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Why does WCF limit concurrent connections to 5?

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What is the default max concurrent sessions in WCF?

The default value for this setting is 2,147,483,647. MaxConcurrentSessions. Limits the number of active sessions allowed for the service.

How many requests can a WCF service handle?

By default, a WCF service handles only one request at a given moment of time.

What is a concurrent connection limit?

Concurrent Connection: The maximum amount of simultaneous connections your server can handle.

What is the default max concurrent calls?

1. The default value of Maximum concurrent calls for WCF throttling is 26 . 5.


I have a WCF service (basicHttpBinding) hosted in II7 on Vista that I expect to handle many requests concurrently. I'm attempting to load test the service by spawing 200 threads in a test app and calling the WCF service. I've run this test app on the same machine as the server as well as multiple other computers and I always get the same result - no more than 5 workers are used. Is this a WCF, HTTP or IIS bottleneck?