java.net.UnknownHostException: Unable to resolve host "domain.com": No address associated with hostname

Question

Bumped into an issue where my application using https://github.com/square/okhttp - okhttp version - 3.12.1 is not able to connect to a domain even though I've provided the Internet Permission in the AndroidManifest.xml

The user was, however, able to connect to the internet on their device and use other apps, based on their review comments.

For now, I am unable to reproduce the exception and hence if anyone who has experienced this issue before could help me understand better.

I cannot upgrade the library at the moment as I don't want to introduce a big change.

Stacktrace

Caused by: java.net.UnknownHostException: Unable to resolve host "domain.com": No address associated with hostname
    at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:156)
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:103)
    at java.net.InetAddress.getAllByName(InetAddress.java:1152)
    at okhttp3.Dns$-CC.lambda$static$0(SourceFile:39)
    at okhttp3.-$$Lambda$Dns$mTkNcZf2K4euny3_jks6Cac6Az0.lookup(Unknown Source:0)
    at okhttp3.internal.connection.RouteSelector.resetNextInetSocketAddress(SourceFile:185)
    at okhttp3.internal.connection.RouteSelector.nextProxy(SourceFile:149)
    at okhttp3.internal.connection.RouteSelector.next(SourceFile:84)
    at okhttp3.internal.connection.StreamAllocation.findConnection(SourceFile:214)
    at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(SourceFile:135)
    at okhttp3.internal.connection.StreamAllocation.newStream(SourceFile:114)
    at okhttp3.internal.connection.ConnectInterceptor.intercept(SourceFile:42)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:121)
    at okhttp3.internal.cache.CacheInterceptor.intercept(SourceFile:94)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:121)
    at okhttp3.internal.http.BridgeInterceptor.intercept(SourceFile:93)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(SourceFile:125)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:121)
    at com.appdynamics.eumagent.runtime.a.a$a.intercept(SourceFile:108)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:121)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:147)
    at okhttp3.internal.http.RealInterceptorChain.proceed(SourceFile:121)
    at okhttp3.RealCall.getResponseWithInterceptorChain(SourceFile:264)
    at okhttp3.RealCall.execute(SourceFile:93)

Caused by: android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)
    at libcore.io.Linux.android_getaddrinfo(Native Method)
    at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
    at libcore.io.BlockGuardOs.android_getaddrinfo(BlockGuardOs.java:200)
    at libcore.io.ForwardingOs.android_getaddrinfo(ForwardingOs.java:74)
    at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:135)
    ... 39 more

On Windows: `ping domain.com -6` yields the same error. Not sure if your user needs an IPv6 address or not... — greeble31, Jan 14 '20 at 03:05
have you found the solution for this? if yes, please share I am facing the same issue. — Nirmal Shethwala, May 20 '21 at 21:13
Sometimes i've faced the issue if my domain was 'www.example.com', instead i usually add 'http://' infront of 'www.example.com' — tendai, Jul 08 '21 at 04:45

Sampa · Answer 1 · 2020-01-14T00:19:22.813

0

I usally have that error using Retrofit (with Okhttp as client), it happens when the device doesn't have any internet conection (both WIFI or mobile data) or my server endpoint is down. Try it yourself! But there are several factors else; like runtime request permisions or the network security config.

Hope this helps, bro.

edited Jan 14 '20 at 00:19

answered Jan 14 '20 at 00:08

Sampa

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2

the users affected by this issue state that they have an internet connection as they are able to use other apps. The server endpoint is also up and running with no errors hence iOS users are not affected. There are no network security config rules that are linked to the AndroidManifest. – scout Jan 14 '20 at 02:24
I am facing similar issue did you find any solution? – Kartik Garasia Sep 04 '22 at 13:05

score 0 · Answer 2 · answered Jan 16 '20 at 23:24

0

We solved this issue by making a few DNS changes.

Reduced few CNAME records.
Reduced TTL.

No code changes were made on the android client.

answered Jan 16 '20 at 23:24

scout

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score 0 · Answer 3 · answered Jun 12 '23 at 13:04

Based on the user's ISP it may occur, I think the best way to guarantee that the domain gets resolved is using a custom DNS Resolver using a Custom Caching mechanism based on the needs.
Sometimes ISPs/Routers cache the DNS response based on the first Query,
So most of the time you ask for the record from the primary DNS servers it works. Take a look at https://square.github.io/okhttp/4.x/okhttp/okhttp3/-dns/

score -1 · Answer 4 · answered Jun 11 '23 at 07:04

-1

I was facing a similar issue while using Volley in android. The issue got resolved after invalidating the cache and restarting the project.

In Android Studio, File -> Invalidate Caches -> Select all checkboxes -> Invalidate cache and Restart.

answered Jun 11 '23 at 07:04

HKST

1

the question is relation to user's device not the Android Studio itself. – Koorosh Ghorbani Jun 12 '23 at 13:05

java.net.UnknownHostException: Unable to resolve host "domain.com": No address associated with hostname

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