Disable IPV6 Problems Squid3 and Squid3-dev
Disabling ipv6 support in the pfsense gui squid3 squid3-dev and not open port 3128.
Testing with another port also does not work, so how is closed. Testing with the support ipv6 enabled works. In this situation I can not use the ipv6 support as it has a bug in the openvpn pfsense 2.1