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This page contains common errors and misconfiguration.

strace shows:
sin_addr=inet_addr("xx.xx.xx.xx")}, yy) = -1 EINVAL (Invalid argument)
  1. check all netmasks on all interfaces (do they overlap) ?
  2. check policy routing (disable it temporary) ?
  3. check that lo is up (Networking within a host/vserver always uses lo interface)