"jwt.private.key" and "jwt.public.key" properties are not generated during Confluence DC upgrade from 5.x to 6.x.

The workaround is to create a fresh Confluence installation (either DC or demo would work) and copy appropriate properties from confluence.cfg.xml file from confluence home directory, for example:

<property name="jwt.private.key">XXXXXXX</property>
<property name="jwt.public.key">YYYYYY</property>

Workaround

1. Download attached jar utility Sec.jar, run it from the command line (this can be run on any system with Java, not necessarily the server):

   java -jar Sec.jar
   

2. Copy and paste the output into confluence.cfg.xml before the </properties> tag, and restart Confluence for the changes to take effect.