Microsoft® Lync® Server 2013 Unleashed Second Edition

Cookie Persistence

When Lync Server 2010 was first released, each reverse proxy component required only Layer 4 Source IP persistence for connections. This meant that based on the client’s IP address it would continue to be directed to the same real server by a load balancer as long as that server was still responding.

When the Lync Mobile clients were released, this guidance shifted such that cookie-level affinity was required at the load balancers in front of a reverse proxy. Cookie persistence is a small piece of information stored on the client that identifies a particular session on the load balancer. When the client makes a connection request, the load balancer uses the information held in the cookie to route the request to a real server. ...