JBAS014516: Failed to acquire a permit within 5 MINUTES
is from the instance-pool for the beans, so I think there is one bean where you don't have enough instances within the strict-max-pool.
AFAIR the former versions use some kind of open-end pool.
So I would enable the statistics for EJB's to see more details, but you can check without whether you see high number of current pool entries as it will only grow but never shrink until you shut down.
So it might be a very basic EJB which is needed from all others