Hi Lennart, Thanks for your reply. It's very helpful. I think our case belongs to the exceptions where the constant monitoring is neccessory. So we will need to keep AvahiServiceResolver around. My further question is, when will the AvahiServiceResolver be free. Do I need to release the resolver somewhere in my application or  avahi itself will manage those resolvers? Thanks, Arhold <div class="gmail_quote">On Dec 18, 2007 2:28 AM, Lennart Poettering <<a href="mailto:lennart@poettering.net">lennart@poettering.net</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Fri, 30.11.07 15:21, Arhold (<a href="mailto:arhold@gmail.com">arhold@gmail.com</a>) wrote: Hi! <div class="Ih2E3d"> > In this scenario - service unreachable and then recovered, which is the > right way to handle in browser side? Is it necessary to call > avahi_service_resolver_free when AVAHI_RESOLVER_FAILURE? I try to remove > that code and when the netif was recovered, the browser will be able t o get > the service again. </div>If you keep the AvahiServiceResolver object around after having received the first AVAHI_RESOLVER_FOUND or AVAHI_RESOLVE_FAILURE event, then you will be notified whenever the service disappears/reappers/changes. It is perfectly valid to keep the resolver around for applications which want to constantly monitor a service and its service data. Please note however, that usually resolving a service is a "one-shot" thing, i.e. it should only be issued when actually connecting to a service, and not already when discovering it. There are only very few exceptions where the constant monitoring makes sense, one of them being iChat's _presence._tcp. I hope this answers your question. I didn't fully understood your problem, so if this does not answer your question, feel free to ask again. Lennart -- Lennart Poettering                        Red Hat, Inc. lennart [at] poettering [dot] net         ICQ# 11060553 <a href="http://0pointer.net/lennart/" target="_blank"> http://0pointer.net/lennart/</a>           GnuPG 0x1A015CC4 _______________________________________________ avahi mailing list <a href="mailto:avahi@lists.freedesktop.org">avahi@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/avahi" target="_blank"> http://lists.freedesktop.org/mailman/listinfo/avahi</a> </blockquote></div>