It means that the server is trying to connect to some other remote server to deliver the packet that the client sent and that operation is failing. The reason why Openfire is trying a server-2-server operation is that the domain that the client specified in the TO attribute of the packet is not the same of the Openfire server. For instance, if your XMPP domain is miservidor.com and in the TO attribute of the packet sent by the client you specify goseta then Openfire will try to find a server named goseta to deliver the packet.
i realize this was resolved a long time ago, but how was it fixed exactly as this thread seems to be the only one where the use experienced the same issue i did and it got fixed…