Squid dropping connection.

Hello guys, when this option "Allow users on interface" is enabled on the Proxy Server anyone on the network can access the internet. What can it be?

Field Description:
If this field is checked, the users connected to the interface selected in the 'Proxy interface' field will be allowed to use the proxy, i.e., there will be no need to add the interface's subnet to the list of allowed subnets. This is just a shortcut.

Images with the settings.

I do not know what can be. Would if I uninstall and reinstall works?

I installed, and then climbed the settings from a backup that was here the version of pfSense 2.0.1.

I'm afraid to uninstall and give problem in pfSense. Can not stop here in the company.