Capability to check UDP's ports, for services with just an udp port
For some services we have only a UDP port to check, just tcp is aviable at this moment.
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Indeed that's an idea but unfortunately there's no notion of "connection" for UDP so it's not possible to know if a port is filtered or if a service is simply not responding because it waits for a specific message for example. There is just one obvious case when the port is "officially" closed and so a response is sent to tell you that. Which kind of service would you like to monitor? would it require to send a specific packet? would it need to check for a response? Is just knowing that no response is received (not knowing if it's filtered or open) enough for your use-case?
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Olivier Mary commented
Somes games servers have all port only udp