


Why is my Windows Server 2008-R2 Remote Access Showing Connection Timeouts?
Jan 23, 2025 pm 04:57 PMTroubleshooting 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:
- Database Deadlocks: Simultaneous processes vying for the same resources can create a deadlock, halting execution.
- Outdated Database Statistics/Query Plan Cache: Inefficient query plans due to stale database statistics or a clogged query plan cache can significantly slow down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.
- Inefficient Queries: Complex or poorly optimized queries can take excessive time to complete.
Solutions and Troubleshooting:
Here's how to address this issue:
-
Identify Deadlocks: Use SQL Server Management Studio's Activity Monitor to detect and resolve any blocked processes.
-
Refresh Database Statistics and Clear the Query Plan Cache: Run these commands in SQL Server Management Studio:
exec sp_updatestats dbcc freeproccache
-
Force Fresh Execution Plans: Configure SQL Server to prevent the reuse of potentially suboptimal query plans.
-
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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