from 8.4 R04 Service configuration needs 2 new values. The installation documentation has been updated with this info:
From 8.4 R04 Service needs to know NetServer's symmetric keys which are used to encrypt traffic from NetServer to Service. This is used to enable NetServer to call Service.
Enter the SymmetricKey value found in the web.config file for NetServer:
Enter the SymmetricSecret value found in the web.config file for NetServer:
You will find both values in the NetServer's Web.config, in the Security - Cryptography section. Enter the value part without the quotes.
For installations where you run upgrade.exe (or ejTermsetup.exe for new installations), the program asks for the keys if they do not exist. It will then test whether the keys are correct.
When running upgrade.exe interactively, upgrade.exe must update its config file with these values. If you do not run upgrade.exe then the values must be manually added to the config file.