How to keep user requests on the same server when using IIS NLB?

I have two IIS servers running using NLB. Unfortunatelly I cannot use shared session server, so every server is using its own session. How can I ensure, that all requests from the same user are forwarded to the same IIS server?

Solution

I think what you're looking for is Sticky Sessions. Sticky sessions are implemented by your load balancer though. You probably need to setup an outside load balancer (BIG-IP, HAProxy, etc.) that can do sticky sessions.