文件服务器无法上传附件

文件服务器与应用服务器分开部署，在同一个网络环境下，配置完成后检测文件服务可用，单据新增附件时系统报错，上传文件至。。文件服务器失败，请检查文件服务器相关配置System.Data.SqlClient.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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) ---> System.ComponentModel.Win32Exception (0x80004005): 系统找不到指定的文件。
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)
at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout)
at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance)
at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at Kingdee.BOS.App.Data.AbstractDatabase.GetNewOpenConnection()
at Kingdee.BOS.App.Data.AbstractDatabase.GetOpenConnection(Boolean disposeInnerConnection)
at Kingdee.BOS.App.Data.AbstractDatabase.ExecuteReader(DbCommand command, IEnumerable`1 paramList, CommandBehavior cmdBehavior, Boolean bNewCn)
at Kingdee.BOS.App.Data.AbstractDatabase.ExecuteReader(DbCommand command, IEnumerable`1 paramList, CommandBehavior cmdBehavior)
at Kingdee.BOS.App.Data.DBUtils.ExecuteReader(Context ctx, String strSQL, IEnumerable`1 paramList, CommandType cmdtype, CommandBehavior cmdBehavior, Boolean bNewCn)
at Kingdee.BOS.App.Data.DBUtils.ExecuteReader(Context ctx, String strSQL, IEnumerable`1 paramList, CommandType cmdtype, Boolean bNewCn)
at Kingdee.BOS.App.Data.DBUtils.ExecuteReader(Context ctx, String strSQL, SqlParam param, CommandType cmdtype)
at Kingdee.BOS.FileServer.App.Core.KDFileService.UpdateFileServerInfoCache(String dbId)
at Kingdee.BOS.FileServer.App.Core.KDFileService.GetFileServerDirInfo(String dbId)
at Kingdee.BOS.FileServer.Web.FileService.CreateUploadFile(String filename, String fileId, String dbId, Boolean last, Stream stream, Boolean isAttachment, String fileserverId)
at Kingdee.BOS.FileServer.Web.FileService.Upload2Attachment2(String filename, String fileId, String dbId, Boolean last, Stream stream, String fileserverId)
ClientConnectionId:00000000-0000-0000-0000-000000000000