okhttp: ConnectException/ETIMEDOUT with retrofit/OkHttp

Related to square/retrofit#432, I’m getting some strange errors during requests.

Retrofit: 1.9.0 OkHttp: 2.2.0 and 2.4.0 Tested Android versions: 4.4.4, 5.0.2, 5.1 and 5.1.1

Stacktrace:

retrofit.RetrofitError: failed to connect to <myserver.local>/<ip address> (port 80): connect failed: ETIMEDOUT (Connection timed out)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:395)
    at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)
    at java.lang.reflect.Proxy.invoke(Proxy.java:397)
    at $Proxy1.getRaw(Unknown Source)
    <Internal code ommitted>
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
Caused by: java.net.ConnectException: failed to connect to <myserver.local>/<ip address> (port 80): connect failed: ETIMEDOUT (Connection timed out)
    at libcore.io.IoBridge.connect(IoBridge.java:124)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
    at java.net.Socket.connect(Socket.java:882)
    at com.squareup.okhttp.internal.Platform$Android.connectSocket(Platform.java:179)
    at com.squareup.okhttp.Connection.connect(Connection.java:155)
    at com.squareup.okhttp.Connection.connectAndSetOwner(Connection.java:174)
    at com.squareup.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:120)
    at com.squareup.okhttp.internal.http.RouteSelector.next(RouteSelector.java:131)
    at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:312)
    at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:235)
    at com.squareup.okhttp.Call.getResponse(Call.java:262)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:219)
    at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:192)
    at com.squareup.okhttp.Call.execute(Call.java:79)
    at retrofit.client.OkClient.execute(OkClient.java:53)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)
    ... 16 more
Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
    at libcore.io.Posix.connect(Native Method)
    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
    at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
    at libcore.io.IoBridge.connect(IoBridge.java:122)
    ... 32 more
java.net.ConnectException: failed to connect to <myserver.local>/<ip address> (port 80): connect failed: ETIMEDOUT (Connection timed out)
    at libcore.io.IoBridge.connect(IoBridge.java:124)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
    at java.net.Socket.connect(Socket.java:882)
    at com.squareup.okhttp.internal.Platform$Android.connectSocket(Platform.java:179)
    at com.squareup.okhttp.Connection.connect(Connection.java:155)
    at com.squareup.okhttp.Connection.connectAndSetOwner(Connection.java:174)
    at com.squareup.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:120)
    at com.squareup.okhttp.internal.http.RouteSelector.next(RouteSelector.java:131)
    at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:312)
    at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:235)
    at com.squareup.okhttp.Call.getResponse(Call.java:262)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:219)
    at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:192)
    at com.squareup.okhttp.Call.execute(Call.java:79)
    at retrofit.client.OkClient.execute(OkClient.java:53)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)
    at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)
    at java.lang.reflect.Proxy.invoke(Proxy.java:397)
    at $Proxy1.getRaw(Unknown Source)
    <Internal code ommitted>
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
Caused by: android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
    at libcore.io.Posix.connect(Native Method)
    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
    at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
    at libcore.io.IoBridge.connect(IoBridge.java:122)
    ... 32 more
android.system.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
    at libcore.io.Posix.connect(Native Method)
    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
    at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
    at libcore.io.IoBridge.connect(IoBridge.java:122)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
    at java.net.Socket.connect(Socket.java:882)
    at com.squareup.okhttp.internal.Platform$Android.connectSocket(Platform.java:179)
    at com.squareup.okhttp.Connection.connect(Connection.java:155)
    at com.squareup.okhttp.Connection.connectAndSetOwner(Connection.java:174)
    at com.squareup.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:120)
    at com.squareup.okhttp.internal.http.RouteSelector.next(RouteSelector.java:131)
    at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:312)
    at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:235)
    at com.squareup.okhttp.Call.getResponse(Call.java:262)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:219)
    at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:192)
    at com.squareup.okhttp.Call.execute(Call.java:79)
    at retrofit.client.OkClient.execute(OkClient.java:53)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)
    at retrofit.RestAdapter$RestHandler.invoke(RestAdapter.java:240)
    at java.lang.reflect.Proxy.invoke(Proxy.java:397)
    at $Proxy1.getRaw(Unknown Source)
    <Internal code ommitted>
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)

I read somewhere that OkHttp uses a pool of sockets to reduce the latency, and sometimes, these sockets simply “times out”. To avoid this (and considering my suspicious about AP router or server bottleneck), I’ve included a for loop to retry the request another 2 times after a ConnectException, but without any results.