Reverse proxy squid3 problem

[Darkmagister]

hi, i've followed a lot of thread and guide here and on the wiki, to make few sites, in different server behind pfsense firewall with only one ip address accessible from outside
so i have a pfsense 2.2
i've installed squid3 and set net.inet.ip.portrange.reservedhigh  to 0 so i can use port lower than 1024

i've followed a guide, so here my configuration of squid:
Reverse Proxy interface WAN
external FQDN domain.com
Enable HTTP reverse mode
Port 81 (i've used this port because if i use the default 80 it goes directly to the pfsense login page)
ok web server i've added one:
alias dev1
ip 192.168.10.11
port 80
http

on mapping:
peer: dev1
URI: ^http://new.domain.com/.*

i've also added a rules on firewall:
from WAN
port 81

but now if i try to connect to new.domain.com:81 i receive an access error from squid

ERROR
The requested URL could not be retrieved

Access Denied

any idea why? any helps?

thanks