[FCM] 푸시 발송 오류 원인 - Error getting access token for service account / Connection reset

증상

FCM Push 발송 시 아래와 같은 오류가 발생하면서 푸시발송이 정상적으로 되지 않았다.

(어쩔때는 정상적으로 되다가 안되다가 하는 증상)

원인

(나의 경우에는 코드에 문제가 없었지만)

회사의 네트워크에 보안설정에 의해 푸시 발송이 정상적으로 되지 않았다.

모바일 기기의 테더링으로 같은코드를 수행 시 정상적으로 푸시발송이 되는것을 확인 할 수 있었다.

com.google.firebase.messaging.FirebaseMessagingException: Unknown error while making a remote service call: Error getting access token for service account: java.net.SocketException: Connection reset

at com.google.firebase.messaging.FirebaseMessagingException.withMessagingErrorCode(FirebaseMessagingException.java:47)

at com.google.firebase.messaging.FirebaseMessagingClientImpl$MessagingErrorHandler.createException(FirebaseMessagingClientImpl.java:293)

at com.google.firebase.messaging.FirebaseMessagingClientImpl$MessagingErrorHandler.createException(FirebaseMessagingClientImpl.java:282)

at com.google.firebase.internal.AbstractHttpErrorHandler.handleIOException(AbstractHttpErrorHandler.java:63)

at com.google.firebase.internal.ErrorHandlingHttpClient.createHttpRequest(ErrorHandlingHttpClient.java:141)

at com.google.firebase.internal.ErrorHandlingHttpClient.send(ErrorHandlingHttpClient.java:92)

at com.google.firebase.internal.ErrorHandlingHttpClient.sendAndParse(ErrorHandlingHttpClient.java:72)

at com.google.firebase.messaging.FirebaseMessagingClientImpl.sendSingleRequest(FirebaseMessagingClientImpl.java:127)

at com.google.firebase.messaging.FirebaseMessagingClientImpl.send(FirebaseMessagingClientImpl.java:113)

at com.google.firebase.messaging.FirebaseMessaging$1.execute(FirebaseMessaging.java:135)

at com.google.firebase.messaging.FirebaseMessaging$1.execute(FirebaseMessaging.java:132)

at com.google.firebase.internal.CallableOperation.call(CallableOperation.java:36)

at com.google.firebase.messaging.FirebaseMessaging.send(FirebaseMessaging.java:102)

at com.google.firebase.messaging.FirebaseMessaging.send(FirebaseMessaging.java:86)

at kr.co._1004lucifer.util.FcmUtil.send(FcmUtil.java:47)

at kr.co._1004lucifer.util.FcmUtilTest.send(FcmUtilTest.java:43)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

Caused by: java.io.IOException: Error getting access token for service account: java.net.SocketException: Connection reset

at com.google.auth.oauth2.ServiceAccountCredentials.refreshAccessToken(ServiceAccountCredentials.java:444)

at com.google.auth.oauth2.OAuth2Credentials.refresh(OAuth2Credentials.java:157)

at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata(OAuth2Credentials.java:145)

at com.google.auth.oauth2.ServiceAccountCredentials.getRequestMetadata(ServiceAccountCredentials.java:603)

at com.google.auth.http.HttpCredentialsAdapter.initialize(HttpCredentialsAdapter.java:91)

at com.google.firebase.internal.FirebaseRequestInitializer.initialize(FirebaseRequestInitializer.java:55)

at com.google.api.client.http.HttpRequestFactory.buildRequest(HttpRequestFactory.java:88)

at com.google.firebase.internal.HttpRequestInfo.newHttpRequest(HttpRequestInfo.java:105)

at com.google.firebase.internal.ErrorHandlingHttpClient.createHttpRequest(ErrorHandlingHttpClient.java:137)

... 39 more

Caused by: javax.net.ssl.SSLException: java.net.SocketException: Connection reset

at sun.security.ssl.Alert.createSSLException(Alert.java:127)

at sun.security.ssl.TransportContext.fatal(TransportContext.java:353)

at sun.security.ssl.TransportContext.fatal(TransportContext.java:296)

at sun.security.ssl.TransportContext.fatal(TransportContext.java:291)

at sun.security.ssl.SSLTransport.decode(SSLTransport.java:141)

at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1279)

at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1188)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:401)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)

at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:587)

at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)

at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1340)

at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1315)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:264)

at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:113)

at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:84)

at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1012)

at com.google.auth.oauth2.ServiceAccountCredentials.refreshAccessToken(ServiceAccountCredentials.java:441)

... 47 more

Suppressed: java.net.SocketException: Connection reset by peer: socket write error

at java.net.SocketOutputStream.socketWrite0(Native Method)

at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)

at java.net.SocketOutputStream.write(SocketOutputStream.java:155)

at sun.security.ssl.SSLSocketOutputRecord.encodeAlert(SSLSocketOutputRecord.java:83)

at sun.security.ssl.TransportContext.fatal(TransportContext.java:384)

... 63 more

Caused by: java.net.SocketException: Connection reset

at java.net.SocketInputStream.read(SocketInputStream.java:210)

at java.net.SocketInputStream.read(SocketInputStream.java:141)

at sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:475)

at sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:469)

at sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:159)

at sun.security.ssl.SSLTransport.decode(SSLTransport.java:110)

... 60 more