excel upload fails after deploying to aws elastic beanstalk

Question

I have an MVC application which allows an admin user to upload an excel file onto the system; the controller then creates a dataset with the excel data and then populates a "Schools" & a "School2" database with the dataset using an SqlBulkCopy.

These uploads work perfect when I test them locally using IIS Express, although the same version deployed to aws elastic beanstalk throws an error when I press the import button. The error in the console shows as: Failed to load resource: the server responded with a status of 500 (Internal Server Error)

Could anybody see any clear reasons why this action works fine locally but does not work when deployed to elastic beanstalk?

My UploadController:

    public class UploadController : Controller
    {
        SqlConnection con = new SqlConnection(@"Data Source=bookingdb.cwln7mwjvxdd.eu-west-1.rds.amazonaws.com,1433;Initial Catalog=modeldb;User ID=USER;Password=PASSWORD;Database=modeldb;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False");

        OleDbConnection Econ;

        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
        public ActionResult Index(HttpPostedFileBase file)
        {
            string filename = Guid.NewGuid() + Path.GetExtension(file.FileName);
            string filepath = "/excelfolder/" + filename;
            file.SaveAs(Path.Combine(Server.MapPath("/excelfolder"), filename));
            InsertExceldata(filepath, filename);
            return View();
        }

        [HttpPost]
        public ActionResult Index2(HttpPostedFileBase file)
        {
            string filename = Guid.NewGuid() + Path.GetExtension(file.FileName);
            string filepath = "/excelfolder/" + filename;
            file.SaveAs(Path.Combine(Server.MapPath("/excelfolder"), filename));
            InsertExceldata2(filepath, filename);
            return RedirectToAction("Index");
        }

        private void ExcelConn(string filepath)
        {
            string constr = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES;""", filepath);
            Econ = new OleDbConnection(constr);
        }

        private void InsertExceldata(string filepath, string filename)
        {
            string fullpath = Server.MapPath("/excelfolder/") + filename;
            ExcelConn(fullpath);
            string query = string.Format("Select * from [{0}]", "Sheet1$");
            OleDbCommand Ecom = new OleDbCommand(query, Econ);
            Econ.Open();

            DataSet ds = new DataSet();
            OleDbDataAdapter oda = new OleDbDataAdapter(query, Econ);
            Econ.Close();
            oda.Fill(ds);

            DataTable dt = ds.Tables[0];

            SqlBulkCopy objbulk = new SqlBulkCopy(con);
            objbulk.DestinationTableName = "dbo.Schools";
            objbulk.ColumnMappings.Add("AcademicYear", "AcademicYear");
            objbulk.ColumnMappings.Add("RollNumber", "RollNumber");
            objbulk.ColumnMappings.Add("OfficialSchoolName", "OfficialSchoolName");
            objbulk.ColumnMappings.Add("Address1", "Address1");
            objbulk.ColumnMappings.Add("Address2", "Address2");
            objbulk.ColumnMappings.Add("Address3", "Address3");
            objbulk.ColumnMappings.Add("Address4", "Address4");
            objbulk.ColumnMappings.Add("County", "County");
            objbulk.ColumnMappings.Add("Eircode", "Eircode");
            objbulk.ColumnMappings.Add("LocalAuthority", "LocalAuthority");
            objbulk.ColumnMappings.Add("X", "X");
            objbulk.ColumnMappings.Add("Y", "Y");
            objbulk.ColumnMappings.Add("ITMEast", "ITMEast");
            objbulk.ColumnMappings.Add("ITMNorth", "ITMNorth");
            objbulk.ColumnMappings.Add("Latitude", "Latitude");
            objbulk.ColumnMappings.Add("Longitude", "Longitude");

            con.Open();
            objbulk.WriteToServer(dt);
            con.Close();
        }

        private void InsertExceldata2(string filepath, string filename)
        {
            string fullpath = Server.MapPath("/excelfolder/") + filename;
            ExcelConn(fullpath);
            string query = string.Format("Select * from [{0}]", "Sheet1$");
            OleDbCommand Ecom = new OleDbCommand(query, Econ);
            Econ.Open();

            DataSet ds = new DataSet();
            OleDbDataAdapter oda = new OleDbDataAdapter(query, Econ);
            Econ.Close();
            oda.Fill(ds);

            DataTable dt = ds.Tables[0];

            SqlBulkCopy objbulk = new SqlBulkCopy(con);
            objbulk.DestinationTableName = "dbo.School2";
            objbulk.ColumnMappings.Add("RollNumber", "RollNumber");
            objbulk.ColumnMappings.Add("OfficialSchoolName", "OfficialSchoolName");
            objbulk.ColumnMappings.Add("Address1", "Address1");
            objbulk.ColumnMappings.Add("Address2", "Address2");
            objbulk.ColumnMappings.Add("Address3", "Address3");
            objbulk.ColumnMappings.Add("Address4", "Address4");
            objbulk.ColumnMappings.Add("County", "County");
            objbulk.ColumnMappings.Add("Eircode", "Eircode");
            objbulk.ColumnMappings.Add("PhoneNumber", "PhoneNumber");
            objbulk.ColumnMappings.Add("Email", "Email");
            objbulk.ColumnMappings.Add("PrincipalName", "PrincipalName");
            objbulk.ColumnMappings.Add("DeisSchool", "DeisSchool");
            objbulk.ColumnMappings.Add("SchoolGender", "SchoolGender");
            objbulk.ColumnMappings.Add("PupilAttendanceType", "PupilAttendanceType");
            objbulk.ColumnMappings.Add("IrishClassification", "IrishClassification");
            objbulk.ColumnMappings.Add("GaeltachtArea", "GaeltachtArea");
            objbulk.ColumnMappings.Add("FeePayingSchool", "FeePayingSchool");
            objbulk.ColumnMappings.Add("Religion", "Religion");
            objbulk.ColumnMappings.Add("OpenClosedStatus", "OpenClosedStatus");
            objbulk.ColumnMappings.Add("TotalGirls", "TotalGirls");
            objbulk.ColumnMappings.Add("TotalBoys", "TotalBoys");
            objbulk.ColumnMappings.Add("TotalPupils", "TotalPupils");

            con.Open();
            objbulk.WriteToServer(dt);
            con.Close();
        }
    }

Cheers

edit: My database and security groups are set up correctly as I can view lists of entity framework data from the database on my application. I can also login also so the databases are connected fine. The only problem is the upload button does not work when deployed (it does work locally on IIS though)

Answer 1

Check the permissions on the IAM role, Allow the IP access from server A to server B.