Why is Azure not dispatching HTTP requests on one of my two instances?

Question

I have an Azure web role with two instances. Both instances are \"ready\" - running okay.

On my desktop I have four instances of the same program running simultaneously

Answer 1

Looks like this behavior is due to IIS "keep alive" (. Because of "keep alive" once a client has been served by an instance it gets stuck with that instance.

Disabling "keep alive" removes that and requests now get to all instances more or less randomly. MSDN says disabling "keep alive" may reduce performance but for the sake of testing concurrent operation it would be okay.