I am receive syslog message 450001 - licensed host limit was exceeded.
From show version on my ASA 5505 (8.0.2), inside hosts are limited to 10. The limit of 10 matches the syslog error limit (10) message.
How is this number of hosts calculated? Show arp indicates 6 addresses attached to the inside interface.
Don't use "show arp", use "show local-host" instead.
In routed mode, hosts on the inside (Business and Home VLANs) count towards the limit only when they communicate with the outside (Internet VLAN).
Internet hosts are not counted towards the limit. Hosts that initiate traffic between Business and Home are also not counted towards the limit. The interface
associated with the default route is considered to be the Internet interface. If there is no default route, hosts on all interfaces are counted toward the limit.
In transparent mode, the interface with the lowest number of hosts is counted towards the host limit. See the show local-host command to view the host