using a proxy still requires local DNS resolution

[MichaelW-SD]

Expected behavior

Using a proxy in applilcationinsights.json should not require any local DNS resolution.

Actual behavior

If the agent is unable to resolve certain domains it fails to start. These domains include (maybe there are more)

• usgovarizona-0.in.applicationinsights.azure.us
• live.applicationinsights.us
• dc.services.visualstudio.com
• westus-0.in.applicationinsights.azure.com

If those domains can be resolved locally (for example with a hosts file), the agent starts up fine. This behavior was observed with AzureGovernment.

To Reproduce

• Deploy java agent into a java web application
• configure applicationinsights.json to use a proxy
• start the web application

System information

Please provide the following information:

• SDK Version: 3.2.4
• OS type and version: Linux, RH 7.9
• Application Server type and version (if applicable): Tomcat
• Using spring-boot? No
• Additional relevant libraries (with version, if applicable):

applicationinsights.json (in part)

{
  "connectionString": "InstrumentationKey=XXXX;EndpointSuffix=applicationinsights.us;IngestionEndpoint=https://usgovarizona-0.in.applicationinsights.azure.us/",
  "proxy": {
    "host": "your.corporate.proxy.com",
    "port": 31060
  },
  "role": {
    "name": "abc"
 },
}

Logs

2022-02-01 16:20:29.386-08:00 WARN c.m.a.a.i.i.AppIdSupplier$GetAppIdTask - Unable to retrieve appId: exception sending request to https://usgovarizona-0.in.applicationinsights.azure.us/api/profiles/XXXX/appId (future warnings will be aggregated and logged once every 5 minutes)
reactor.core.Exceptions$ReactiveException: java.net.UnknownHostException: usgovarizona-0.in.applicationinsights.azure.us: Name or service not known
at reactor.core.Exceptions.propagate(Exceptions.java:392)
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:97)
at reactor.core.publisher.Mono.block(Mono.java:1706)
at com.microsoft.applicationinsights.agent.internal.init.AppIdSupplier$GetAppIdTask.run(AppIdSupplier.java:126)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Suppressed: java.lang.Exception: #block terminated with an error
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:99)
... 9 common frames omitted
Caused by: java.net.UnknownHostException: usgovarizona-0.in.applicationinsights.azure.us: Name or service not known
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
at java.net.InetAddress.getAllByName(InetAddress.java:1193)
at java.net.InetAddress.getAllByName(InetAddress.java:1127)
at io.netty.util.internal.SocketUtils$9.run(SocketUtils.java:169)
at io.netty.util.internal.SocketUtils$9.run(SocketUtils.java:166)
at java.security.AccessController.doPrivileged(Native Method)
at io.netty.util.internal.SocketUtils.allAddressesByName(SocketUtils.java:166)
at io.netty.resolver.DefaultNameResolver.doResolveAll(DefaultNameResolver.java:50)
at io.netty.resolver.SimpleNameResolver.resolveAll(SimpleNameResolver.java:79)
at io.netty.resolver.SimpleNameResolver.resolveAll(SimpleNameResolver.java:71)
at io.netty.resolver.InetSocketAddressResolver.doResolveAll(InetSocketAddressResolver.java:73)
at io.netty.resolver.InetSocketAddressResolver.doResolveAll(InetSocketAddressResolver.java:31)
at io.netty.resolver.AbstractAddressResolver.resolveAll(AbstractAddressResolver.java:158)
at reactor.netty.transport.TransportConnector.doResolveAndConnect(TransportConnector.java:283)
at reactor.netty.transport.TransportConnector.lambda$connect$6(TransportConnector.java:110)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125)
at reactor.netty.transport.TransportConnector$MonoChannelPromise._subscribe(TransportConnector.java:579)
at reactor.netty.transport.TransportConnector$MonoChannelPromise.lambda$subscribe$0(TransportConnector.java:499)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 common frames omitted
2022-02-01 16:20:31.225-08:00 WARN c.m.a.a.i.q.QuickPulsePingSender - Pinging live metrics endpoint: java.net.UnknownHostException: live.applicationinsights.us (future warnings will be aggregated and logged once every 5 minutes)
reactor.core.Exceptions$ReactiveException: java.net.UnknownHostException: live.applicationinsights.us
at reactor.core.Exceptions.propagate(Exceptions.java:392)
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:97)
at reactor.core.publisher.Mono.block(Mono.java:1706)
at com.microsoft.applicationinsights.agent.internal.quickpulse.QuickPulsePingSender.ping(QuickPulsePingSender.java:116)
at com.microsoft.applicationinsights.agent.internal.quickpulse.QuickPulseCoordinator.ping(QuickPulseCoordinator.java:107)
at com.microsoft.applicationinsights.agent.internal.quickpulse.QuickPulseCoordinator.run(QuickPulseCoordinator.java:63)
at java.lang.Thread.run(Thread.java:748)
Suppressed: java.lang.Exception: #block terminated with an error
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:99)
... 5 common frames omitted
Caused by: java.net.UnknownHostException: live.applicationinsights.us
at java.net.InetAddress.getAllByName0(InetAddress.java:1281)
at java.net.InetAddress.getAllByName(InetAddress.java:1193)
at java.net.InetAddress.getAllByName(InetAddress.java:1127)
at io.netty.util.internal.SocketUtils$9.run(SocketUtils.java:169)
at io.netty.util.internal.SocketUtils$9.run(SocketUtils.java:166)
at java.security.AccessController.doPrivileged(Native Method)
at io.netty.util.internal.SocketUtils.allAddressesByName(SocketUtils.java:166)
at io.netty.resolver.DefaultNameResolver.doResolveAll(DefaultNameResolver.java:50)
at io.netty.resolver.SimpleNameResolver.resolveAll(SimpleNameResolver.java:79)
at io.netty.resolver.SimpleNameResolver.resolveAll(SimpleNameResolver.java:71)
at io.netty.resolver.InetSocketAddressResolver.doResolveAll(InetSocketAddressResolver.java:73)
at io.netty.resolver.InetSocketAddressResolver.doResolveAll(InetSocketAddressResolver.java:31)
at io.netty.resolver.AbstractAddressResolver.resolveAll(AbstractAddressResolver.java:158)
at reactor.netty.transport.TransportConnector.doResolveAndConnect(TransportConnector.java:283)
at reactor.netty.transport.TransportConnector.lambda$connect$6(TransportConnector.java:110)
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:125)
at reactor.netty.transport.TransportConnector$MonoChannelPromise._subscribe(TransportConnector.java:579)
at reactor.netty.transport.TransportConnector$MonoChannelPromise.lambda$subscribe$0(TransportConnector.java:499)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

[trask]

hi @MichaelW-SD, thanks for reporting this! it looks like this has been fixed in the azure sdk http client library that we use just recently: Azure/azure-sdk-for-java#26559.

I believe the next release of that library should be in the next couple of weeks, then we'll pull that in here to fix this.

[MichaelW-SD]

confirmed fixed in 3.2.6. Thanks.