Security Rules Don't Take Effect on Rim Nodes Until They Are Restarted

In some rare circumstances we have seen security rule changes not take effect on rim nodes until after the nodes are restarted. 

Environment:
Qlik Sense Enterprise April 2018 or earlier

For example, creating a new stream or granting user access to an existing stream.
When you encounter this problem the user will be able to access the stream as expected on the central node, but not when connected to a rim node. This may not even impact all rim nodes.

This was caused by a bug in the notification system. The rule changes take effect, but the rules cache is not adjusted on the target system. It is fixed from Qlik Sense September 2018 and later.