Why Are My Concurrent HTTP Requests Limited in Windows, and How Can I Increase the Limit?

Concurrent HTTP Requests Limited in Windows

Problem:

An application attempting to make multiple HTTP requests in parallel is encountering performance limitations despite using thread pooling. Investigation suggests that Windows may be imposing connection limits.

Registry Configuration:

An attempt was made to adjust the registry values MaxConnectionsPerServer and MaxConnectionsPer1_0Server to increase the allowed simultaneous connections. However, this configuration change did not improve performance.

Solution:

The actual limiting factor lies in the ServicePoint class responsible for managing HTTP connections. By default, ServicePoint allows a maximum of 2 concurrent connections. This can be overridden by setting the ServicePointManager.DefaultConnectionLimit property.

Code Sample:

// Set the maximum number of concurrent connections allowed per ServicePoint
ServicePointManager.DefaultConnectionLimit = 20;

By adjusting this property, the application can accommodate a greater number of concurrent HTTP requests, thereby improving throughput.

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