Why is my Windows Server 2008-R2 Remote Access Showing Connection Timeouts?

Troubleshooting Windows Server 2008 R2 Remote Access Connection Timeouts

The Problem:

Users connecting remotely to a Windows Server 2008 R2 system experience "Server Unavailable" errors and connection timeouts, resulting in the message: "Server Error in '/' Application. Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated."

Possible Causes:

This timeout error can be caused by several factors:

1. Database Deadlocks: Simultaneous processes vying for the same resources can create a deadlock, halting execution.
2. Outdated Database Statistics/Query Plan Cache: Inefficient query plans due to stale database statistics or a clogged query plan cache can significantly slow down operations.
3. Inefficient Queries: Complex or poorly optimized queries can take excessive time to complete.

Solutions and Troubleshooting:

Here's how to address this issue:

1. Identify Deadlocks: Use SQL Server Management Studio's Activity Monitor to detect and resolve any blocked processes.

2. Refresh Database Statistics and Clear the Query Plan Cache: Run these commands in SQL Server Management Studio:

   <code class="language-sql">exec sp_updatestats
   dbcc freeproccache</code>

3. Force Fresh Execution Plans: Configure SQL Server to prevent the reuse of potentially suboptimal query plans.

4. Optimize Queries: If the above steps don't resolve the problem, manually execute the problematic query. If it's slow, optimize the query for better performance.

Important Note:

The provided code snippet suggests the issue might originate from the Application_Start event, where a stored procedure (sp_OnlineUsers_Update_SessionEnd_And_Online) updates over 482,751 records. This large-scale operation is a likely culprit for the timeout. To fix this, consider relocating this update to a different event handler or scheduling it as a background task to avoid blocking the main application thread.

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