Fix issue with Qemu + SPICE when IPv4 is not enabled.

gns3server/compute/qemu/qemu_vm.py

@@ -1342,8 +1342,14 @@ class QemuVM(BaseNode):
     def _spice_options(self):
 
         if self._console:
+            console_host = self._manager.port_manager.console_host
+            if console_host == "0.0.0.0" and socket.has_ipv6:
+                # to fix an issue with Qemu when IPv4 is not enabled
+                # see https://github.com/GNS3/gns3-gui/issues/2352
+                # FIXME: consider making this more global (not just for Qemu + SPICE)
+                console_host = "::"
             return ["-spice",
-                    "addr={},port={},disable-ticketing".format(self._manager.port_manager.console_host, self._console),
+                    "addr={},port={},disable-ticketing".format(console_host, self._console),
                     "-vga", "qxl"]
         else:
             return []