L2-L7 Access control
L3/4IP address Access control
caveat: test, test again and beware of unintended consequences when you start denying things or rely on "deny" as a form of firewall security!
...you have to name the rule and then apply it to a WLAN (or several).
Edit WLAN and apply relevant rule in drop down of access control.
Typing 80 into port and UDP into the protocol box produces this response...so if you know the correct numbering scheme then you might get further along. Have fun.
Define each access policy by configuring a combination of the following:
Type: The access privilege (allow or deny) that this policy grants.
Destination Address: Enter an IP subnet and netmask of the network target to which you want to allow or deny access. (IP address must be in the format A.B.C.D/M, where M is the subnet mask.) Otherwise, select Any. For example, if you enter 192.168.0.1/24, the rule would allow or deny the entire Class C subnet. To allow/deny a single host, use /32 as the netmask.
Application: If you select a specific application from the menu, the Protocol and Destination Port options are automatically filled with the relevant values and are not configurable.
Protocol: Enter a network protocol number (0-254), as defined by the IANA (http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml) to allow or deny. Otherwise, select Any.
Destination Port: Enter a valid port number (1-65534) or port range (e.g., 80-443).
UDP is 17 on that (IANA) list. Perhaps you can make this work. I've learned something new - hooray!