---
title: "Detect Failed Input and Output Requests | Microsoft Docs"
ms.custom: ""
ms.date: "03/14/2017"
ms.prod: sql
ms.prod_service: "database-engine"
ms.reviewer: ""
ms.technology: security
ms.topic: conceptual
helpviewer_keywords: 
  - "Best Practices [Database Engine]"
ms.assetid: 85373b2e-d9fe-42ef-9653-6e22fe5ecab0
author: VanMSFT
ms.author: vanto
---
# Detect Failed Input and Output Requests
[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md](../../includes/appliesto-ss-xxxx-xxxx-xxx-md.md)]
  This rule checks the system event log for EventId 50. This error is caused by a failed I/O request.  
  
## Best Practices Recommendations  
 Review the following [!INCLUDE[msCoName](../../includes/msconame-md.md)] Knowledge Base articles for more information about how to troubleshoot this error:  
  
-   [Microsoft Knowledge Base article 311081](https://go.microsoft.com/fwlink/?linkid=117744)  
  
-   [Microsoft Knowledge Base article 885688](https://go.microsoft.com/fwlink/?linkid=117745)