Summary
How to configure FNMS to support load balancing multiple web application servers
Synopsis
In order to support multiple web application servers via a load balancer, the web application's machine key must be identical between all web application servers.
Discussion
In each FNMS web application server, browse to the <INSTALLDIR>\FlexNet Manager Platform\WebUI\Web.config file and inside the xml file there will be a machineKey element like
<machineKey validiationKey=DF23423DABE3810..... />
You must copy this element to all other web application server's web.config to ensure that cookies and session state can be encrypted/decrypted between all application servers.
Also, it is recommended to do the same for <INSTALLDIR>\FlexNet Manager Platform\SAP\Portal\web.config so users can use the SAP portal via a load balancer as well.
Additional Information
At the time of writing this KB article is valid for FNMS 2015, 2015 R2 and 2015 R2 SP1.
