isakmpd stops forwarding data over enc0

[Sean Knox <sean_(_at_)_obstacle9_(_dot_)_com>]

Sometime this morning, our openbsd firewall/VPN server entered a state
where it stopped forwarding encrypted traffic over the enc0 interface. Incoming
roadwarrior connections establish tunnels fine, but nothing is sent over
enc0. There have been no isakmpd or pf configuration changes. There's
nothing in the logs that seems indicate a problem.

any ideas?

thanks,
Sean