How do you block or filter traffic to udp port 192?

We are a company trying to stay an "apple office". We use an airport express for our networking and have recently been trying to become PCI "Payment Card Industry" Compliant for our credit card terminal that uses our wireless network. A company hired by the credit card processing company is running scans on our system and we keep failing because of UDP port 192. The specific message they are sending us is:
"Synopsis : The remote host is a wireless access point. Description : The remote host is an Airport, Airport Extreme or Airport Express wireless access point. It is possible to gather information about the remote base station (such as its connection type or connection time) by sending packets to UDP port 192. An attacker connected to this network may also use this protocol to force the base station to disconnect from the network if it is using PPPoE, thus causing a denial of service for the other users. Solution: Filter incoming traffic to this port and make sure only authorized hosts can connect to the wireless network this base station listens on."
I have tried changing all the settings using the Airport Utility including creating a closed network; un-checking allow setup over WAN, un-checking allow SNMP; using 128 bit encryption. I looked all over apple discussions and the internet and can't find a solution. The testing company told me that I need to find out how to filter traffic to udp port 192 or block the port altogether. Any help or guidance is greatly appreciated as we keep failing these scans.

Hi All. I am having the exact same problem with my PCI payment card industry compliance - where I will now be charged a monthly fee because I cannot alleviate this port 192 problem with my airport extreme base station. They very much consider it a security risk and won't budge. They want me to filter/block incoming traffic on this 192 port, I don't know what to do to satisfy their requirements. I have searched and read all the main discussions but, none actually offer a solution - just folks like us looking for help. I also closed network by un-allowing all options in airport utility. I also de-selected automatic date and time stamp. I would very much appreciate any possible suggestions as prefer to remain a long time loyal mac user but cannot afford the monthly fee to be imposed. There's gotta be a solution. I thought mac was ahead of the game in this (and all) areas. Thanks.

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How do you block or filter traffic to udp port 192?

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