IP FILTER blocks USB keyboard

[oxyopes@googlemail.com]

Hello,
for the second time, in a different machine, i observe IP FILTER blocking
the keyboard. I have a Solaris 9 on a SunBlade 100 with USB keyboard
and IPFILTER 4.1.22 with pfil 2.1.12. I load the IPF rules and keep on
working normally. On the next day the machine has a normal network
behaviour and the mouse answers, but the USB keyboard is blocked and
i have to reboot to bring to normal behaviour, despite the same IPF rules
are loaded at boot time. Thus it happens with time (???)
The IPF rules are listed below. Should make a rule for the keyboard?

pass out quick on eri0 proto tcp from any to $dns port = domain flags
S/FSRPAU keep state
pass out quick on eri0 proto udp from any to $dns port = domain keep state
pass out quick on eri0 proto tcp from $myip to any port = 80 flags
S/FSRPAU keep state
pass out quick on eri0 proto tcp from $myip to any port = 443 flags
S/FSRPAU keep state
pass out quick on lo0 all
pass out quick on hme0 all
pass out quick on eri0 proto tcp from any to any port = time flags
S/FSRPAU keep state
pass out quick on eri0 proto tcp from any to any port = ftp flags
S/FSRPAU keep state
block out log first quick on eri0 all
pass in quick on lo0 all
pass in quick on hme0 all
pass in quick on eri0 proto tcp from any to $myip port = ssh flags
S/FSRPAU keep state
pass in quick on eri0 proto icmp from $friend to $myip icmp-type echo keep state
block in log first quick on eri0 all