The remote computer refused the network connection

[Win32Exception (0x80004005): The remote computer refused the network connection]

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - The remote computer refused the network connection.)]
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling, SqlAuthenticationProviderManager sqlAuthProviderManager)  1524
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)  467
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)  70
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)  940
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)  111
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)  1567
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)  118
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)  268
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)  315
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)  128
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)  265
   System.Data.SqlClient.SqlConnection.Open()  133
   System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Action`2 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)  964
   System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext)  503
   System.Data.Entity.SqlServer.<>c__DisplayClass1.b__0()  18
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation)  234
   System.Data.Entity.Core.EntityClient.EntityConnection.Open()  321

[EntityException: The underlying provider failed on Open.]
   System.Data.Entity.Core.EntityClient.EntityConnection.Open()  741
   System.Data.Entity.Core.Objects.ObjectContext.EnsureConnection(Boolean shouldMonitorTransactions)  167
   System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)  63
   System.Data.Entity.Core.Objects.<>c__DisplayClass7.b__5()  192
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation)  234
   System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)  357
   System.Data.Entity.Core.Objects.ObjectQuery`1..GetEnumerator>b__0()  30
   System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()  39
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)  453
   System.Linq.Enumerable.ToList(IEnumerable`1 source)  73
   naft.Controllers.HomeController.FeedNews(Int32 NewsType)  55
   lambda_method(Closure , ControllerBase , Object[] )  141
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)  229
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)  35
   System.Web.Mvc.Async.AsyncControllerActionInvoker.b__36(IAsyncResult asyncResult, ActionInvocation innerInvokeState)  39
   System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)  70
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)  42
   System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3c()  72
   System.Web.Mvc.Async.<>c__DisplayClass45.b__3e()  396
   System.Web.Mvc.Async.<>c__DisplayClass45.b__3e()  396
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult)  42
   System.Web.Mvc.Async.<>c__DisplayClass28.b__19()  38
   System.Web.Mvc.Async.<>c__DisplayClass1e.b__1b(IAsyncResult asyncResult)  188
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult)  38
   System.Web.Mvc.Controller.b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState)  32
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)  68
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)  52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)  39
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult)  38
   System.Web.Mvc.MvcHandler.b__4(IAsyncResult asyncResult, ProcessRequestState innerState)  46
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)  68
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)  38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()  431
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)  75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)  158