Wifi connects, ping works, but no UDP or web requests

Official Hardware Nano Family Nano RP2040 Connect
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I'm using WifiNINA on a Nano RP2040 Connect. I want to send UDP packets, but no joy.
Trying to debug, so far I have confirmed:

  • WiFi connection succeeds -- from code on the board I get the same
    MAC address and the same local IP address that I can see in my router admin UI
  • ping succeeds -- calling WiFi.ping() for a variety of internal
    and external servers succeed, and I can see the calls and responses
    in Wireshark
  • calls to beginPacket(remoteHost, remotePort) succeed -- return value is 1
  • calls to write(buf, numbytes) return numbytes, seeming to indicate that
    the requested number of bytes were written to the packet
  • calls to endPacket() fail -- return value is 0

I have also tried connecting to a web server and making a request;
in this case the connect(server, 80) call apparently succeeds (based
on the return value) but I cannot GET anything from the server and
I do NOT see any connection or GET requests going out to that server
in Wireshark.

What am I overlooking? What strategies can I use to further debug?

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