Issue with Load Runner Controller 11.5

Hi,

We are facing one issue with controller. We have installed controller 11.5 on the server and when we run a test with 20 vusers or above the controller gets hanged. It works fine with 1 or 2 vusers.

We have 1000 vusers license. RAM 32GB, CPU 2.6 Ghtz.

Please let us know if there is any fix for this issue.

Thanks,