinityInstanceName, Boolean bForceMatch)
at OracleInternal.ConnectionPool.OracleConnectionDispenser 3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword, CriteriaCtx criteriaCtx)
at Oracle.ManagedDataAccess.Client.OracleConnection.Open()
at BatchErrorScreenshotter.Program.DatabaseChecker.GetAllBatchesFromDB() in C:\Users\clm\documents\visual studio 2015\Projects\BatchErrorScreenshotter\BatchErrorScreenshotter\Program\DatabaseChecker.cs:line 25

The connection string used

<connectionStrings>
<add name="OracleConnectionXALP" providerName="Oracle.ManagedDataAccess.Client"
  connectionString="User Id=XXXXX;Password=XXXXX;Data Source=XALP;Min Pool Size=2; Connection Lifetime=30;Connection Timeout=10;Incr Pool Size=1;Decr Pool Size=1"/>

I have tried fiddling with it, changing the different values without much of a change in the results. I tried adding a Max Pool Size of 200, an increase from the default 100. But it did not work.

The following is the code where I make the connection to the database and it returns the data needed. (Line:25 is -> conn.Open() )

public DatabaseCheckWrapper GetAllBatchesFromDB()
    {
        try
        {
            using (var conn = new OracleConnection(ConfigurationManager.ConnectionStrings["OracleConnectionXALP"].ConnectionString))
            {
                conn.Open(); // Line 25, Connection error happens here
                DatabaseCheckWrapper dbw = new DatabaseCheckWrapper();
                OracleCommand cmd = new OracleCommand()
                {
                    CommandText = $"xal_supervisor.batchmonitor_pkg.get_batchmonitor",
                    CommandType = CommandType.StoredProcedure,
                    Connection = conn
                };

                OracleParameter p1 = new OracleParameter
                { OracleDbType = OracleDbType.RefCursor, ParameterName = "batchmonitor_ud", Direction = ParameterDirection.Output };

                cmd.Parameters.AddRange(new[] { p1 });

                var reader = cmd.ExecuteReader();

                var batches = new List<BatchDeadCheck>();
                while (reader.Read())
                {
                    var batch = new BatchDeadCheck();
                    batch.DXDEMINUTTER = reader.GetInt32(0);
                    batch.ACCEPTDXDEMINUTTER = reader.GetInt32(1);
                    // ACTION NAME IS ?Mainwindowtitle?
                    batch.ACTIONNAME = $"{reader.GetString(2)} (tilsluttet)";
                    batch.SESSIONSTATUS = reader.GetString(3);
                    batch.ADVERSELEMAIL = reader.GetString(4);
                    batch.ILIVETID = reader.GetInt32(5);
                    batches.Add(batch);
                }
                dbw.DisplayText = $"> Database batch check was run at {DateTime.Now.ToString("T")}";
                dbw.Batches = batches;
                conn.Close();
                return dbw;
            }
        }
        catch (Exception e)
        {
            DatabaseCheckWrapper dbwError = new DatabaseCheckWrapper();
            dbwError.DisplayText = $"!!Error has occurred while retrieving data from the Database!!";
            dbwError.Batches = null;
            dbwError.Exception = e;
            return dbwError;
        }
    }

So far I've checked every link on the first page on google, when googling the " c# Connection request timed out " And I've done some reading on the oracle connection pooling in Oracle® Data Provider for .NET without getting any real solutions

Update: I decided to try and ping the db server and found that my laptop couldn't reach it, but the batch PC could. So I'll be testing on the Batch PC now. I also got the following error log on my first run on the Batch PC

Data:  System.Collections.ListDictionaryInternal
Inner Exception:  OracleInternal.Network.NetworkException (0x00002F7A): ORA-12154: TNS:could not resolve the connect identifier specified
at OracleInternal.Network.AddressResolution..ctor(String TNSAlias, String instanceName)
at OracleInternal.Network.OracleCommunication.DoConnect(String tnsDescriptor)
at OracleInternal.Network.OracleCommunication.Connect(String tnsDescriptor, Boolean doNAHandshake, String IName)
at OracleInternal.ServiceObjects.OracleConnectionImpl.Connect(ConnectionString cs, Boolean bOpenEndUserSession, CriteriaCtx criteriaCtx, String instanceName)
Message:  ORA-12154: TNS:could not resolve the connect identifier specified
Stack Trace:     at OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString csWithDiffOrNewPwd, Boolean bGetForApp, CriteriaCtx criteriaCtx, String affinityInstanceName, Boolean bForceMatch)
at OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString csWithNewPassword, Boolean bGetForApp, CriteriaCtx criteriaCtx, String affinityInstanceName, Boolean bForceMatch)
at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword, CriteriaCtx criteriaCtx)
at Oracle.ManagedDataAccess.Client.OracleConnection.Open()
at BatchErrorScreenshotter.Program.DatabaseChecker.GetAllBatchesFromDB() in C:\Users\clm\documents\visual studio 2015\Projects\BatchErrorScreenshotter\BatchErrorScreenshotter\Program\DatabaseChecker.cs:line 25

Answer 1

Have you checked if an tnsnames.ora file is available on the machine where you get error ORA-12154: TNS:could not resolve the connect identifier specified

Check your system enviroment variables for "TNS_ADMIN", if not found then create it with reference to folder where tnsnames.ora should be placed. Then copy tnsnames.ora from your development pc.

Answer 2

Verified from able to reach the Oracle database host/port from the server where database agent is installed.

You can find more information about network requirements here.

https://docs.appdynamics.com/display/PRO44/Database+Visibility+System+Requirements#DatabaseVisibilit ...