Fwd: Question

Please see below. This is a php application, installed in a windows environment. The load balancer is a network load balancer. One URL that users login to that routes them to either one of the web servers. The application is installed on both VMs. I have a php application that is hosted on IIS / MSSQL: - IIS 8.5 on Windows 2012 R2 - Wincache 1.3.5 / FASTCgi - PHP 5.4 - MSSQL 2008 - NLB environment with 2 web servers with approx 30-40 users hitting the web application between the two The problem I am having is that one of the IIS system periodically goes down across both of them and users are no longer able to log into the application if they are currently routed to the downed server, and they are not rerouted to the new server when they attempt to reconnect to the application. They physically have to point the URL directly to the up server in the NLB to use the second running server. Any thoughts on why this may happen? This is the event that is recorded in the IIS event log: [image: Inline image 1] Debra