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Follow-up for the sake of the archives: The question I raised is whether getifaddrs *should* report an IP address of 0/0 in this case. After checking what happens on Linux, Corinna agreed that it should not do this, and we've now changed it: https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=b88d686a68d7bf2ff22d857a28d37fe4fdbafdf2 Ken