Internal Server Error

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SqlException: 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, uint waitForMultipleObjectsTimeout, bool allowCreate, bool onlyOneCheckConnection, DbConnectionOptions userOptions, out DbConnectionInternal connection)

Win32Exception: 系统找不到指定的文件。

SqlException: 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)

System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, uint waitForMultipleObjectsTimeout, bool allowCreate, bool onlyOneCheckConnection, DbConnectionOptions userOptions, out DbConnectionInternal connection)

System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource<DbConnectionInternal> retry, DbConnectionOptions userOptions, out DbConnectionInternal connection)

System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource<DbConnectionInternal> retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, out DbConnectionInternal connection)

System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource<DbConnectionInternal> retry, DbConnectionOptions userOptions)

System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource<DbConnectionInternal> retry, DbConnectionOptions userOptions)

System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource<DbConnectionInternal> retry)

System.Data.SqlClient.SqlConnection.Open()

Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(bool errorsExpected)

Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(bool errorsExpected)

Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable<T>+Enumerator.BufferlessMoveNext(DbContext _, bool buffer)

Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute<TState, TResult>(TState state, Func<DbContext, TState, TResult> operation, Func<DbContext, TState, ExecutionResult<TResult>> verifySucceeded)

Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable<T>+Enumerator.MoveNext()

System.Linq.Enumerable.TryGetFirst<TSource>(IEnumerable<TSource> source, out bool found)

lambda_method(Closure )

Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider+ResultEnumerable<T>.GetEnumerator()

Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider+ExceptionInterceptor<T>+EnumeratorExceptionInterceptor.MoveNext()

System.Linq.Enumerable.TryGetFirst<TSource>(IEnumerable<TSource> source, out bool found)

System.Linq.Enumerable.First<TSource>(IEnumerable<TSource> source)

Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler+<>c__DisplayClass15_1<TResult>.<CompileQueryCore>b__0(QueryContext qc)

Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute<TResult>(Expression query)

Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute<TResult>(Expression expression)

System.Linq.Queryable.FirstOrDefault<TSource>(IQueryable<TSource> source)

Coldairarrow.Web.PathRewritingMiddleware.Invoke(HttpContext context, IHttpContextAccessor accessor) in PathRewritingMiddleware.cs

Microsoft.AspNetCore.Builder.UseMiddlewareExtensions+<>c__DisplayClass4_1.<UseMiddleware>b__2(HttpContext context)

Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)

Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

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