netcat-openbsd: listener doesn't work (Bug #8745)
BTW. My login is kaztost, but I am still waiting a confirmation e-mail (to gmail.com) to complete registration (and I can not proceed a discussion in #8745 (closed)).
I also have the same bug with netcat-openbsd on armhf device (kernel 3.1.10). In my case strace returns
<code class="text"> setsockopt(3, SOL_SOCKET, SO_REUSEPORT, , 4) = -1 ENOPROTOOPT (Protocol not available) </code>
So this is a issue from https://serverfault.com/questions/725231/netcat-not-able-to-bind-a-listening-socket.
To support old kernels it is neccessary to recompile netcat-openbsd with #undef SO_REUSEPORT
(from redmine: issue id 8754, created on 2018-03-31)