Error: j.i.IOException: Premature close

Gatling (Open-Source)
1

While I am running concurrent users load, if I put in more than 2000 users, I get error j.i.IOException: Premature close

Works fine if I load about 1500 or 1800, if l give load beyond that, I get this exception If I run about 5000 requests, about 30% requests will have this error.
My Injection code below.

setUp(
  scn.inject(
    atOnceUsers(5000)

  )
2

It most likely means your application can’t withstand such load and kill connections even though requests are flying.

3

Seriously? It’s an ec2 t2 large instance just with nginx in it.