SonarLint "Connection refused" to SonarQube 6.7 - intellij-idea

Question

Since upgrading SonarQube from 6.6 to 6.7 I'm facing the Problem, that I can't connect SonarLint for IntelliJ with the SonarQube Server.
I need to configure a corporate proxy but the configuration worked with SonarQube 6.6 and hitting "Test Connection" also returns an OK.
The Error Message when configuring the Server is:
Failed to connect to the server. Please check the configuration. Error: Fail to request https://mysonardomain/sonar/api/system/status
Browsing the mentioned Page returns a valid Json Object:
{
"id": "xxxxxxxxxxxxxxx",
"version": "6.7.0.33306",
"status": "UP"
}
The Error Log shows:
Connection test failed
java.lang.IllegalStateException: Fail to request https://mysonardomain.com/sonar/api/system/status
at org.sonarsource.sonarlint.core.util.ws.HttpConnector.doCall(HttpConnector.java:179)
at org.sonarsource.sonarlint.core.util.ws.HttpConnector.get(HttpConnector.java:111)
at org.sonarsource.sonarlint.core.util.ws.HttpConnector.call(HttpConnector.java:100)
at org.sonarsource.sonarlint.core.container.connected.SonarLintWsClient.rawGet(SonarLintWsClient.java:114)
at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.fetchServerInfos(ServerVersionAndStatusChecker.java:97)
at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.checkVersionAndStatus(ServerVersionAndStatusChecker.java:61)
at org.sonarsource.sonarlint.core.container.connected.validate.ServerVersionAndStatusChecker.checkVersionAndStatus(ServerVersionAndStatusChecker.java:51)
at org.sonarsource.sonarlint.core.WsHelperImpl.validateConnection(WsHelperImpl.java:60)
at org.sonarsource.sonarlint.core.WsHelperImpl.validateConnection(WsHelperImpl.java:53)
at org.sonarlint.intellij.tasks.ConnectionTestTask.run(ConnectionTestTask.java:53)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:713)
at com.intellij.openapi.progress.impl.CoreProgressManager$5.run(CoreProgressManager.java:397)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:157)
at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:543)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:488)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:94)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
at com.intellij.openapi.application.impl.ApplicationImpl.a(ApplicationImpl.java:575)
at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:315)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Failed to connect to mysonardomain.com/10.1.1.10:443
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:223)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:147)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:192)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:121)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:100)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:185)
at okhttp3.RealCall.execute(RealCall.java:69)
at org.sonarsource.sonarlint.core.util.ws.HttpConnector.doCall(HttpConnector.java:176)
... 23 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at okhttp3.internal.platform.Platform.connectSocket(Platform.java:124)
at okhttp3.internal.connection.RealConnection.connectSocket(RealConnection.java:221)
... 41 more
The SSL Certificate is self signed but added to the JVM so IntelliJ is aware of it (and there is no SSLHandshakeException)
I'm using:
IntelliJ IDEA 2017.3.2 (Ultimate Edition)
SonarQube 6.7
SonarLint 3.1.0.2244
Has anyone else the same problem? Any Ideas? Any Information missing?
Thanks in Advance

Answer 1

I updated to SonarQube 6.7.1 a few days ago - this did not solve the problem.
Today I upgraded to IntelliJ IDEA 2017.3.3 - This fixed the problem
I don't know what exactly caused the problem but it's solved.

Answer 2

SonarQube refuses requests if the load is high.
SonarQube has some configuration in the sonar.properties.
You can refine there the maxThreads:
It depends on your usage, the default values are very small, we use this:
sonar.web.http.maxThreads=500
sonar.web.http.minThreads=100
sonar.web.http.acceptCount=500
where the load is coming?
Jenkins build jobs for example via maven plugin
IDE plugins for Visual Studio, Eclipse or ItelliJ connect to Sonar for profiles
BitBucket searching for branch analyze report
I would also recommand to update the Java options:
sonar.web.javaOpts=-Xmx2024m -Xms512m -XX:+HeapDumpOnOutOfMemoryError -server
SonarQube system admin page helps you to refine the values, because you see there the current usage.
/admin/system
Note: restart SonarQube service instead of using the restart button on admin page. Otherwise the new settings will be not used.