I uploaded my website( that is programmed with asp.net mvc and entity framework 5 ) yesterday and wrote this connection string in the web.config file of the host root ( control panel is plesk onyx) I tried changing it to SqlCLient ,Removing some tags, and so many other things but no change it return error: keyword not supported: 'data source' when I remove data source it return keyword not supported 'initial catalog' and so on thanks for your attention <add name="ShopDBEntities" connectionString="Data Source=some source;initial catalog=MainDB;User ID=admin;Password=pass;integrated security