On this page you can control which IP addresses are allowed to access your Jabber server. If any addresses are entered into the Allowed client IPs section, then only those addresses will be granted access - otherwise any address will be allowed to connect. However, any address listed in the Denied client IPs section will be blocked, whether it is on the allowed list or not.

Both fields accept IP addresses (like 1.2.3.4) or IP/netmask pairs (like 1.2.3.0/255.255.255.0) for specifying an entire network.