Your IIS configuration adjustments are well-considered, especially for improving uptime and handling higher traffic volumes. Here are additional adjustments and troubleshooting techniques that may further reduce your intermittent timeouts and disconnections:

Additional IIS Configuration Adjustments Application Pool - Private Memory Limit:

Set a specific private memory limit for the application pool. Recommendation: Increase this limit slightly above the expected memory usage of your app if possible, to avoid recycling due to memory exhaustion. The default for a 64-bit application pool is unlimited, but setting a limit allows for controlled recycling. Application Initialization:

Enable application initialization to keep the application "warm" and ready to respond without initial delays. How: This can be configured in the application settings by setting startMode to AlwaysRunning and enabling preload in IIS. Enable Dynamic Compression:

Dynamic compression in IIS reduces the amount of data transferred, which can improve performance and reduce network-related timeouts. How: In IIS Manager, navigate to Compression and enable Dynamic Compression for requests that would benefit from it (HTML, JSON, XML). Enhanced Logging:

Enable detailed logs in IIS, especially for failed requests. This can help pinpoint the specific conditions causing the intermittent timeouts or disconnections. How: In IIS Manager, enable Failed Request Tracing Rules and configure it to log on status codes like 500 or 503. SQL Server Configuration Considerations Connection Pooling:

Connection pooling can significantly improve performance by reusing active connections rather than opening and closing new ones repeatedly. How: Enable connection pooling in your application's database connection string by setting Pooling=True (if not already enabled). Adjust Max Pool Size and Min Pool Size based on the typical load. SQL Server Timeout: Increase the SQL connection timeout and command timeout, especially for complex queries or batch operations. For instance, setting the timeout to 60 seconds or more can help for heavy SQL operations. SQL Server Network Packet Size:

Increasing the packet size can improve data throughput, especially for large query results. How: In the SQL Server properties, consider adjusting the Network Packet Size setting (default is 4096 bytes) to 8192 or higher, depending on the application’s data transfer needs. SQL Server Memory Allocation:

Ensure that SQL Server has sufficient memory allocated to handle query processing. Limiting the max server memory can help avoid SQL Server consuming all available system memory, which can lead to app pool recycling due to memory exhaustion. How: In SQL Server Management Studio (SSMS), under Server Properties > Memory, set a maximum value for the server memory based on your server’s RAM capacity and other applications’ needs. Database Index Optimization:

Regularly updating and rebuilding indexes on frequently queried tables can reduce query execution times and alleviate timeout issues. How: Schedule regular index maintenance, especially for tables that see a lot of insert, update, or delete operations. Other Troubleshooting Techniques Review Event Logs and SQL Profiler:

IIS and SQL Server Event Logs provide insights into app and server errors. SQL Server Profiler can help detect long-running queries or deadlocks that may be causing delays. How: Use SQL Profiler to track queries with high durations, frequent deadlocks, or any unusual wait types. Windows Performance Monitor (PerfMon):

Use PerfMon to monitor specific IIS and SQL Server counters, such as: Requests in Application Queue (IIS): Helps to determine if requests are backing up. Process\Working Set (SQL Server): To observe memory usage. SQL Server: General Statistics\Logins/sec: Detects connection attempts, useful for pooling analysis. Load Testing:

Conduct load testing with tools like Apache JMeter or Microsoft’s Web Application Stress Tool to simulate traffic and identify thresholds where issues occur.