This issue has now occurred on a second device, a Samsung Galaxy (AT&T) using 3G data service when wifi is on but unconnected.
On Jan 13, 1:03 pm, Dan <[email protected]> wrote: > I have tried specifying our local dns servers and Google's public dns > server. > > Using the local servers I get this error: > ### WARNING: could not add DNS server '192.168.<snip>' to the network > stack > ### WARNING: will use system default DNS server > > Using Google's public dns server I get this message: > DNS server name '8.8.8.8' resolved to 8.8.8.8:55 > > The Exception still occurs for either configuration. > > -Dan > > On Jan 13, 12:17 pm, Kostya Vasilyev <[email protected]> wrote: > > > > > > > > > Perhaps the emulator has trouble mirroring your computer's DNS setup. > > >http://developer.android.com/guide/developing/tools/emulator.html#dns > > > You could try starting the emulator with -dns-server <serverList> option > > to manually specify the addresses of your computer's DNS servers, to see > > if it makes the behavior consistent with the host computer. > > > -- Kostya > > > 13.01.2011 23:09, Dan пишет: > > > > After testing on an emulator and at the same time the host computer is > > > able to resolve the domain name this issue cannot be isolated to wifi > > > problems. > > > > -Dan > > > > On Jan 12, 11:00 pm, Bob Kerns<[email protected]> wrote: > > >> UnknownHostException means your device was unable to get a positive > > >> response to the DNS query trying to look up the hostname. > > > >> It doesn't distinguish between "We couldn't talk to the DNS server", > > >> "we have no network connection right now", "we have never even HEARD > > >> of net work, what's that?", or "we carefully and thoroughly discussed > > >> it with the DNS server, which in turn discussed it with the relevant > > >> authoritative DNS servers, and can conclusively state, that the host > > >> named does not exist at this time". > > > >> What you CAN say, is it never got to the point of actually trying to > > >> talk to that host, because it didn't get enough information to do so. > > >> That is, it is not saying "we've heard of that host, but it doesn't > > >> seem to be there". > > > >> The most likely cause is a temporary failure in your wifi connection, > > >> just as it was trying the DNS lookup. But the DNS server itself could > > >> be to blame, or if it's a DNS server on your site, the connection > > >> upstream, or an upstream DNS server could be to blame. > > > >> I use my local wifi server as a DNS server. It's been giving me > > >> problems like this lately, even on wired connections. Plus, it is not > > >> compatible with IPv6, so I'm going to need to upgrade it soon. I could > > >> configure it to advertise OpenDNS servers instead (which is what it > > >> itself is using), but have slightly longer lookups and no cached data > > >> if the cable connection hiccups. If it's the cable connection that's > > >> at fault, then I'll have these problems anyway. It won't be easy to > > >> track down. > > > >> On Jan 12, 8:44 pm, Ankur Avlani<[email protected]> wrote: > > > >>> Unfortunately, the server is not local. > > >>> On Wed, Jan 12, 2011 at 4:15 PM, Dan<[email protected]> wrote: > > >>>> Hello All, > > >>>> I have had this error both on emulator and a Motorola Droid while > > >>>> using a WIFI connection. I have surrounded the http request with WIFI > > >>>> state checks and before and after WIFI is reported state 3 > > >>>> (WIFI_STATE_ENABLED) and a connection speed of 54 . I have also > > >>>> confirmed, using an adb shell with the emulator, that the emulator > > >>>> cannot ping the website in question giving a domain resolution error. > > >>>> To compare notes with Ankur, is the server on your LAN and the IP used > > >>>> internal? mine is. > > >>>> I have also tried AndroidHttpClient which does work on the same url. > > >>>> -Dan > > >>>> On Jan 12, 12:23 pm, Ankur Avlani<[email protected]> wrote: > > >>>>> True, I agree with what you say. Its just that I feel, other apps > > >>>>> should > > >>>>> also break or give error. > > >>>>> Anywayz, Thanks a lot for your inputs. > > >>>>> regards, > > >>>>> Ankur. > > >>>>> On Wed, Jan 12, 2011 at 12:17 PM, Brill Pappin<[email protected]> > > >>>>> wrote: > > >>>>>> Well i suppose thats possible if your messing with the network stack, > > >>>>>> but it's pretty low level for Java/Android. > > >>>>>> I guess its also possible that the Android version you have has a > > >>>>>> crappy stack or driver... or you have rooted it and have been messing > > >>>>>> around under the covers so to speak. > > >>>>>> There is nothing in Android really that would allow you to mess it up > > >>>>>> that badly AFAIK, so I doubt it's your application causing the > > >>>>>> problem > > >>>>>> if your not specifically getting under the covers. > > >>>>>> However, the meaning of the exception is clear: > > >>>>>>http://download.oracle.com/javase/1.4.2/docs/api/java/net/UnknownHost. > > >>>> .. > > >>>>>> and your app doesn't really control the process of translating a > > >>>>>> domain to an ip. > > >>>>>> - Brill