ICMP and Java have had a long and sordid history, IIRC. You might
consider doing your own ping via the NDK.
Personally, I would have the server monitor running on a server, and
have the Android app only be a control panel/notification mechanism,
but that's just me.
On Mon, Dec 27, 2010 at 2:02 PM, bc <clarkbrianc...@gmail.com> wrote:
> Thank you for the replies.
>
> Perhaps I should give a little background on this phenomena. A few
> years ago I created a free server monitor. The monitor has always had
> ping checks, port checks, and http(s) checks. I was doing ping checks
> via the isReachable method. I have never had issues with the
> isReachable method until recently. By recently I mean late last
> summer, I began getting more and more complaints from users that ping
> is not working. I usually gave the canned response to ping not working
> because the ping portion of the application had been stable and
> working for about a year and a half.
>
> Now, as it turns out, I cannot get it to work.
>
> I am thinking I need to remove the "Ping" feature from my application.
> However, the backlash from users when a feature is removed is usually
> quick and severe. Even though the application is free I really want
> this to be a last resort. Is there an alternative to isReachable?
>
>
>
>
>
> On Dec 27, 11:54 am, Mark Murphy <mmur...@commonsware.com> wrote:
>> On Mon, Dec 27, 2010 at 12:46 PM, bc <clarkbrianc...@gmail.com> wrote:
>> > I am stumped. InetAdress.isReachable simply does not work. By that I
>> > mean, it always returns false for an external host.
>>
>> > I have tried searching the internet to see if anybody else is having
>> > the same problem, I have found a few people have had the same problem,
>> > but cannot really find an explanation why.
>>
>> > I have tried this on multiple devices with the same result.
>>
>> > boolean blnResult =
>> > InetAddress.getByName("localhost").isReachable(20000);
>>
>> > The above line of code works every time. If I change the "localhost"
>> > to an external host that I can verify "isReachable", the result is
>> > always false.
>>
>> > blnResult =
>> > InetAddress.getByName("www.google.com").isReachable(20000);
>> > blnResult = InetAddress.getByName("4.2.2.2").isReachable(20000);
>>
>> > The above lines always return false, even though I can use a terminal
>> > emulator on the same device and get a true result.
>>
>> > Can somebody more experienced with Android or perhaps a Google
>> > engineer please give a plausible explanation for this.
>>
>> http://stackoverflow.com/questions/2935325/android-debugging-inetaddr...
>>
>> isReachable() attempts to connect to port 7, which may be eaten by
>> firewalls. This is a legacy holdover from Java -- I would recommend
>> trying to do something more meaningful, like an HTTP GET request on a
>> known good URL if you are trying to see if a Web service is reachable.
>>
>> --
>> Mark Murphy (a Commons
>> Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
>>
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>
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