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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