Oracle.ManagedDataAccess.Client.OracleException (0x80004005): ORA-12520: TNS:listener could not find available handler for requested type of server ---> OracleInternal.Network.NetworkException (0x000030E8): ORA-12520: TNS:listener could not find available handler for requested type of server at OracleInternal.Network.OracleCommunication.DoConnect(String tnsDescriptor) at OracleInternal.ServiceObjects.OracleConnectionImpl.Connect(ConnectionString cs, Boolean bOpenEndUserSession, String instanceName) at OracleInternal.ConnectionPool.PoolManager`3.Get(ConnectionString csWithDiffOrNewPwd, Boolean bGetForApp, String affinityInstanceName, Boolean bForceMatch) at OracleInternal.ConnectionPool.OraclePoolManager.Get(ConnectionString csWithNewPassword, Boolean bGetForApp, String affinityInstanceName, Boolean bForceMatch) at OracleInternal.ConnectionPool.OracleConnectionDispenser`3.Get(ConnectionString cs, PM conPM, ConnectionString pmCS, SecureString securedPassword, SecureString securedProxyPassword) at Oracle.ManagedDataAccess.Client.OracleConnection.Open() at PPCInternet.Dbaccess.getConnection() in C:\Code\PPCInternet\PPCInternet\Classes\Dbaccess.vb:line 12