Pappin > > >>>>>> On Jan 12, 2:54 pm, Ankur Avlani<[email protected]> wrote: > > >>>>>>> Somehow I have this feeling it is related to my app only. Other > > >>>>>>> apps > > >>>> on > > >>>>>> the > > >>>>>>> phone, I don't see any such issue. Even when browsing on my phone, > > >>>>>>> I > > >>>>>> don't > > >>>>>>> see any error. > > >>>>>>> On Wed, Jan 12, 2011 at 11:41 AM, Kumar Bibek<[email protected]> > > >>>>>> wrote: > > >>>>>>>> By Wi-Fi, I meant, you phone's Wi-Fi could be turning on and off. > > >>>> There > > >>>>>> is > > >>>>>>>> no other reason I can think of. It happens for me as well, > > >>>> sometimes. > > >>>>>>>> Kumar Bibek > > >>>>>>>>http://techdroid.kbeanie.com > > >>>>>>>>http://www.kbeanie.com > > >>>>>>>> On Thu, Jan 13, 2011 at 1:10 AM, Ankur Avlani< > > >>>> [email protected] > > >>>>>>> wrote: > > >>>>>>>>> I am sorry, that somehow doesn't convince me. I am connected to > > >>>> the > > >>>>>> same > > >>>>>>>>> wifi on my laptop and i never see any web page load error on my > > >>>>>> laptop. > > >>>>>>>>> On Wed, Jan 12, 2011 at 11:38 AM, Kumar Bibek< > > >>>> [email protected] > > >>>>>>> wrote: > > >>>>>>>>>> Yup, then it's a problem with your Wi-Fi. > > >>>>>>>>>> Kumar Bibek > > >>>>>>>>>>http://techdroid.kbeanie.com > > >>>>>>>>>>http://www.kbeanie.com > > >>>>>>>>>> On Thu, Jan 13, 2011 at 1:07 AM, Ankur Avlani< > > >>>> [email protected] > > >>>>>>> wrote: > > >>>>>>>>>>> I am connected to network, I am on Wifi. If i try again it > > >>>> works. > > >>>>>> Its > > >>>>>>>>>>> just random. > > >>>>>>>>>>> On Wed, Jan 12, 2011 at 11:34 AM, Kumar Bibek< > > >>>> [email protected] > > >>>>>>> wrote: > > >>>>>>>>>>>> This error/exception comes because of no network connectivity. > > >>>>>>>>>>>> Kumar Bibek > > >>>>>>>>>>>>http://techdroid.kbeanie.com > > >>>>>>>>>>>>http://www.kbeanie.com > > >>>>>>>>>>>> On Thu, Jan 13, 2011 at 1:02 AM, Ankur Avlani< > > >>>>>> [email protected]>wrote: > > >>>>>>>>>>>>> Hi All, > > >>>>>>>>>>>>> I am developing an application on Android. I have seen that > > >>>> at > > >>>>>> times > > >>>>>>>>>>>>> when I try to connect using HttpURLConnection, for getting an > > >>>>>> Image or > > >>>>>>>>>>>>> anydata, I get the following error: > > >>>>>>>>>>>>> 01-12 11:24:05.073: WARN/System.err(16780): > > >>>>>>>>>>>>> java.net.UnknownHostException: Host is unresolved: > > >>>>www.XXX.com:80. > > >>>>>>>>>>>>> Note: I get this error on my Motorolla Droid and not in > > >>>> emulator. > > >>>>>>>>>>>>> Any ideas? > > >>>>>>>>>>>>> Thanks, > > >>>>>>>>>>>>> Ankur > > >>>>>>>>>>>>> -- > > >>>>>>>>>>>>> You received this message because you are subscribed to the > > >>>> Google > > >>>>>>>>>>>>> Groups "Android Developers" group. > > >>>>>>>>>>>>> To post to this group, send email to > > >>>>>>>>>>>>> [email protected] > > >>>>>>>>>>>>> To unsubscribe from this group, send email to > > >>>>>>>>>>>>> [email protected]<android-developers%2Bunsubs > > >>>>>>>>>>>>> [email protected]><android-developers%2Bunsubs > > >>>> [email protected]><android-developers%2Bunsubs > > >>>>>> [email protected]> > > >>>>>>>>>>>>> For more options, visit this group at > > >>>>>>>>>>>>>http://groups.google.com/group/android-developers?hl=en > > >>>>>>>>>>>> -- > > >>>>>>>>>>>> You received this message because you are subscribed to the > > >>>> Google > > >>>>>>>>>>>> Groups "Android Developers" group. > > >>>>>>>>>>>> To post to this group, send email to > > >>>>>>>>>>>> [email protected] > > >>>>>>>>>>>> To unsubscribe from this group, send email to > > >>>>>>>>>>>> [email protected]<android-developers%2Bunsubs > > >>>>>>>>>>>> [email protected]><android-developers%2Bunsubs > > >>>> [email protected]><android-developers%2Bunsubs > > >>>>>> [email protected]> > > >>>>>>>>>>>> For more options, visit this group at > > >>>>>>>>>>>>http://groups.google.com/group/android-developers?hl=en > > >>>>>>>>>>> -- > > >>>>>>>>>>> You received this message because you are subscribed to the > > >>>> Google > > >>>>>>>>>>> Groups "Android Developers" group. > > >>>>>>>>>>> To post to this group, send email to > > >>>>>>>>>>> [email protected] > > >>>>>>>>>>> To unsubscribe from this group, send email to > > >>>>>>>>>>> [email protected]<android-developers%2Bunsubs > > >>>>>>>>>>> [email protected]><android-developers%2Bunsubs > > >>>> [email protected]><android-developers%2Bunsubs > > >>>>>> [email protected]> > > >>>>>>>>>>> For more options, visit this group at > > >>>>>>>>>>>http://groups.google.com/group/android-developers?hl=en > > >>>>>>>>>> -- > > >>>>>>>>>> You received this message because you are subscribed to the > > >>>> Google > > >>>>>>>>>> Groups "Android Developers" group. > > >>>>>>>>>> To post to this group, send email to > > >>>>>> [email protected] > > >>>>>>>>>> To unsubscribe from this group, send email to > > >>>>>>>>>> [email protected]<android-developers%2Bunsubs > > >>>>>>>>>> [email protected]><android-developers%2Bunsubs > > >>>> [email protected]><android-developers%2Bunsubs... > > read more » -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
