Log into the ASL GUI, click on the ASL tab and select the Blocking menu option. This will open the window of any IPs ASL is blocking. Just check the "unblock" box next to the IP address(es) you wish to unblock and then click the "update" button.
You can also do this from the command line, however we do recommend using the ASL Web GUI for ease of use. To accomplish this from the command line, run this command as root:
asl -ub <IP to unblock>
asl -ub <network to unblock>
asl -ub 111.222.333.444
asl -ub 111.222.333.0/24
Note: Networks must be in CIDR format.