Controller buffering the access events as seen by the increment in the AccessLog system variables, the events stay in the controller's buffer and are not sent to Cyberstation.
The most common cause of this problem is that the controller does not know who the primary/secondary access server is.
1. Make sure a Cyberstation has been designated as primary access server (and a second one as secondary if applicable).
2. Perform a teach on the primary/secondary access servers.