FAQ

[android-developers] Unable to resolve host "mysite.com" No address associated with hostname

John Merlino
Jan 7, 2013 at 10:58 pm
I have a site up and running and I can even connect to it with the
emulator, and up to an hour ago I was able to connect to it with the
android device as well. However, now I am suddenly getting this
message when trying to connect to a URL while testing on the device:

01-07 17:52:42.650: W/System.err(24859):
java.net.UnknownHostException: Unable to resolve host "mysite.com": No
address associated with hostname
01-07 17:52:42.650: W/System.err(24859): at
java.net.InetAddress.lookupHostByName(InetAddress.java:424)
01-07 17:52:42.650: W/System.err(24859): at
java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
01-07 17:52:42.650: W/System.err(24859): at
java.net.InetAddress.getAllByName(InetAddress.java:214)
01-07 17:52:42.650: W/System.err(24859): at
org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:
137)

I tried it with emulator again and emulator still is able to connect
to host, but the device keeps producing the above error.

thanks for response

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2 responses

  • Lew at Jan 8, 2013 at 1:03 am

    John Merlino wrote:

    I have a site up and running and I can even connect to it with the
    emulator, and up to an hour ago I was able to connect to it with the
    android device as well. However, now I am suddenly getting this
    message when trying to connect to a URL while testing on the device:

    01-07 17:52:42.650: W/System.err(24859):
    java.net.UnknownHostException: Unable to resolve host "mysite.com": No
    address associated with hostname
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.lookupHostByName(InetAddress.java:424)
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.getAllByName(InetAddress.java:214)
    01-07 17:52:42.650: W/System.err(24859): at
    org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:

    137)

    I tried it with emulator again and emulator still is able to connect
    to host, but the device keeps producing the above error.
    What changed an hour ago?

    You don't give a lot of information here. I'm guessing that the device is
    not connected to the private LAN that has
    the DNS server that resolves the hostname. The emulator shares the network
    connectivity of its host; not so the
    real device.

    You might have to (reverse) tether the device to get it to access the LAN.

    --
    Lew

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  • Robert Greenwalt at Jan 8, 2013 at 4:19 pm
    The error says that the dns server the device is talking to can't resolve
    the name. It may also mean we can't talk to the dns server. Can you
    resolve other names (google.com, cnn.com, etc)? Are you on wifi or mobile
    data? Are you talking to a public dns server? Is your server world
    accessible and has its dns record been published?

    If this is on a private network you should probably use wifi to give access
    to your private dns server and the server itself.

    R

    On Mon, Jan 7, 2013 at 5:02 PM, Lew wrote:

    John Merlino wrote:
    I have a site up and running and I can even connect to it with the
    emulator, and up to an hour ago I was able to connect to it with the
    android device as well. However, now I am suddenly getting this
    message when trying to connect to a URL while testing on the device:

    01-07 17:52:42.650: W/System.err(24859):
    java.net.UnknownHostException: Unable to resolve host "mysite.com": No
    address associated with hostname
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.**lookupHostByName(InetAddress.**java:424)
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.**getAllByNameImpl(InetAddress.**java:236)
    01-07 17:52:42.650: W/System.err(24859): at
    java.net.InetAddress.**getAllByName(InetAddress.java:**214)
    01-07 17:52:42.650: W/System.err(24859): at
    org.apache.http.impl.conn.**DefaultClientConnectionOperato**
    r.openConnection(**DefaultClientConnectionOperato**r.java:
    137)

    I tried it with emulator again and emulator still is able to connect
    to host, but the device keeps producing the above error.
    What changed an hour ago?

    You don't give a lot of information here. I'm guessing that the device is
    not connected to the private LAN that has
    the DNS server that resolves the hostname. The emulator shares the network
    connectivity of its host; not so the
    real device.

    You might have to (reverse) tether the device to get it to access the LAN.

    --
    Lew

    --
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    Groups "Android Developers" group.
    To post to this group, send email to android-developers@googlegroups.com
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    android-developers+unsubscribe@googlegroups.com
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    http://groups.google.com/group/android-developers?hl=en
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    android-developers+unsubscribe@googlegroups.com
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