This usually happens when you have 64-bit code that tries to access an Access database but you haven't installed the 64-bit Access drivers (or there is otherwise some mismatch). It's not the only possibility but the most common one, so first just download and install the redistributable from Microsoft:

https://www.microsoft.com/en-us/download/details.aspx?id=13255

You should get a 32-bit driver and a 64-bit one so make sure you install the one that matches the bitness of your website code.

Thank you.

Meanwhile, my Web.Config has the following:

  <connectionStrings>
    <remove name="LocalSqlServer" />
    <remove name="LocalSqlServer" />
    <add name="LocalSqlServer" providerName="System.Data.SqlClient" connectionString="data source=103.133.214.169,1433;Initial Catalog=MyDB;Integrated Security=False;User=MyUsr;Password=MyPW" />
    <remove name="LocalMySqlServer" />
  </connectionStrings>

This worked fine in .NET 3.5 Shared Hosting. Now I am in .NET 4.5 VPS.

Any comments here?